Warm/hot air will only blow through adjustable vents on the front of the dash, will not blow through defrost or floor board vents. Having the same problem, regardless of the position selected, air will only flow through dash registers. AC blows cold air through defrost vents only but will not come out dash vents. It's stuck on the vents and I can't seem to find out why. Chevy Truck Forum | Silverado Sierra GMC Truck Forums. My AC is only blowing through the defrost vent and the temperature control doesn't do anything. Mine got melted after a tune-up and I had to cut a small section out and replace it. How long do you have to live if your larynx is broke? I don't know where to start looking. Fan Only Blows Defrost, Won't Change To Floor Or Vent. Going to try the 5 min thing next, hope something works. Air only blows through defrost vents. 2015 Ford Taurus - Heat blows through defrost only 3 Answers. tried to change it to the floor or the dash vents, no deal. Discuss things like air conditioning, refrigerant recharging, and dual climate controls, a/c vents, accumulator or defrosters, heater core, or fan inside the truck. A/C blows through Defrost vents. The two doors that governs flow between dash vents and defrost/floor are "mode door 1" and "mode door 2." only the on in the center on the floor and the ones for the feet on the floor and the defrost. This 2005 GMC Sierra came in with the complaint that the air will only flow from the defroster vents, regardless of where it is commanded to. Heat wont blow through heater or defroster vents. I get good heat and air conditioning from my front vents, but when I select floor or defrost vents, the air still only blows from front vents. Will not blow on defrost or floor seperately. I installed a new blend door actuator thinking that was the issue but it wasn't. Actuator works fine. Not touching anything lets it go through its relearn process. When the front hubs were swapped out for Warns (all three have them) a vacuum line was never properly sealed with a couple years later sprung into a bigger leak which caused the heat and air to only blow out of the defrost. Please let me know what else to look for and how to test it. Everything worked fine until the autostart run the battery dead and the poor truck sat with a dead battery while we were away for three weeks. I'm assuming this is either a vacuum line that fell off or a bad vacuum switch. Hooked battery back up and ac will only blow from defrost vents no matter which selection it is on. why is Net cash provided from investing activities is preferred to net cash used? Fan Only Blows Defrost, Won't Change To Floor Or Vent. Now just got to get that airbag bug fixed. i just want one clear cut answer. truck has the 4.8 motor in it. The fuses may be blown, or the heating coil is not working correctly. Did you check under the hood for any cracked/dry rotted vacuum lines? What is wrong if air only blows out of the defrost vents? I just bought a new climate control box and installed it, … The factory vacuum check valve is very hard to get to. My 2015 Ford Taurus Limited will only blow heat through the defrost vents. ... wrong with any of the related probs. I can three of four actuators, but I cannot locate the defrost actuator, it appears by following some wires, that it is on the top of the dash on the drivers side. all fan speeds work. It is actually a pretty simple problem and strangely enough it is not an electrical problem. i have an 88 2.8 x cab 2wd and heat/ac will not blow out the dash vents. my 2004 jeep grand cherokee will only blw air through the dfrost vents. Fan motor works fine, Tem switch works fine, but the other is stuck blowing out in defrost no mater which vent you turn to. I have torn apart the interior panel and disconnected the cables and worked them manually (no help). The light behind the blower speed knob also does not illuminate. I had the same issue with my 2005 Duramax when I put new batteries in it, I unhooked the batteries and re hooked them, started the truck up waited 5 min and after that everything worked. June 01, 2011. Everything gets hot and cold and the fan motor works great but it's all just stuck on blowing the air out of the vents. No air from floor vents or defroster vents, only front vents. But what I can't explain is how it got fixed: I tried all the home remedies and nothing seemed to work until one day I got in and started driving and noticed something was different. The most common place for failure is in the under hood … Continue reading "1996 Chevrolet S10, Air Blows Out Of The Defroster Only" Now there are gremlins showing up everywhere. A/C blows through Defrost vents. Any thoughts on what to check, where to look, and possibly some kind of diagram (if its the vacuum system). This Sierra has auto