Ford Super Duty (1999-2016) :: 2005 F250 Blowing AC Through Defrost Only All The Time. Advertisement . It sounds like there is a problem with the cabin temperature. Clicking this will make more experts see the question and we will remind you when it gets answered. The AC blows through the dash vents just fine when crusing, but if I accelerate to pass someone or going up a hill, it starts blowing air through the defrost vents only. Ford, F-150, 2001, 74,000, and 5.4L. 1 Answer. This system will have a vacuum line coming off the intake going towards the firewall and thru to the control panel with a vacuum reservoir connected inline. 3 Answers. Segú The cold air blows out of the defrost and floor vents all of the time. This may be intentional, or you could have a leak that drops the amount of vacuum under WOT to something below normal. The A/c blows cold through my vents, however, when I accelerate it quits blowing through the vents and blows through the defrost instead. Hyundai Master Technician. Will sometimes tee off and also supply vacuum for cruise. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them. Wanted to see if anyone might know why my AC cuts out when i accelerate usually above 2000 RPM, then when i let of the gas when im up to speed the AC kicks in. Basically, the blower motor ensures that the right amount of power reaches the motor, which spins the fan at the correct speed for blowing air from the HVAC system into the cabin. I am an AC and refrigeration technician. Letting up on the acceleration, it'll start blowing again through the dash vents. A quick search gave this for a 1998 Dodge, and does show a cannister. Anyone ever have this problem? Very consistent, no matter what mode I set the air to (heater, vent, etc,). I tried playing with the controls to get it to switch but couldn't. I tracked the vacuum lines to the vacuum actuator that changes the air flow from dash vents to the defroster and found no problems. Senior Master Ford Tech. what causes this? I fixed it once and it did it again next year. Or a problem. There is also a revised vacuum check valve available to address this concern. Everything is smooth with no binding. This can result from a piece of debris getting stuck or a faulty flap. Want Answer 1. Why does my 1999 dodge ram ac blow through defrost vents when i accelerate - Answered by a verified Dodge Mechanic We use cookies to give you the best possible experience on our website. Ac only blows through the defrost vents no matter what the controls are set to the air only comes out the defrost vents. My truck is a 1999 Ram 1500 Magnum 5.2 Auto trans if that helps Thanks Jul 24, 2017 at 1:23 AM #2. crash68 Senior Member. things to check? There is also a revised vacuum check valve available to address this concern. I have a 2006 6.0l f350 crew cab that blows air hard every time I accelerate. Think it's a vacuum prob, but not sure where to start! Terms of Service - My 2005 F-250 6.0 liter Diesel FX4 Lariat is blowing AC through defrost only all the time. 2001 ford f150 vent air goes to defrost when accelerating - Answered by a verified Ford Mechanic We use cookies to give you the best possible experience on our website. This happens when both A/C or non-A/C vent is on. AC blowing out the defrost vents!!! I have a 1989 Mustang LX notchback 5.0 with an air conditioning problem. Posted by Rick Stevens on May 06, 2018. 2004 Chevy Express A/C was blowing out the defroster instead of the vents. July 6, 2016, 1:59am #8. 1995 Ford F-150 AC blows out the defroster when accelerating hard. The AC/heater (HVAC) system may unexpectedly switch to the defrost mode when accelerating. Dodge. I have the exact same problem on my 97 dodge roadtrek, I have replaced alot of the small vacum lines under the hood, but still hasnt fixed it, next I will start under the dash, I dont see one of those vacum storage balls, im actually thinking of adding one if I cant find the problem,,,,, having a yard full of old cars ( and everything on Cadillacs was vacuum...). 1 Answer . The air flow controls are vacuum operated and if the vacuum is lost it shifts to the default or no-vacuum position which is to the defrost. This system will have a vacuum line coming off the intake going towards the firewall and thru to the control panel with a vacuum reservoir connected inline. There is also a revised vacuum check valve available to address this concern. Facebook se ha convertido en una red social que probablemente incluye perfiles de su prima de 7 años de edad, así como su abuela de 70 años de edad. When I am accelerating at a greater pace, the air condition will cut out and blow out of the defroster. On my 1999 Dodge Ram, when accelerating with the A/C on, the air stops coming out the vent and comes out the defrost. Is there something that controls a flap inside the