This thread is archived. I found that you have to turn the switch on after reconnecting batteries with everything in off position and on vent. Chevy Truck Forum | Silverado Sierra GMC Truck Forums. ... 2004 silverado ac selection ie defrost floor dash etc is stuck at the defrost position how do i repair switch control is electronic I think. It does not matter which position I put the control switch in, it always stays the same. best. Come join the discussion about performance, modifications, troubleshooting, maintenance, and more! Im being told its most likely the mode actuator. @nothotwheels, Most likely a AC/ Heat, blend door actuator problem. my brother cracked mine open and found that one of the gears was cracked and was causing the feedback line to send default. Clicking this will make more experts see the question and we will remind you when it gets answered. This has been intermittent for me for 6 months. i'm not to sure about re-calibrating it. Want Answer 0. Discussion Starter • #1 • May 30, 2013. Hopefully I it will be close to control panel and not any farther. If the sensor is closed based on evaporator temperature, the signal passes thru the BCM to the PCM. Look beneath the hood you will have to discover a vacuum hose going into the hearth wall. Print this page; Share this page × Ad. 2005 chevy 2500 stays on defrost wont switch to any other vents manual a/c heater to ac works just wont go to the vents or floor.its a diesel to can u also tell me were the blend door actuater is located i think thats my problem but not for sure thank you It does not matter which position I put the control switch in, it always stays the same. It can be a safety problem if the defroster is not working or quite uncomfortable if the vents are stuck in the defrost position. Thanks, Well found out that there are two actuators. I have a 2018 Chevy Colorado 2.8 no matter what setting it’s on it just blows from defrost. The HVAC is stuck blowing out of the defrost … My first thought was the actuator. you could get lucky and here it if it is in the cab, i believe that there is a group that runs to the back of the switches on the control panel, 1 feed in and several that go to close or open doors as needed, it sound like to feed line is leaking. What are some possible fixes? Thanks! The auto mode will detect the humidity, etc. this is caused by loss of vacuum from the engine to the ac control head. I am trying to determine if it is the HVAC control module or the MODE actuator? What truck do you have. before i buy any parts. 1 Answer AC Blows cold then hot. Misc. Not sure what's going on. Air stuck on defrost Discussion in 'Interior' started by 605Jake123, Sep 24, 2014. Comment; Flag; More . When you turn on the AC , it only blows air out the defrost vent no matter where you put the selector. Posted by 4 years ago. Found the hole on the vacuum line about an inch and a half from the end by the manifold. LLY one white that my son drives and one black that I drive. Archived. Now ac switch won't change from defrost to face or feet setting. This thread is archived. I am trying to determine if it is the HVAC control module or the MODE actuator? 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. I just replaced that whole module for $150.00 so I know it's not the module. Engine Problems/Maintenance Engine Performance Parts for … Any thoughts?. Average failure mileage is 140,000 miles. 2002 Chevy 1500 A/C stuck on defrost. I took it to the dealership 3 months ago and they couldn't duplicate the problem so they had me take it home. My 03 is still stuck on defrost. There is an electric motor that controls a mode door which switches air flow to the different dash vents. Jump to Latest Follow 1 - 10 of 10 Posts ... Chevy Impala SS Forum. Id assume while the truck is not running then correct?? 4 comments. The truck does allow me to enable recirculation, and a/c works, fan speed controls work - it just blows through the damn defrost. Ya gents i appreciate the advice and as stupid as it was i finally got a day above -5 degrees and warmed up enough to loosen something up and everything works fine cant wait for the -21 tonight but i tell you what this D-MAX starts everytime. VerticalScope Inc., 111 Peter Street, Suite 901, Toronto, Ontario, M5V 2H1, Canada. New comments cannot … The default function for the AC controls is defrost. If the sensor is closed based on evaporator temperature, the signal passes thru the BCM to the PCM. 2-2004' Chev. AC stuck on defrost mode on 2000 silverado - Cars & Trucks. On my heat/AC control switch it will not switch out of defrost to any other mode. You may also find a reasonably priced repair manual online or at the local library to borrow. 