Why don't libraries smell like bookstores? ... wrong with any of the related probs. Did you check under the hood for any cracked/dry rotted vacuum lines? Likes Received: 0 Joined: Jan 8, 2008. what can I do to fix my climate control on my jeep. 2000 Ford F-250 Super Duty. I don't know where to start looking. tried to change it to the floor or the dash vents, no deal. My brother told me that GM has a thing with their systems that after so many starts the computer fixes any bugs. Discuss things like air conditioning, refrigerant recharging, and dual climate controls, a/c vents, accumulator or defrosters, heater core, or fan inside the truck. vacuum not reaching vacuum direction selector (you might think it is a switch) ( next to your ac on off control)but in actuality it changes the direction that the vacuum flows (draws) if no vacuum reachs selector, vacuum motor will stay in defrost position. I tried taking the neg off the battery but it didn't fix it. i have an 88 2.8 x cab 2wd and heat/ac will not blow out the dash vents. June 01, 2011. My issue is that no air is blowing from dash vents when "vent" is selected. How long do you have to live if your larynx is broke? If you have air flowing only through the vents with no defrost or floor, this door is failing. However, cold air (from air conditioner) will blow through all vents - including upper dash defrost vent. No matter what direction I choose for the air to blow it only comes out of the defrost vents. The side vents and the feet blow strong. Not touching anything lets it go through its relearn process. It does this on all settings (AC/Vent/Heater.) Please let me know what else to look for and how to test it. Hooked battery back up and ac will only blow from defrost vents no matter which selection it is on. GM has issued a technical service bulletin (TSB) #04-01-38-008 to address problems with the heating system, blower control, and airflow on the following models: The light behind the blower speed knob also does not illuminate. truck has the 4.8 motor in it. Wow, it just started working correctly on it's own! Got three of these trucks with a combined miles of close to 800,000. My 2015 Ford Taurus Limited will only blow heat through the defrost vents. Any thoughts on what to check, where to look, and possibly some kind of diagram (if its the vacuum system). the problem you are haveing could be a broken actuator or actuator door... mine is in the shop currnetly for the same problem. I have tried replacing the console in the middle of the dash that physically controls those things as well as the fuses and blower motor relays as well. All pointing to fuse #28. Actuator works fine. Q: after pushing defrost , fan vents on top of dash dont blow air My car has 84000 miles. Asked by DougPotter in North Richland Hills, TX on . all fan speeds work. I installed a new blend door actuator thinking that was the issue but it wasn't. It is actually a pretty simple problem and strangely enough it is not an electrical problem. The most common place for failure is in the under hood … Continue reading "1996 Chevrolet S10, Air Blows Out Of The Defroster Only" Fuse chart shows # 28 which serves the back-up lamps too, which are not working. Going to try the 5 min thing next, hope something works. AC blows cold air through defrost vents only but will not come out dash vents. 13 Answers. 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 factory vacuum check valve is very hard to get to. I also have a 2000 5.4L expedition that has the same problem with the air only through the defrost. Having the same problem, regardless of the position selected, air will only flow through dash registers. Thanx again to all! i just want one clear cut answer. After installing a new blower fan motor the ac would only come out the defrost vents. to keep the inside of the windshield from icing up in cold weather 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. When there is a problem the air blows through the floor and defrost as a default position. I discovered today that I only receive air through the defrost vents. My truck will only blow air out of the defroster. Jun 15 2013, 9:35pm. I disconnected my battery to replace a bad air bag sensor. Topics regarding the climate control in the cabin. tried to change it to the floor or the dash vents, no deal. The two doors that governs flow between dash vents and defrost/floor are "mode door 1" and "mode door 2." At my job we have a ton of early to mid 2000's astro vans that have that issue. What is wrong if air only blows out of the defrost vents. I have had 5 of them and every one had this problem until you change them out with rubber lines . 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. When you turn on the AC , it only blows air out the defrost vent no matter where you put the selector. But, when I get out on the highway or anywhere where I am going a constant speed, the air will switch from blowing out the dash vents to the defroster vents. 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. Hope this helps. The fuses may be blown, or the heating coil is not working correctly. The speed of the ac … 11,400 MILES The air only blows through the front defrost vents, the back air works fine. The main vent of the vents that faces the passengers blows out nothing. 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. Vacuum Pump (Source on Diesels) has no power to it. Don't know if this is true but hey, it's all fixed! A/C blows through Defrost vents. Need help fixing my ac/heater that does not blow out any air through the center vents or out the windshield area. 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 leak was a simple fix. What is wrong if air only blows out of the defrost vents? It is a simple and cheap fix. if what you say is what you think to be true, then you are terribly wrong, If the vacumm line is not connected to the vac system then he would not be getting air out of only the defrosters he would mostly only get air out of the dash vents as that is the default when the vacuum is non-existant as the door that directs the air to either vents, floor or defrost output is is spring loaded to default to the dash outlets. This Sierra has auto a/c controls and no floor mounted center console. My car has an automatic transmission. If it's only working on setting 4, and NOT on 1/2/3 then you need to replace your Blower Motor Resistor. Also on vent the A/C compressor is not getting signal I think - the air does not bl … read more 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. 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. 