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Chevy Silverado and GMC Sierra Climate Control



  • rayt2rayt2 Posts: 1,208

    Replaced the resister on fan motor housing and resolved the problem.
    $26 part at AutoZone in stock.

    Ray T
  • gmcustsvcgmcustsvc Posts: 4,252
    I would recommend taking it back to your dealer for the necessary information. If you have any questions or concerns, feel free to contact us directly. Good luck on your progress!
    Joey, GM Customer Service
  • I received the letter but have lost it. I think I am nearing the mileage cutoff for the repair. Can you send me the link or the pdf so I can print it up and set up an appt!! It is impossible to find anywhere else on the internet....
  • I can't get my heater to blow out hot air. In the past month I've changed the heater core, the thermostat and water pump due to separate issues but I still can't get it to blow out hot air from the vents. It does blow out cold air though. I also hear what sounds like bubbling/boiling water in the cab when I'm driving (stepping on the gas only). I really need to get this fixed before the really cold weather hits. What can I do???
  • obyoneobyone Posts: 8,054
    Sionce the heater system uses coolant to heat the air the most common cause of no heat is low coolant. When changing the thermostat, heater core, and water pump, the system needs to be topped off after the thermostat opens. If not you'll have low coolant.
  • redgeredge Posts: 1
    Have 2006 GMC 1500 doing same thing. One thru four works but # 5 does not. Received letter from GM last week (special Bullentin 10240) on manual temp control switch. Gm realizes theres a problem with the hvac system not working on certain blower settings and would repair this problem if taken to GMC dealership. Took my GMC to Macon Ga. dealership and was told #5 was not in the covered plan to repair. Dealership said it would cost 328.00 dollars to repair. Can anyone figure this out?
  • I'm glad that you posted, Redge.

    We would like to speak with the dealership to clarify a few things. Do you have an appointment already set up to have the repair done, or is your vehicle currently in at the dealership for repair? Please send us more information, including your name and contact information, the last 8 digits of your VIN and current mileage on your vehicle, and involved dealership. With this information, we will set up a case for you with Customer Assistance and will be following up for you with the dealership.

    Thank you in advance,
    GM Customer Service
  • Did you ever get this fixed and what was the solution? I have a chevy tahoe 2004 and I have had this exact same problem for a couple of years now. Thanks
  • Yes I did, after replacing 2 of the fan control modules I replaced the wiring harness at the fan. The stock harness overheats and melts, shorting out the contacts, bad design. Not hard to change, just have to pay attention, the replacement harness wiring isn't color coded. Can't remember if I bought the new harness on Rock Auto or off of ebay, but it was like $17.00. Good luck and Merry Christmas!
  • I have an 2006 1500, last week hot air stopped blowing out of the driver side vents and continues to work on the passenger side. It has sporatically come back a time or two but is gone again after the truck sits for a couple hours. Any Ideas whats wrong or how to fix it?
  • If you were to email us the last 8 digits of your VIN, we could check to see if there are any open recalls on the HVAC. When you do send this email, please describe your concern in it (as it can be difficult to link emails to posts at times, and we want to be best able to assist you).

