For a better experience, please enable JavaScript in your browser before proceeding. On my way in for an oil change, it happened again so I grabbed the service writer and had him verify. 99 silverado stuck on defrost. Comment; Flag; More . What is the problem? Jump to Latest Follow 1 - 10 of 10 Posts ... A forum community dedicated to Chevy Impala SS owners and enthusiasts. 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. ... 2016 chevy selverado 3500 has emmission sevice message on but here is no code in system how do i … Any help would be nice and appreciated. Fan motor works fine, Tem switch works fine, but the other is stuck blowing out in defrost no mater which vent you turn to. Re: 99 silverado stuck on defrost. Posted by Anonymous on Aug 28, 2012. Good luck. Explore Our Forums. Page 1 of 3 1 2 3 Next > Sep 24, 2014 at … save. ... 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. that is what i suspect, defrost is the default location for the HVAC system to blow out of. Yeah, I tried his instructions several times very carefully. report. Look beneath the hood you will have to discover a vacuum hose going into the hearth wall. I used to get a stuttering noise when I changed the switch positions, sounded like the blend door … Answer. What are some possible fixes? 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. When you turn on the AC , it only blows air out the defrost vent no matter where you put the selector. 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. save. October 27, 2016. Chevy Truck Forum | Silverado Sierra GMC Truck Forums. GM Tech help … My 03 is still stuck on defrost. Now ac switch won't change from defrost to face or feet setting. Jump to Latest Follow 1 - 10 of 10 Posts ... Chevy Impala SS Forum. this is caused by loss of vacuum from the engine to the ac control head. Misc. I just replaced that whole module for $150.00 so I know it's not the module. Your car's defroster is needed to keep the inside of the windshield from icing up in cold weather. share. i'm not to sure about re-calibrating it. Popular Answer. only the on in the center on the floor and the ones for the feet on the floor and the defrost. Come join the discussion about performance, modifications, troubleshooting, maintenance, and more! sounds like your blend door motor went out. hide. Any advice would help. 99 silverado stuck on defrost. New comments cannot be posted and votes cannot be cast. How come air only blows out the defrost vents and not out the a/c vents. sldcountry. LLY one white that my son drives and one black that I drive. 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. This thread is archived. This seems to work everytime for me. before i buy any parts. The HVAC is stuck blowing out of the defrost … Any thoughts?. AC won't switch from defrost to any other setting. 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 2002 Chevy 1500 A/C stuck on defrost. If it does, then the evaporator case mode door is stuck. I've read that a vacuum hose could also be a issue. After a frustrating tight space battle with the mode actuator the inside gear had a crack in it. i have an 88 2.8 x cab 2wd and heat/ac will not blow out the dash vents. New comments cannot … The truck does allow me to enable recirculation, and a/c works, fan speed controls work - it just blows through the damn defrost. thank you. This is a very common problem on this and several other GM vans, unfortunately (for the owners). Found the hole on the vacuum line about an inch and a half from the end by the manifold. AC blowing from defrost, vents n floor. 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 ac comes on, but fan doesn't blow cold air. Clicking this will make more experts see the question and we will remind you when it gets answered. Was able to turn gear enough to leave on face mode till the new actuator is shipped. I only replaced the temp control. Jul 11 2012, 5:02am. 5 Posts . I have this happen every time I disconnect the battery. Close. Close. Im being told its most likely the mode actuator. Engine Problems/Maintenance Engine Performance Parts for … Jan 03 2013, 2:55am. Chevy Truck Forum | Silverado Sierra GMC Truck Forums. Discussion Starter • #1 • May 30, 2013. If the sensor is closed based on evaporator temperature, the signal passes thru the BCM to the PCM. Posted by 4 years ago. 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. I took it to the dealership 3 months ago and they couldn't duplicate the problem so they had me take it home. AC blowing from defrost, vents n floor. My truck has bucket seats and a center console. Jun 17, 2009 | 2004 Chevrolet Silverado 1500 Crew Cab. Well doesn't that sound fun. You may also find a reasonably priced repair manual online or at the local library to borrow. My understanding is it needs to be recalibrated, but I have been unsuccessful in my many attempts to do so. You need a defroster to see where you are going. auto tech. It can be a safety problem if the defroster is not working or quite uncomfortable if the vents are stuck in the defrost position. I am trying to determine if it is the HVAC control module or the MODE actuator? Average failure mileage is 140,000 miles. Print this page; Share this page × Ad. it sometimes gets stuck in the defrost mode, evidence of condensation building up on the outside of the front windshield … read more David Craig My first thought was the actuator. Archived. 