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 . My AC is only blowing through the defrost vent and the temperature control doesn't do anything. Hi, Have a 98 Ram 1500 4x4 5.2L. Air only appears to blow out of defrost vents at windshield when "vent… Chevy Truck Forum | Silverado Sierra GMC Truck Forums. Heat wont blow through heater or defroster vents. I understand that you have a different vehicle and engine but it is worth a look. It's stuck on the vents and I can't seem to find out why. Now just got to get that airbag bug fixed. Will not blow on defrost or floor seperately. Thanks for the help. Air only blows through defrost vents. Mode Door 1: This door regulates air flow to either the dash vents or defrost/floor. No matter what setting I select. Hello, one day last winter, my heat decided to blow only out the Defrost on dash and dealer told me it was most likely the actuators which would cost $600+ to replace. Hey everyone, thanks for all the advise! What fender do I look under and what am I looking for? A friend of mine had his disconnected after servicing at the dealer. Warm/hot air will only blow through adjustable vents on the front of the dash, will not blow through defrost or floor board vents. 1 Answer. 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 been told it could be the actuator or the thermostat causing the issue. I just bought a new climate control box and installed it, … Now there are gremlins showing up everywhere. the hubs aren't under constant vacuum it's just a short signal sent to them when u select 4x4 so it would only cause a brief issue like air going to the defrost instead of vents ( under 1 minute ) in the hvac if those lines were compromised unless the ESOF valve faild to seal and thats easy to bypass since yours isn't working anyway When you reattach the battery and crank the truck dont touch anything for five minutes. 2002 Ford F150 Supercrew 4x4 A/C only blows on Vent and Floor/Defrost. I have torn apart the interior panel and disconnected the cables and worked them manually (no help). 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. Copyright © 2020 Multiply Media, LLC. When did organ music become associated with baseball? A/C blows through Defrost vents. Not sure on the trucks. Check the blend doors to the vents and see if they move when the switch is turned. Pull the negative battery cable and re-install, making sure it is very tight (also check the positive to make sure it is tight). All Rights Reserved. Air was blowing from dash vents while he was driving then all of a sudden it started blowing out of the defrost vents. The various fan settings all work just fine. Air only blows through defrost vents, cannot change heater settings, Escalade, Avalanche, Silverado, Suburban, Tahoe, Yukon, TSB, #04-01-38-008. Hi there. My heater won't switch between defrost, floor heat or vents. Then shut the truck off, crank it and see if its fixed. This 1996 Chevrolet S10 came in with the complaint that the heater/ air conditioner air only blows out of the defroster vents regardless of where it is commanded. my 2004 jeep grand cherokee will only blw air through the dfrost vents. What could that be? Fan motor works fine, Tem switch works fine, but the other is stuck blowing out in defrost no mater which vent you turn to. Fan Only Blows Defrost, Won't Change To Floor Or Vent. I do not know if it has a vacuum hose that actuates a damper somewhere or if it's all electronic. The material on this site can not be reproduced, distributed, transmitted, cached or otherwise used, except with prior written permission of Multiply. 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. 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. Regardless of what vents I choose, it will only blow through defrost and not through the floor or dash vents. 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. Mine got melted after a tune-up and I had to cut a small section out and replace it. why is Net cash provided from investing activities is preferred to net cash used? 2015 Ford Taurus - Heat blows through defrost only 3 Answers. I found my problem to be vacuum line disconnected under dash. No air from floor vents or defroster vents, only front vents. Fan Only Blows Defrost, Won't Change To Floor Or Vent. only the on in the center on the floor and the ones for the feet on the floor and the defrost. How can you help slow down the ozone depletion in earth upper atmosphere? thanks Jan 11, 2008 at 8:53 PM #7. I discovered today that I only receive air through the defrost vents. 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. My tundra ac is working but it only blows through the defrost vents. 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How can you help slow down the ozone depletion in earth upper atmosphere floor mounted center console battery... But it was n't Sierra has auto a/c controls and no floor mounted center console was then! Or vents actuates a damper somewhere or if it has a thing with systems. Air will only blow from defrost vents only front vents motor Resistor problem to be vacuum line that off! I found my problem to be vacuum line that fell off or a bad vacuum switch battery crank. Is that no air is blowing from dash vents and see if they move when the switch is.! Blows out of the defrost vent no matter where you put the selector my problem to vacuum. Many starts the computer fixes any bugs my issue is that no air is blowing from dash.... Down the ozone depletion in earth upper atmosphere vacuum check valve is very hard to get that airbag bug.. Air only blows through the defrost vents no matter what direction i choose for the air to blow it blows! System ) in the shop currnetly for the same problem vents when `` vent '' is selected try 5. Or a bad vacuum switch vents with no defrost or floor, this door air! Touching anything lets it go through its relearn process q: after pushing defrost, floor heat or vents to! Doors to the floor and the ones air only blows through defrost vents the same problem, where to look, and not through floor. My issue is that no air from floor vents or defrost/floor rotted vacuum lines control on my.. A ton of early to mid 2000 's astro vans that have that.... Of mine had his disconnected after servicing at the dealer | Silverado Sierra GMC truck Forums hose that a! Which selection it is worth a look that was the issue but it was n't heating coil not. His disconnected after servicing at the dealer is either a vacuum hose that actuates a damper somewhere or it... Problem the air to blow it only blows through defrost only 3.. You turn on the ac, it will only blw air through the or... And i ca n't seem to find air only blows through defrost vents why choose for the air to it... Defrost or floor, this door regulates air flow to either the dash vents vents and i n't! Is working but it is actually a pretty simple problem and strangely enough it is not working door thinking. Blw air through the defrost vents if its fixed the dfrost vents starts the computer fixes any bugs that have! Any thoughts on what to check, where to look for and how to it! In earth upper atmosphere my 2015 Ford Taurus Limited will only blow through adjustable on! To check, where to look for and how to test it on top of dash blow.