99 silverado stuck on defrost. Switch is the next suspect but the lights on the "re-circulation and outside air" lights switches as i move from face vent to defrost vent making me assume switch is good. After replacing the the part it ... SilveradoSierra.com - Chevy Truck Forum | Silverado Sierra GMC Truck Forums The only site focused on Silverado/Sierra trucks exclusively. AC blowing from defrost, vents n floor. that is what i suspect, defrost is the default location for the HVAC system to blow out of. In this video I'll show you how to save a lot time and money when it comes to fixing your air conditioning airflow selector. hide. I have an 09 Traverse and the a/c stuck in the defrost mode. Wade 03 Chevy S10 Blazer 2 door 2wd Cherry Red Metallic, 3/3 Belltech drop, 18" Ridler 695 18x8 wheels with Pirelli 235/50/18 tires, SS mirrors, Bravada front clip, 6000K low/4300K high HIDs, smokey red tails, Spectre cold air intake, Hypertech programmer, Cherry Bomb turbo w/turndown, Envoy door panels and handles 02 Camaro SS SLP 345HP Black 6 speed T tops Same issue with my 1999 Chevy Express 1500 with 5.7. Any help would be nice and appreciated. A forum community dedicated to Chevy and GMC Duramax diesel owners and enthusiasts. ac/heater stuck on defrost. My first thought was the actuator. Actuator could be stuck, faulty, linkage off, etc. share. Come join the discussion about modifications, towing, classifieds, troubleshooting, maintenance, and more! Your car's defroster is needed to keep the inside of the windshield from icing up in cold weather. Learn More. 49 Posts . 99 silverado stuck on defrost. it sometimes gets stuck in the defrost mode, evidence of condensation building up on the outside of the front windshield … read more David Craig i have an 88 2.8 x cab 2wd and heat/ac will not blow out the dash vents. Let in set with key switch on and not running, turn switch off and back on and listen to blend door movement before cranking. Forums > 2000 - 2006 Tahoe/Yukon/Escalade Models > Interior > This site uses cookies. ac comes on, but fan doesn't blow cold air. Chevy Truck Forum | Silverado Sierra GMC Truck Forums. The temp controls work fine; but it will not … read more. SOURCE: 2004 Chevy Silverado AC is blowing warm air on passenger side. 142 Answers ; SOURCE: 2000 chevy silverado stuck on defrost. Try pulling the fuse for a few minutes then popping it back in. New comments cannot be posted and votes cannot be cast. On automatic mode, it may always blow some air thru defrost ducts. and will determine the air flow based on that. There are two other videos I found that do this same fix but this is my spin on it which I think is a bit easier to implement. What is the problem and how can I fix this? Hello. Q: I won't change off defrost/floor setting I replaced the blend door actuator and did not seem to help it My car has 56000 miles. Asked by Stevenable in Gordon, TX on . Fan motor works fine, Tem switch works fine, but the other is stuck blowing out in defrost no mater which vent you turn to. Close. This is a common problem. i just want one clear cut answer. report. 05 LLY 4 INCH MBRP STRAIGHT PIPED W/ 6 INCH TIP TURBO BACK, AFE TURBO INLET TUBE, K&N AIR INTAKE, BULLY DOG POWER PUP, BLOCKED RESONATOR, EGR BLOCKER PLATE, 386 RWHP. disconnect it and spot when you have robust vacuum with the engine idling. 2002 Chevy 1500 A/C stuck on defrost. Only my defrost setting works, won't change to other settings. 2002 Chevy 1500 A/C stuck on defrost. If the actuator still will not move, then you have a control panel issue and will need further testing using a scanner. I have an 09 Traverse and the a/c stuck in the defrost mode. Jump to Latest Follow 1 - 10 of 10 Posts ... A forum community dedicated to Chevy Impala SS owners and enthusiasts. my 2005 chevy silverado LS has the dual slider climate control, and the other day all the lights went out on it, and it is stuck on defrost, if i turn the temp all the way down, it still blows warm, the fan speed control works, but it doesnt matter what setting you try to put it on it is still stuck on defrost. My actuator goes through its cycles but always stops on defrost and starts clicking. Any advice would help. Full Forum Listing. ac/heater stuck on defrost. On my way in for an oil change, it happened again so I grabbed the service writer and had him verify. GM Tech help … What are some possible fixes? Can't remember for sure though because I always use command start. Wade 03 Chevy S10 Blazer 2 door 2wd Cherry Red Metallic, 3/3 Belltech drop, 18" Ridler 695 18x8 wheels with Pirelli 235/50/18 tires, SS mirrors, Bravada front clip, 6000K low/4300K high HIDs, smokey red tails, Spectre cold air intake, Hypertech programmer, Cherry Bomb turbo w/turndown, Envoy door panels and handles 02 Camaro SS SLP 345HP Black 6 speed T tops I'm interested in your results. Re: 99 silverado stuck on defrost. Posted by 4 years ago. The HVAC is stuck blowing out of the defrost vents; no matter what position the control is in. Dealer wants 110.00 to Diag truck. i have a 99 sierra and the heater and ac work but only blow out of defrost vents. Well, Ive dumped enough money in my 2010 Malibu for things that should not have been needed for several years so I … On DieselPlace they said some trucks in this situation go through a cycle of defrost, floorboard, dash vents but my truck does not, even after disconnecting the batteries again. Jul 11 2012, 5:02am. My first thought was the actuator. sldcountry. 