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. 1. The temp controls work fine; but it will not … read more. i have a 99 sierra and the heater and ac work but only blow out of defrost vents. Learn More. 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. Might be what yours is doing. Full Forum Listing. - 2005 GMC Sierra 3500 4 comments. If actuator was looking for its location. I'm pretty sure mine starts out on defrost and then goes to the others after engine warm up. Actuator could be stuck, faulty, linkage off, etc. 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 remains the same. Dealer wants 110.00 to Diag truck. After replacing the the part it remains the same. ... 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. Replaced battery and now it's stuck in defrost mode. It does not matter which position I put the control switch in, it always stays the same. Sort by. 60% Upvoted. Same issue with my 1999 Chevy Express 1500 with 5.7. I have the truck listed above 1500 LS. AC stuck on defrost mode on 2000 silverado - Cars & Trucks. 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. I have an 09 Traverse and the a/c stuck in the defrost mode. I can't seem to get to the top screw for this actuator. VerticalScope Inc., 111 Peter Street, Suite 901, Toronto, Ontario, M5V 2H1, Canada. Well, Ive dumped enough money in my 2010 Malibu for things that should not have been needed for several years so I … Posted by 4 years ago. I have a 2014 Chevy Cruze 1LT, 38480 miles. My first thought was the actuator. 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 car has an automatic transmission. The ac is stuck on defrost and I'm trying to figure if its a vacum issue or actuator? The 2001 Chevrolet Suburban has 1 problems reported for ac blows from defrost vents only. 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. Hi Guys My 05 chevy is stuck in default mode for the defroster, won't go anywhere else. 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 On my heat/AC control switch it will not switch out of defrost to any other mode. Asked by Stevenable in Gordon, TX on . Can't remember for sure though because I always use command start. 142 Answers ; SOURCE: 2000 chevy silverado stuck on defrost. I have an 09 Traverse and the a/c stuck in the defrost mode. i just want one clear cut answer. Forums > 2000 - 2006 Tahoe/Yukon/Escalade Models > Interior > This site uses cookies. Discussion Starter • #1 • Dec 17, 2017. i have a 99 sierra and the heater and ac work but only blow out of defrost vents. Or do you pull it out, then start my truck, then shut it off and replace fuse back?? If the sensor is closed based on evaporator temperature, the signal passes thru the BCM to the PCM. 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. My actuator goes through its cycles but always stops on defrost and starts clicking. Let in set with key switch on and not running, turn switch off and back on and listen to blend door movement before cranking. Thanks, Well found out that there are two actuators. JavaScript is disabled. Please help! Id assume while the truck is not running then correct?? SOURCE: 2004 Chevy Silverado AC is blowing warm air on passenger side. 49 Posts . Now they've had my car for 2 days dash tore out and can't duplicate AGAIN! 2016 Chevrolet Silverado 3500 HD. Oakman on . The auto mode will detect the humidity, etc. 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. Hey guys, sorry to revive an old thread but we might as well keep all the info in the same place. report. 1 Related Answer dieseldriver. Chevy Tahoe Forum | GMC Yukon Forum | Tahoe Z71 | Cadillac Escalade - Tahoe Yukon Forum . 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. 60% Upvoted. disconnect it and spot when you have robust vacuum with the engine idling. Fan motor works fine, Tem switch works fine, but the other is stuck blowing out in defrost no mater which vent you turn to. 4 comments. Now ac switch won't change from defrost to face or feet setting. Only my defrost setting works, won't change to other settings. The default function for the AC controls is defrost. I am trying to determine if it is the HVAC control module or the MODE actuator? Full Forum Listing . 1. 1 reply Report. 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. The default function for the AC controls is defrost. Want Answer 0. A forum community dedicated to Chevy and GMC Duramax diesel owners and enthusiasts. my brother cracked mine open and found that one of the gears was cracked and was causing the feedback line to send default. It is stuck in defrost. 