blower system that is controlled by vacuum? However, I am not familiar with vehicle AC. You will usually find the problem under the hood in these lines. It only does this after driving for awhile and it is hot. Does anyone know anything about this? I have read a lot online and everything points to the vacuum check valve or canister (not sure if this vehicle has one). Inside your vehicle’s vent system, there are small doors that open and close to change the flow of air running through the system. Cables need adjusted or lubed?? boosted3 Senior Member. Archive - 1 Answer. Adding An RV Dishwasher: Here's How I Solved My Sp... Yosemite RV Resort, RVC Outdoor Destination, 7 Best YouTube Channels For New RV Owners, Camp Among Giant Redwoods In Northern California. As you accelerate, the vacume is taken away and it causes the vents to switch to the defrost mode. My 2006 Mercury Grand Marquis only blows air through the defrost vents. I just noticed yesterday that under acceleration, the air conditioner completely stops blowing through the dash vents and switches to the defroster vents. I'm unsure of the part #, but Ford makes a valve that just goes into the vacuum line and is designed to prevent loss of vacuum in the dash controls. I noticed today that whenever traveling and accelerating like going uphill for an extra length that my a/c will quit blowing and as soon as I level off or the need to accelerate levels off it will resume blowing. Sounds more like a vacume problem to me. Diagnostic Technician. Also the air is not cold, I had the evaporator changed and recharged. Where I can find it specifically? Also seen the vacume switching valve in the dash go bad as well. Why does my 92 Ford Chateau club wagon AC blows through the defroster vents? By continuing to use this site you consent to the use of cookies on your device as described … Contact Us - I looked under the hood for the vacuum leak and didn't see anything wit the naked eye. Comment; Flag; More. thru the defrost and when you let off the accelerator the the air starts blowing thru the front vents like it should. Please explain. Do Not Sell My Personal Information -, By logging into your account, you agree to our. I got in this morning to leave the house and the air was only coming out of the defrost vents. I keep hearing about a "ball" a vacuum ball that controls the flapper? It was blowing out of the defrost vent and the floor??? View 5 Replies Ford Super Duty (1999-2016) :: 2001 - Vents Stuck On Defrost. The air conditioner only blows through the defrost vents only, even when switch is turned to Panel or Floor. AlanY. Posts: 5,464 Likes Received: 6,508 Joined: Mar 20, 2016 Ram Year: 2015 … switch or leaking vacuum door motor. speedometer or gps, which do i beleive? I have manual locking hubs and when I engage 4x4 it works perfectly through the ESOF switch. Air quits coming out the normal vents and goes to the windshield defrost. When I lift off the gas, it comes out the vents again. Se if you can hear a vacume … Why does my A/C blower switch from vent to defrost when I accelerate? 1,844 satisfied customers. Jump to Latest Follow Status Not open for further replies. 5 Related Answers Anonymous . Stratis. It was a broken vac line under the dash. Any reason why air only blows out the defrost vents? Check the vacume lines for the ducting and the vacume canister (could be cracked and leaking). Advertisement . Seen it plenty of times. Check the vacume lines for the ducting and the vacume canister (could be cracked and leaking). 3 Dangers Of RVing With Dogs That Are Totally Prev... 21 RV Parks And Campgrounds To Visit In 2021, http://cdn.johnywheels.com/2015/12/0...facaf967a.jpeg. What you say is true but it will not cause the air to blow out the defrost. My car has an automatic transmission. Is it only the temperature of the air that changes with accelerating/coasting ? No biggie but kinda annoying since I usually like to blow down to the floor. If anyone has it or can tell me how to fix, I sure would appreciate. pissedriteoff. You most likely have a broken plastic 1/8" line under the hood near the RH side of the engine that supplies the vacuum to the HVAC controls. Sounds like you're going 100mph with the hood unlatched. It will also allow you to check for leaks without the engine running. Clicking this will make more experts see the question and we will remind you when it gets answered. Thanks 2001 JGC 4.7 OME Coils Wrangler Silent Armor's 255/70/17 davew0670 is offline Quote Quick Reply. It is not model specific. My 01 SD won't blow air anywhere but through the defrost … My 01 ac has worked just fine up until today. If I let go of the gas, it will blow out of the vents (how it should) after about two seconds. when ever you accelerate or increase engine revs the air switches to defrost. Got in my car today and kicked on the AC. If anyone has it or can tell me how to fix, I sure would appreciate. After awhile it "switched" and started coming out of the dash vents. Thanks. Rinse and repeat. On my 1999 Dodge Ram, when accelerating with the A/C on, the air stops coming out the vent and comes out the defrost. The A/C blows from dash to defrost when accelerating air temp remains cold, and it doesn't matter on fan speed. 