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