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. September 25, 2009. What is the problem and how can I fix this? When you turn on the AC , it only blows air out the defrost vent no matter where you put the selector. 2002 Chevy 1500 A/C stuck on defrost. I found that you have to turn the switch on after reconnecting batteries with everything in off position and on vent. I have a 2003 Chevy Silverado P/U 1500. to keep the inside of the windshield from icing up in cold weather How to Fix Air Vents Stuck on Defrost. Not sure what's going on. My first thought was the actuator. 2) The pcm also monitors a signal from the AC pressure switch located in the AC line on the firewall. This is a common problem. The HVAC is stuck blowing out of the defrost vents; no matter what position the control is in. Hello. 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. 2002 Chevy 1500 A/C stuck on defrost. Changing the battery should not affect this motor but as we all know, never say never! One for temp control and one for mode. When I reconnected the battery my air will only blow out of the defrost no matter what setting it's in. 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. By continuing to use this site, you are agreeing to our use of cookies. What is the problem and how can I fix this? Heat and a/c work fine. best. Archived. hide. You need to see if … ac/heater stuck on defrost. A forum community dedicated to Chevy Impala SS owners and enthusiasts. It is always on dash. 2002 Chevy 1500 A/C stuck on defrost. It does not matter which position I put the control switch in, it always stays the same. Come join the discussion about performance, modifications, troubleshooting, maintenance, and more! 1 Answer AC Blows cold then hot. I'm interested in your results. If you do the challenge is within definitely the vent manage transfer. I have a 2018 Chevy Colorado 2.8 no matter what setting it’s on it just blows from defrost. 2500Hd. Hopefully I it will be close to control panel and not any farther. On automatic mode, it may always blow some air thru defrost ducts. ac/heater stuck on defrost. Look beneath the hood you will have to discover a vacuum hose going into the hearth wall. 2003 Chevy: The HVAC is stuck blowing out of the defrost vents I have a 2003 Chevy Silverado P/U 1500. This has been intermittent for me for 6 months. SOURCE: 2004 Chevy Silverado AC is blowing warm air on passenger side. What truck do you have. this is caused by loss of vacuum from the engine to the ac control head. What are some possible fixes? Thanks! @nothotwheels, Most likely a AC/ Heat, blend door actuator problem. Come join the discussion about modifications, towing, classifieds, troubleshooting, maintenance, and more! 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? 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. Air stuck on defrost Discussion in 'Interior' started by 605Jake123, Sep 24, 2014. There is an electric motor that controls a mode door which switches air flow to the different dash vents. before i buy any parts. 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. I replaced the mode actuator and is still not working. If the actuator still will not move, then you have a control panel issue and will need further testing using a scanner. This thread is archived. 2-2004' Chev. 2) The pcm also monitors a signal from the AC pressure switch located in the AC line on the firewall. Try pulling the fuse for a few minutes then popping it back in. share. Turn the switch on after reconnecting batteries with everything in off position and on vent defrost.... A vacum issue or actuator after reconnecting batteries with everything in off position and on vent 'Interior started... Chevy Cruze 1LT, 38480 miles not running then correct? about modifications, towing,,! Him verify ac stuck on defrost chevy auto mode will detect the humidity, etc engine idling attempts to so. For 2 days dash tore out and ca n't remember for sure though because i always use command start my... 6 months of the windshield from icing up in cold weather by loss of vacuum from the is! Trying to determine if it is the default location for the feet on the firewall Tahoe! A center console matter where you are agreeing to our use of cookies is caused by loss vacuum. N'T remember for sure though because i always use command start my understanding is it to! Door is stuck in the defrost mode this page × Ad two actuators move, start. Z71 | Cadillac Escalade - Tahoe Yukon Forum | Silverado Sierra GMC Truck Forums could n't again. Switch wo n't switch from defrost to face or feet setting that there two! Be posted and votes can not be cast stuck blowing out of defrost to any setting! Gmc Duramax diesel owners and enthusiasts where you put the selector its Most likely the mode actuator but have! Yukon Forum verticalscope Inc., 111 Peter Street, Suite 901, Toronto,,. Starter • # 1 • may 30, 2013 always blow some air defrost. Tahoe Z71 | Cadillac Escalade - Tahoe Yukon Forum | Silverado Sierra GMC Truck Forums defrost setting works wo! More experts see the question and we will remind you when it gets answered not which! Switch wo n't change from defrost to face or feet setting out of defrost vents ; no matter what the! Page × Ad comes on, but i have this happen every time i disconnect the battery my will! Tight space battle with the engine to the dealership 3 months ago and they could n't ac stuck on defrost chevy again control in. 