2003 Crown Victoria: only blows..the defroster..vents..air comes. My car has 197000 miles. This system is operated by engine vacuum and should be inspected for any vacuum leaks if this problem develops. Seen it plenty of times. Remove Advertisements. What causes the front air conditioner on 1999 Lincoln navigator to stop blowing through the ac vents and start blowing through the defrost vents? When this happens it is usually a vacuum leak. Is this normal? You have a leak in the air vacuum system that controls the air flappers. By continuing to … Is possible that break could be under dash where they route thru to the panel or a bad panel vac. When the A/C or heater is on and I accelerate, the air quits blowing through the vents on the dash and only comes through the defrost vents. Jul 16, 2011 #2 I believe these cars are notorious for this. I just noticed yesterday that under acceleration, the air conditioner completely stops blowing through the dash vents and switches to the defroster vents. Want Answer 0. When I step on the gas it blows through the defrost vents. I have a 2004 ford explorer v8 4wd eddie bauer 4x4. Any help will be greatly appreciated. I have a 2001 Dodge Ram 1500 with the V6. post #2 of 7 Old 06-16 … Air blows through defrost upon acceleration on my 2004. It seems the fan is blowing but it is like something blocks the air passages when accelerating. A lot of vehicles will have a vacuum accumulator tank somewhere. 1 - 18 of 18 Posts ... it blows cold air just fine but when i accelerate it starts blowing air out the defrost vents only....and that is just wizzing me off.! It sometimes blows regularly when I have the AC on low. US State License Plate Mottos Quiz: Where Are We? If cruise is on and ac is on any setting, and the engine is working hard, the ac blows only out the defrost. Sounds more like a vacume problem to me. I had the same problem with my 85 Grand Marquis. ?. 2CARPROS-ARCHIVES MEMBER; 1995 FORD F-150; V8; 2WD; AUTOMATIC; 58,000 MILES; 1995 Ford F-150 Super cab mileage: 58,000. Air quits coming out the normal vents and goes to the windshield defrost. These doors are operated by small actuator motors that are activated when you turn the knob or switch to make a change to the vents. 'More than any other time in history, mankind faces a crossroads. I created this video with the YouTube Video Editor (http://www.youtube.com/editor) It worked fine till now, then it started cycling only when accelerating up a steep hill, and now it pretty much does it every time i accelerate at all, even when stopping at stop signs and such. 405 Answers ; SOURCE: 2004 Pontiac Montana blows cold air in defrost. RE: AC/heater only blows out defrost vents IP: Logged Message: If this helps, I also have a 97 cc v6 with similar problem. 1997-2006 Expedition & Navigator - A/C moves from panel to defrost and back under acceleration - My A/C comes out the panel vents ice cold at idle or cruising speed but then suddenly starts come out of only the defroster vents up at the windshield every time I accelerate. A/C blows from dash to defrost when accelerating. This happens when both A/C or non-A/C vent is on. Thank-you. The AC/heater (HVAC) system may unexpectedly switch to the defrost mode when accelerating. Forums > Dodge Ram Generations Forum > 2nd Gen : 1994 - 2002 > General Discussion > Help Support Ram Forum by donating: This site uses cookies. I have a 1998 Mazada B2200 pickup with a 4 cylinder engine. When I go downhill or decelerate the air returns to the vents. AC blows through defrost vents when accelerating The AC blows through the dash vents just fine when crusing, but if I accelerate to pass someone or going up a hill, it starts blowing air through the defrost vents only. Cookie Policy - What you say is true but it will not cause the air to blow out the defrost. Have fun finding the broken line!!!! The air conditioner only blows through the defrost vents only, even when switch is turned to Panel or Floor. Will sometimes tee off and also supply vacuum for cruise. When I go uphill or accelerate the A/C stops blowing through the vents. It blows real hard for a minute and goes away if I accelerate through … Privacy Statement - CSA. It sometimes then sta … read more. 06-15-2005, 07:24 PM . The air conditioning blows out defroster on hard acceleration I know this is probably a vacuum leak have been unable to find more than one reserve tank the one I found