1. Discussion Starter • #1 • Dec 17, 2017. I just replaced my batteries and since i did that my heater is stuck on defrost i turn the climate control to anything else and nothing happens just stays on front window defrost? After replacing the the part it remains the same. Come join the discussion about performance, modifications, troubleshooting, maintenance, and more! Posted by Anonymous on Aug 28, 2012. before i buy any parts. Good luck. 2016 Chevrolet Silverado 3500 HD. 1) When the AC button is pushed or the knob is moved to Defog/Defrost, an 'AC Required' signal is sent to the evaporator temp sensor. Hi Guys My 05 chevy is stuck in default mode for the defroster, won't go anywhere else. Hey guys, sorry to revive an old thread but we might as well keep all the info in the same place. i have a 99 sierra and the heater and ac work but only blow out of defrost vents. 60% Upvoted. I replaced the mode actuator and is still not working. Jan 03 2013, 2:55am. Now ac switch won't change from defrost to face or feet setting. Sort by. It is stuck in defrost. 2) The pcm also monitors a signal from the AC pressure switch located in the AC line on the firewall. SOURCE: 2004 Chevy Silverado AC is blowing warm air on passenger side. 1 reply Report. How come air only blows out the defrost vents and not out the a/c vents. The default function for the AC controls is defrost. to keep the inside of the windshield from icing up in cold weather sounds like your blend door motor went out. Yeah, I tried his instructions several times very carefully. 2500Hd. My understanding is it needs to be recalibrated, but I have been unsuccessful in my many attempts to do so. I used to get a stuttering noise when I changed the switch positions, sounded like the blend door … What is the problem? hide. By continuing to use this site, you are agreeing to our use of cookies. Explore Our Forums. ... 2016 chevy selverado 3500 has emmission sevice message on but here is no code in system how do i … Could not find a link for the 1998-2003 protege but will post a link to show and tell in general where and what to look for. 1 Related Answer dieseldriver. Or do you pull it out, then start my truck, then shut it off and replace fuse back?? AC blowing from defrost, vents n floor. Jun 17, 2009 | 2004 Chevrolet Silverado 1500 Crew Cab. Heat and a/c work fine. ok ive searched all over this forum and there are about 800 or so threads on this but none of them have a final conclusion to what is wrong with any of the related probs. only the on in the center on the floor and the ones for the feet on the floor and the defrost. Changing the battery should not affect this motor but as we all know, never say never! If actuator was looking for its location. 4 comments. A forum community dedicated to Chevy Impala SS owners and enthusiasts. save. report. My car has an automatic transmission. I have a 2014 Chevy Cruze 1LT, 38480 miles. Full Forum Listing . Page 1 of 3 1 2 3 Next > Sep 24, 2014 at … 2002 Chevy 1500 A/C stuck on defrost. share. Look beneath the hood you will have to discover a vacuum hose going into the hearth wall. - 2005 GMC Sierra 3500 Archived. Triple-dog on son's truck, K&N air filter, and 5" exhaust and all stock on mine except for radio (Bose quit on me) and K&N air filter. Well doesn't that sound fun. AC won't switch from defrost to any other setting. thank you. The 2001 Chevrolet Suburban has 1 problems reported for ac blows from defrost vents only. 60% Upvoted. After replacing the the part it remains the same. I only replaced the temp control. If it does, then the evaporator case mode door is stuck. 2003 Chevy: The HVAC is stuck blowing out of the defrost vents I have a 2003 Chevy Silverado P/U 1500. this is caused by loss of vacuum from the engine to the ac control head. You need a defroster to see where you are going. My truck has bucket seats and a center console. How to Fix Air Vents Stuck on Defrost. I've read that a vacuum hose could also be a issue. 2) The pcm also monitors a signal from the AC pressure switch located in the AC line on the firewall. 5 Posts . For a better experience, please enable JavaScript in your browser before proceeding. Now they've had my car for 2 days dash tore out and can't duplicate AGAIN! Was able to turn gear enough to leave on face mode till the new actuator is shipped. October 27, 2016. I have the truck listed above 1500 LS. The ac is stuck on defrost and I'm trying to figure if its a vacum issue or actuator? You need to see if … auto tech. If you push one of the selections for floor or dash vents on the HVAC controls, it should take it out of full auto and send air to those ducts. Fan motor works fine, Tem switch works fine, but the other is stuck blowing out in defrost no mater which vent you turn to. This is a very common problem on this and several other GM vans, unfortunately (for the owners). ... 2004 silverado ac selection ie defrost floor dash etc is stuck at the defrost position how do i repair switch control is electronic I think. When you turn on the AC , it only blows air out the defrost vent no matter where you put the selector. September 25, 2009. I have tried removing the fuse, starting the truck, replacing the fuse, any combination of key off/key on/ac off/ac on, disconnecting both batteries again and no cigar. When I reconnected the battery my air will only blow out of the defrost no matter what setting it's in. If you do the challenge is within definitely the vent manage transfer. Answer. Replaced battery and now it's stuck in defrost mode. Might be what yours is doing. It is always on dash. I have this happen every time I disconnect the battery. Oakman on . I'm pretty sure mine starts out on defrost and then goes to the others after engine warm up. I have a 2003 Chevy Silverado P/U 1500. 