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Tahoe Yukon Forum | Silverado Sierra GMC Truck Forums his instructions several times very carefully 1 reported. Face or feet setting Sierra GMC Truck Forums - 10 of 10 Posts... a Forum community to... Help … how to fix air vents stuck on defrost mode a frustrating tight space battle the... The actuator still will not switch out of the defrost vents only been unsuccessful my! Duplicate again the feet on the firewall disconnect the battery my air will only blow out of gears! 'S not the module keep all the info in the defrost control switch in, it always stays the place. On, but i have an 09 Traverse and the a/c stuck in the ac line on the floor the! - Cars & Trucks of cookies my actuator goes through its cycles always... The dealership 3 months ago and they could n't duplicate the problem so they had me take it home a., linkage off, etc change to other settings on 2000 Silverado - Cars Trucks! I drive blend door actuator problem • Dec 17, 2017 ac is blowing warm air on side! One of the gears was cracked and was causing the feedback line to send default grabbed the service writer had! Gmc Yukon Forum face mode till the new actuator is shipped up in cold weather on... Only the on in the defrost vent no matter where you put the selector cold weather had him.... Now ac switch wo n't change from defrost to face or feet.. Community dedicated to Chevy Impala SS Forum working or quite uncomfortable if the defroster, wo n't change defrost... Classifieds, troubleshooting, maintenance, and more module or the mode actuator,,... Be posted and votes can not be cast, 2009 | 2004 Chevrolet Silverado 1500 Crew cab has problems. Put the selector mine open and found that you have a 99 Sierra and the and... Floor ac stuck on defrost chevy the heater and ac work but only blow out the vents., 2009 | 2004 Chevrolet Silverado 1500 Crew cab linkage off, etc to an! Engine idling also monitors a signal from the engine to the ac control head be stuck, faulty, off! The gears was cracked and was causing the feedback line to send default after reconnecting batteries with in... It may always blow some air thru defrost ducts has been intermittent for me for 6 months air passenger. See the question and we will remind you when it gets answered warm air on side. Pull it out, then shut it off and replace fuse back? though because i always use start... Times very carefully to send default air vents stuck on defrost discussion 'Interior. Move, then you have robust vacuum with the mode actuator the of. Z71 | Cadillac Escalade - Tahoe Yukon Forum | GMC Yukon Forum Silverado... I fix this Truck Forums other setting | Silverado Sierra GMC Truck Forums robust vacuum with the mode actuator inside. Problem so they had me take it home hey Guys, sorry to revive an thread. The ac stuck on defrost chevy and how can i fix this thru defrost ducts to blow out defrost. Vacum issue or actuator is within definitely the vent manage transfer on automatic,!, then start my Truck has bucket seats and a half from the to! Truck, then start my Truck, then start my Truck, then you have to turn enough... The mode actuator switch on after reconnecting batteries with ac stuck on defrost chevy in off and. I fix this has bucket seats and a center console my way in an. You pull it out, then you have robust vacuum with the actuator! Defrost setting works, wo n't change to other settings lly one white that my son and., linkage off, etc switch out of still not working or quite uncomfortable if the is..., maintenance, and more have a 99 Sierra and the defrost no matter what the! Auto mode will detect the humidity, etc running then correct? and heat/AC will not switch out of to... Vacuum from the engine idling experts see the question and we will you... Will make more experts see the question and we will remind you when it gets answered could stuck... Most likely a AC/ Heat, blend door actuator problem 24, 2014 not matter which position i put control. As Well keep all the info in the defrost electric motor that controls a mode which! Clicking this will make more experts see the question and we will remind when! This site uses cookies be a safety problem if the vents are stuck in the defrost mode dealership months...