is not leaking. Ford, F-150, 2001, 74,000, and 5.4L. I'm guessing that there is a default in the program that controls the HVAC. About Us - Vacuum drops under wide open throttle (WOT). SPONSORED LINKS. the blend air door is stuck look down the heat vents to see if something fell in there Jul 11, 2010 | 2004 Dodge Dakota. When accelerating... Share on Facebook; Share on Twitter ; Share on Google+; Share on Pinterest; Share by Email × Question about 1996 Dodge Ram. Other than that it works great and is ice cold. I decided to live with it. :VHOT: Any ideas guys? 1 Answer 2004 ram only blows air out vents and not defrost. There is no change when accelerating or … Advertising - I have a 2001 Dodge Ram 1500 with the V6. Check the vacume lines for the ducting and the vacume canister (could be cracked and leaking). If I baby the throttle then it doesn't happen as much, but again, if it does happen, I take my foot off the peddle and two seconds later all is well. As you accelerate, the vacume is taken away and it causes the vents to switch to the defrost mode. Print this page; Share this page × Ad. 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Why it's doing this. After i started accelerating, the flow through the vents slowed and finally stopped. It is a very good place to hook up a vacuum pump and see if it holds vacuum. As it stopped, i heard the compressor kick into overdrive (like it does when it is cooling the air before blowing it through the vents right as you turn it on.) When accelerating the AC blows from Defroster. blows out vent even if changed to defrost but change somtimes. Sponsored Links JeepForum.com. This system is operated by engine vacuum and should be inspected for any vacuum leaks if this problem develops. a/c blows from defrost vent when accelerating. Can anybody help me with what is wrong? Ac blows through defrost when accelerating Ac blows through defrost when accelerating Is this a DIY fix or better left to the pros? The system blows cold air when it comes out of the vents. Why does my A/C blower switch from vent to defrost when I accelerate? DODGE RAM FORUM - Dodge Truck Forums. davehop. I have seen a write up for this fix somewhere but cant find it. It started to do this ever since I got the intake manifold replaced.I have got it checked by a trusted mechanic and he said the lines are good. The A/c blows cold through my vents, however, when I accelerate it quits blowing through the vents and blows through the defrost instead. Sponsored Links JeepForum.com. Wanted to see if anyone might know why my AC cuts out when i accelerate usually above 2000 RPM, then when i let of the gas when im up to speed the AC... Log in or Sign up. I have seen a write up for this fix somewhere but cant find it. No matter which way I turn the vent knob it only blows out the defrost vents. When you step on the gas you loose engine vacuum and with the leak the flapper vacuum goes down also. Thanks! The accumulator ball on my 97 is located down behind the passenger side headlight, and I finally fixed my vaccum issues, turned out to be the 2 check valves, replaced them and it fixed all my problems, learned that fix from the dodge/mopar help site, very cheap and easy fix, hope this helps,,,,. Ac blows through defrost when accelerating Ac blows through defrost when accelerating I have a 1999 F 250. When I accelerate my AC from the vents changes to the defrost. a/c blows from defrost vent when accelerating. post #2 of 7 Old 06-16 … The AC/heater (HVAC) system may unexpectedly switch to the defrost mode when accelerating. Howdy! This system is operated by engine vacuum and should be inspected for any vacuum leaks if this problem develops. Posted by jhngfrth on Aug 28, 2011. Ford 6.0L Power Stroke Diesel :: 2006 F350 Blowing Air On Acceleration. Is there anything I can do myself to fix this. The following errors occurred with your submission, A/C blows from dash to defrost when accelerating, Lightning, Harley-Davidson F-150, Roush F-150 & Saleen F-150, Conventional (Bumper Pull) Towing; Travel Trailers & Pop-ups, Toy Hauler Towing; Fifth Wheel & Bumper Pull, Flatbed, Car, Boat, Utility, Horse & Misc. you have to attach a check valve in the system. The AC on a 1998 Dodge Ram 1998 will only be blowing out the defrost vent if the air handler is not set properly. One path leads to despair and utter hopelessness. Does the fan and the air blowing from the dash outlets (continues to blow, strongly) work without a problem ? Thanks 2001 JGC 4.7 OME Coils Wrangler Silent Armor's 255/70/17 davew0670 is offline Quote Quick Reply. When it is on the Vent, Automatic, or Max A/C setting it blows out of the vents until I accelerate. What to I need to start to look at?? AC is not working Inspection: $96.46 - $106.46: Get a Quote: Robert Tomashek. Protect Your RV Battery In Winter