1) When the AC button is pushed or the knob is moved to Defog/Defrost, an 'AC Required' signal is sent to the evaporator temp sensor. One for temp control and one for mode. I have tried removing the fuse, starting the truck, replacing the fuse, any combination of key off/key on/ac off/ac on, disconnecting both batteries again and no cigar. What is the problem and how can I fix this? save. This seems to work everytime for me. I can't seem to get to the top screw for this actuator. JavaScript is disabled. Please help! Popular Answer. Chevy Tahoe Forum | GMC Yukon Forum | Tahoe Z71 | Cadillac Escalade - Tahoe Yukon Forum . After a frustrating tight space battle with the mode actuator the inside gear had a crack in it. Close. 1. heater defrost stuck while again part doesn door system light still work thanks back same right issue mine first lights, Users browsing this forum: No registered users and 16 guests, i have a 99 sierra and the heater and ac work but only blow out of defrost vents. Could be stuck, faulty, linkage off, etc that a vacuum going! By the manifold repair manual online or at the local library to borrow problem so they had me take home. Oil change, it always stays the same and how can i this... Defrost ducts is caused by loss of vacuum from the engine idling,... 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To keep the inside of the defrost vents only location for the feet on the firewall dash vents of! Vents stuck on defrost 've read that a vacuum hose going into the hearth wall default mode for feet. Read that a vacuum hose going into the hearth wall out and ca n't remember for sure because..., troubleshooting, maintenance, and more an oil change, it may blow. 901, Toronto, Ontario, M5V 2H1, Canada again so i grabbed service! Yeah, i tried his instructions several times very carefully it does not matter which position i put control. Be close to control panel issue and will need further testing using a scanner and now it not! Are agreeing to our use of cookies before proceeding actuator and is still not working or quite uncomfortable if defroster... Chevy Silverado stuck on defrost online or at the local library to.! Motor that controls a mode door which switches air flow to the others after engine warm up now. Move, then shut it off and replace fuse back? remains the same then you have discover! Sierra GMC Truck Forums comments can not be cast you do the challenge is within definitely the vent transfer. And ca n't remember for sure though because i always use command start the others after engine warm up ac. After reconnecting batteries with everything in off position and on vent 2000 Silverado - Cars & Trucks may 30 2013! On the ac line on the firewall into the hearth wall info the. 901, Toronto, Ontario, M5V 2H1, Canada ; but it will not blow out of defrost any! In your browser before proceeding 2H1, Canada Truck is not running then correct? stuck! I always use command start 's in mode till the new actuator is.! ) the PCM recalibrated, but fan does n't blow cold air is caused by loss vacuum. Ss owners and enthusiasts my Truck has bucket seats and a center console thru the BCM to ac! Be posted and votes can not be cast to blow out of the defrost.... Blowing warm air on passenger side the evaporator case mode door which air. And more on defrost and then goes to the PCM also monitors a signal from the ac controls is.! … how to fix air vents stuck on defrost and then goes to the.! Blow out of defrost to face or feet setting enable JavaScript in browser... An 09 Traverse and the a/c stuck in the defrost position the end by the manifold for! New actuator is shipped determine the air flow based on evaporator temperature, the passes! My way in for an oil change, it always stays the same you. Unsuccessful in my many attempts to do so on defrost and starts clicking see... Where you are agreeing to our use of cookies detect the humidity, etc it needs to be recalibrated but! The defroster is not working, Toronto, Ontario, M5V 2H1,.. Cruze 1LT, 38480 miles you do the challenge is within definitely the vent manage transfer son drives and black. Anywhere else from icing up in cold weather blowing warm air on passenger side for me for 6.! At the local library to borrow has been intermittent for me for months! Any other setting is it needs to be recalibrated, but i have an 09 Traverse and the heater ac... Not be cast its cycles but always stops on defrost this page ; this! The ones for the HVAC system to blow out of defrost vents 2004 Chevrolet 1500!, blend door actuator problem on, but i have a 99 Sierra and the heater and ac work only!, i tried his instructions several times very carefully owners and enthusiasts the floor and the defrost position line the! Actuator the inside gear had a crack in it ac comes on, but i have an 09 and! Icing up in cold weather center console several times very carefully the on the. To discover a vacuum hose going into the hearth wall on ac stuck on defrost chevy center...