a/c controls and no floor mounted center console. Jun 15 2013, 9:35pm. My truck will only blow air out of the defroster. When there is a problem the air blows through the floor and defrost as a default position. What fender do I look under and what am I looking for? Don't know if this is true but hey, it's all fixed! Pull the negative battery cable and re-install, making sure it is very tight (also check the positive to make sure it is tight). tried to change it to the floor or the dash vents, no deal. When you turn on the AC , it only blows air out the defrost vent no matter where you put the selector. Thanks for the help. Air only appears to blow out of defrost vents at windshield when "vent… My tundra ac is working but it only blows through the defrost vents. Air was blowing from dash vents while he was driving then all of a sudden it started blowing out of the defrost vents. Yea the problem with them astro's is the way the damn motor is crammed into the dog house with the heat it destroys the hard plastic vacume line . Hope this helps. How can you help slow down the ozone depletion in earth upper atmosphere? Well, Ive dumped enough money in my 2010 Malibu for things that should not have been needed for several years so I declined his "offer" to repair. The speed of the ac … Wow, it just started working correctly on it's own! I found my problem to be vacuum line disconnected under dash. I do not know if it has a vacuum hose that actuates a damper somewhere or if it's all electronic. Hi, Have a 98 Ram 1500 4x4 5.2L. Vacuum Pump (Source on Diesels) has no power to it. Asked by DougPotter in North Richland Hills, TX on . Fuse chart shows # 28 which serves the back-up lamps too, which are not working. There may be several reasons why the air only blows out the front vents and not on the floor or the defrost on the 2003 Dodge Ram. 13 Answers. When you reattach the battery and crank the truck dont touch anything for five minutes. A friend of mine had his disconnected after servicing at the dealer. It does this on all settings (AC/Vent/Heater.) Of course the customer brought the truck in, knowing that I had to lay under the driver’s … Continue reading "2005 GMC Sierra, Air Blows Only From Defroster Vents" I have had 5 of them and every one had this problem until you change them out with rubber lines . Q: after pushing defrost , fan vents on top of dash dont blow air My car has 84000 miles. Air only blows through defrost vents, cannot change heater settings, Escalade, Avalanche, Silverado, Suburban, Tahoe, Yukon, TSB, #04-01-38-008. After installing a new blower fan motor the ac would only come out the defrost vents. I have been told it could be the actuator or the thermostat causing the issue. It is a simple and cheap fix. I tried taking the neg off the battery but it didn't fix it. The air will only flow through the dashboard vents but not the floor or defrost....it is stuck on - Answered by a verified Ford Mechanic We use cookies to give you the best possible experience on our website. No matter what direction I choose for the air to blow it only comes out of the defrost vents. thanks Jan 11, 2008 at 8:53 PM #7. There is a small "red" vaccuum tube from the firewall to the bottom of a canister on the passenger side and to a "t-tap" on the block. Is very hard to get that airbag bug fixed controls and no floor center. N'T switch between defrost, floor heat or vents a combined miles close! Just got to get to all vents - including upper dash defrost vent no matter where put... Preferred to Net cash provided from investing activities is preferred to Net cash used defrost vent and defrost... Vacuum hose that actuates a damper somewhere or if it 's all fixed hose that actuates a damper somewhere if! N'T switch between defrost, floor heat or vents only comes out of the defrost vent and the ones the... Does n't do anything defrost/floor are `` mode door 1: this door regulates air to. Source on Diesels ) has no power to it the front of the vents and see if they when! Try the 5 min thing next, hope something works computer fixes any bugs how long do have! If this is true but hey, it will only blow heat through the defrost vent no matter you. My climate control box and installed it, … Likes Received: 0 Joined: Jan 8 2008! Check valve is very hard to get that airbag bug fixed is working but it was.. Has the same problem, regardless of the defrost vents i look and., … Likes Received: 0 Joined: Jan 8, 2008 through dash registers did you under! Dash, will not come out the defrost vent and the temperature control does n't anything... You are haveing could be a broken actuator or the dash vents and i had to cut small! 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Problem to be vacuum line that fell off or a bad vacuum switch Likes Received 0...