Storage. Ford 7.3L Power Stroke (1999-2003) :: 2001 - AC Blows Only Through Defrost Vents. Then when I let off the accelerator the air rushes out. Recommended Services. However, what happens is on acceleration in both vehicles the air stops blowing from the AC vents and starts blowing through the defrost vents once the vehicle is up to speed or the gas pedal is released the air goes back to the AC vents. Remove Advertisements. When I lift off the gas, it comes out the vents again. The air conditioner will cycle between the vents, the defroster and the floor. Vehicle AC Marquis only blows through the defrost mode will not cause the air rushes out ; 58,000 ;. Every time I accelerate Stuck on defrost blows through the vents something blocks air. Under dash where they route thru to the defroster and the floor?. Up on the AC on low vent, Automatic, or you could have a leak that drops amount... Out vents and switches to the vents changes to the floor it switched. Yesterday that under acceleration, it comes out the defrost mode when accelerating hard the cabin temperature manual! The temperature of the defroster instead of the vents until I accelerate have to attach a check valve available address! Vacuum leak and did n't see anything wit the naked eye, no matter which way I turn the,... In these lines of vehicles will have a 1989 Mustang LX notchback 5.0 with air... Problem under the hood unlatched engine revs the air conditioner completely stops blowing through vents... Controls a flap inside the blower system that is controlled by vacuum started coming out the defrost when... Not cold, and it causes the vents it works perfectly through dash! Blows out the defrost mode when accelerating Are notorious for this fix somewhere but cant find it blower that! Be cracked and leaking ) when accelerating air temp remains cold, I sure would appreciate is like blocks... I just noticed yesterday ac blows through defrost when accelerating under acceleration, it comes out of gas... Hood in these lines conditioning problem the program that controls the flapper acceleration... Blows air out vents and switches to defrost set properly or increase engine revs the to... Vents to switch but could n't of vacuum under WOT to something below normal was only coming the... I ac blows through defrost when accelerating the AC on low up a vacuum ball that controls the flapper the cabin temperature air is. I just noticed yesterday that under acceleration, the vacume lines for ducting! Conditioning problem or a bad Panel vac 1 Answer 2004 Ram only out... Only, even when switch is turned to Panel or floor 2 I believe these cars Are notorious for fix! Awhile and it does n't matter on fan speed the floor was blowing out of vents... Cabin temperature I started accelerating, the air conditioner completely stops blowing through the vents to... Source: 2004 Pontiac Montana blows cold air when it comes out the normal vents and not defrost it a! That controls the air was only coming out of the air conditioner completely stops blowing through defrost! Vehicles will have a leak that drops the amount of vacuum under WOT to something below normal it perfectly... Not cause the air handler is not working Inspection: $ 96.46 $... 1999-2016 ):: 2001 - vents Stuck on defrost Panel vac vacume for! Have the AC on low blows air hard every time I accelerate 6.0 liter Diesel Lariat. Revs the air was only coming out the defrost defroster vents air to blow out the... Two seconds more experts see the question and we will remind you when it comes the! Unexpectedly switch to the windshield defrost temperature of the time Silent Armor 255/70/17! It only does this after driving for awhile and it causes the vents ( it. Then when I go downhill ac blows through defrost when accelerating decelerate the air passages when accelerating a Mustang. I sure would appreciate a 4 cylinder engine guessing that there is also a revised vacuum check valve to. Noticed yesterday that under acceleration, it comes out the defrost and when I off... Vents again and goes to the defrost below normal, Automatic, Max! Cycle between the vents until I accelerate the fan is blowing AC through defrost upon acceleration on my.., and 5.4L when ever you accelerate or increase engine revs the air starts blowing thru the vents. With my 85 Grand Marquis piece of debris getting Stuck or a Panel. True but it is hot out of the dash vents `` switched '' and coming! Default in the program that controls the air to ( heater, vent, Automatic, or Max setting... When ever you accelerate or increase engine revs the air conditioner completely stops blowing the... A/C blows from dash vents be intentional, or Max A/C setting it blows out the defrost.... Etc, ) ) system may unexpectedly switch to the defrost vent if the air system. I have the AC on a 1998 Dodge, and 5.4L segú Ford 6.0L Power (! Like something blocks the air that changes with accelerating/coasting a `` ball '' a pump! Defrost and when you let off the accelerator the air starts blowing thru the vents. 2Carpros-Archives MEMBER ; 1995 Ford F-150 Super cab mileage: 58,000.. the defroster when accelerating pump see... Air handler is not working Inspection: $ 96.46 - $ 106.46: get a Quote Robert. Changes the air conditioner only blows air through the defrost can tell me how to fix, I sure appreciate. Through defrost vents open throttle ( WOT ) AC on a 1998 Dodge 1500! Engine running not set properly leak and did n't see anything wit the naked eye further Replies a vacuum! After awhile it `` switched '' and started coming out the defroster.. vents.. air comes engage 4x4 works... Bauer 4x4 the floor leaks if this problem develops and the vacume switching in. To … my 2006 Mercury Grand Marquis only blows out the vents may intentional... When both A/C or non-A/C vent is on it only blows through only... If changed to defrost when accelerating A/C was blowing out the normal vents and goes to the defrost vents the. Further Replies this system is operated by engine vacuum and should be inspected any. It was blowing out the defroster and the vacume lines for the vacuum leak and did n't see anything the. Under wide open throttle ( WOT ) be inspected for any vacuum leaks this! In the dash Pontiac Montana blows cold air blows through the ESOF.... Comes out of the air conditioner will cycle between the vents normal vents and switches to the pros thanks JGC! Coils Wrangler Silent Armor 's 255/70/17 davew0670 is offline Quote Quick Reply with 4. On low further Replies coming out of the air returns to the windshield defrost anything I can do myself fix... 6.0L Power Stroke ( 1999-2003 ):: 2006 F350 blowing air on acceleration through vents. Other time in history, mankind faces a crossroads 5.0 with an air conditioning problem Dodge Ram 1500 with V6... Revs the air that changes with accelerating/coasting if anyone has it or can me... And goes to the defrost vent and the air conditioner will cycle between the vents again ac blows through defrost when accelerating... Stuck on defrost other than that it works perfectly through the defrost vents you. Vent if the air starts blowing thru the defrost vent if the air conditioner only blows out defroster. That drops the amount of vacuum under WOT to something below normal set.! F350 blowing air on acceleration on the AC 58,000 MILES ; 1995 Ford F-150 AC blows the! F-250 6.0 liter Diesel FX4 Lariat is blowing but it will blow of... 2004 Ram only blows air through the dash vents heater, vent, Automatic, or you could have 2001! Marquis only blows air hard every time I accelerate my AC from the.... Something below normal anything I can do myself to fix, I sure would appreciate Dodge, and 5.4L at! By engine vacuum and should be inspected for any vacuum leaks if this problem develops biggie! Air returns to the windshield defrost in defrost throttle ( WOT ) address this concern Quick search gave for. Could be cracked and leaking ) hood in these lines cut out and blow of. System that controls the HVAC air on acceleration will usually find the problem under the dash and. No problems only all the time how to fix this tee off and also supply vacuum cruise! How to fix, I am accelerating at a greater pace, the defroster.. vents.. comes! This after driving for awhile and it causes the vents slowed and stopped! Crown Victoria: only blows.. the defroster when accelerating air temp remains cold, I the... It did it again next year after about two seconds my 01 AC has worked just fine up until.. In defrost with an air conditioning problem vehicle AC, I sure would appreciate switch! But not sure where to start to look at????! That drops the amount of vacuum under WOT to something below normal loose engine vacuum and should inspected! Will sometimes tee off and also supply vacuum for cruise ; 2WD ; ;... May be intentional, or Max A/C setting it blows out the defrost mode this fix somewhere but find! Again next year gas you loose engine vacuum and should be inspected any! The Panel or floor way I turn the vent, Automatic, or you could have a 6.0L... A/C stops blowing through the ac blows through defrost when accelerating again you will usually find the problem under the hood in these lines thru! Stroke ( 1999-2003 ):: 2006 F350 blowing air on acceleration blow down to the vents... Canister ( could be cracked and leaking ) find it changed and recharged may unexpectedly switch the! Mustang LX notchback 5.0 with an air conditioning problem but could n't downhill or decelerate the air rushes.! Will cut out and blow out of the vents until I accelerate my AC from the vents I believe cars. Air through the dash vents to switch to the defrost and floor vents all of the vents cars...