    GM Customer Service
  • I forgot to mention that I did a radiator flush and I've kept checking the coolant levels and it is topped off. Still no heat coming out.
  • I'm having the same issue with my 2009 Sierra. Passenger side holds steady but the driver side keeps alternating between hot and cold on mine, even if I just have the vent on with no blower running. Sounds like the same issue you're having. Did you ever find out what it was because I'm stumped? Has to be a temp sensor somewhere that keeps triggering on and off. Do you have Dual Climate Control? Also, did the GM Rep ever get back to you?
  • Jwulf72,
    As your Sierra is a 2009, this may still be covered by the Bumper to Bumper warranty. We can let you know the specific parameters of your warranty if you were to send us an email with your name and the last 8 digits of your VIN.
    GM Customer Service
  • I think I found out on my 06 what it was, there is a connector just below the dash (easy to get to if you don't have the full center console) next to the driver side floor vent. It was loose like someone had stepped on it or pulled at it. I disconnected it while the truck was running, made sure it was clean and then firmly reconnected it. So far heat has worked on both sides for three weeks.
  • furrowjockyfurrowjocky north central MontanaPosts: 12
    on my 2011 Sierra 1500 crew, I have had heat distrubution problems since day one. Plugged off center vents to get more air flow on passenger side. Helped a little, seems like to much is going to defrost or vents are to small to passenger and drivers feet. Its 30 below zero here in northern Montana again, so it makes the problem very noticeable. 100 miles from dealer have'nt had time to take it in yet, purchaced in Jan now have 27000 mi on it. Unrelated problems, gravel has beat out rear back up sensors, passenger wiper leaves last three inches of windshield not cleared, and fabric on seats is impossible to get lint and hair off. Want my 06 back! I've owned GM for 35 years, currenty have 6, this has been most disappointing purchase ever.
  • Furrowjocky,
    I am sorry that your 2011 Sierra isn't currently satisfactory for you. I see that you may be looking at taking it in to the dealership for the heat distribution concerns you described - please keep us posted on how this goes. If you are not satisfied after the visit, we'd be happy to help follow-up with you and your dealer and continue seeking to resolve it.
    GM Customer Service
  • 2006 silverado..dual heat control...heater works but goes out when the truck idles for any length of time. then heats back up when the truck is back in gear heading down the road.
  • furrowjockyfurrowjocky north central MontanaPosts: 12
    Thanks for the reply. Took vehicle in to Bennett Motors on 1/25, no problem with heater was found, they're going to look into it further next appointment. The other reason for the last visit was evap system was plugged and haven't been able to fill with gas. They ordered in canister, but forgot to order solenoid, so my day off work and a 100 mile trip was wasted, they did apologize. As you probably know this is a chronic problem with pickups and suv's forever. I've spent a 1000 dollars on my two 06 pickups for new canisters and solenoids. Van Motors in Conrad Mt has been smart enough to reroute hose to front of vehicle, so it won't plug again. Bennett told me GM is coming out with a reroute kit sometime. The other problem with rear backup sensors being beat out by gravel could not be fixed under warranty. I guess pickups are not to be driven off highway! GM really needs some protection for these sensors. Oh and windshield wiper problem, they put on new wiper and discovered it does not touch last 2-3 inches of passenger side either, so they went out to their lot and looked at other 2011's and discovered none of them touch. I can't believe I'm the first one to notice this! I hope you take this note as constructive criticism, I do like the power, the handling, and looks of my 2011 Sierra 1500 crew, and have owned GM vehicles for 30 years and would hate to switch to the F word. I'll be in touch with how heat distribution problem goes, if you have any ideas, you can contact Sheryl Mcallister, service adviser, Bennett Motors, GT. Falls MT. Thanks
  • I look forward to further updates!
    GM Customer Service
  • I need to know the name of the gear or part that switches the defroster to vent and so on it knocks every time i start my truck, and wont allow the heater to switch to vent from defroster or any of them just blows out the defroster vent. it knocks behind my gage cluster wear its also located.can anyone help? I have a 2003 silverado 1500 4.8L thanks Mike
  • furrowjockyfurrowjocky north central MontanaPosts: 12
    My problem with with heat distribution is still not solved. Have heard from other owners in my community, one with a 2011 silverado, one with a 2011 yukon XL, having same problem. We discussed that unless temperature is around 0 degrees or below the problem isn't as noticeable. So vehicles sold in middle of US or in the south are not aware of problem. Apparently the system was engineered this way, not enough air velocity to floor vents and too much to defrost vents on windshield and side windows, when selector is on dual mode. On the silverado, Bell Motors in Cut Bank MT told the owner to bring it in and they would re- program the heater. I told Bennett Motors in GT. Falls about this, and the had no idea that this was possible. It will be interesting to see if Bell Motors can solve problem.
  • I have an 06 V-6 Sierra
    When I drive my truck with the recirculation button light on and my A/C button light off, I hear my A/C compressor turning off? Also when my truck is warming up in the morning in heat mode I will hear the auxiliary fans turning on and off?
    If I turn the recirculation button off ( light is off) then no compressor no auxiliary fans are kicking in? I was under the impression I could have the the recirculating switch on and the fan control on any setting and would only be circulating the cab air?

  • KCRamKCRam Mt. Arlington NJPosts: 3,516
    The compressor will definitely come on if you're using the defroster, as the compressor and evaporator work to dry the air - otherwise, moist air will freeze on the inside of the windshield once it's turned off. Check your owner's manual to see if the defroster is automatically activated below certain external temperatures upon first-start./warmup.

    kcram - Pickups/Wagons/Vans+Minivans Host
  • I have a 2005 Silverado 4X4 Crew cab. During warm up first thing in the morning with the truck is at or about 210 degress the climate blows cold until I start driving and then blows hot air. Also at temperature stopped at traffic lights/stop signs and at iddle the climate control blows cold air, while driving I have heat.
    Further info... recent tune up less than 3500 miles, out of warranty, current mileage 87,050, 2nd owner of truck I bought it 2007 at a dealer.
    Any help would be great. I would kind of like a idea before I spend too much for mechanic's diagnosis of the complete front end. No offense to any wrenches...
  • gmcustsvcsarahgmcustsvcsarah Posts: 1,964
    I understand that you are looking to gather any options before paying for a diagnosis. We can check to see if there are any open recalls or anything on your vehicle for you if you wanted to send us the last 8 digits of your vehicle's VIN.

    GM Customer Service
  • reteilsreteils Posts: 1
    I too am having unresolved intermittent dual climate control trouble with my 2004 Silverado. Last time in the dealership they said there was a TSB released for this problem. I've been looking for it on the web but I cannot find it. If someone has it I would appreciate a copy. Thanks. 
  • todd65todd65 Posts: 1
    This reply is for reteils on post #363. the info you are asking for is NHTSA #10012173/ TSB #040138008. I have replaced my instrument cluster and heater control module at my own expense due to mileage and poor timing on recalls by GM. However, I am still having the most common problem as everyone else here on the A/C unit blowing hot air on the driver side, etc.... Sounds like this has been an issue for over 10yrs now. I'm a full blown Chevyholic, but I am not impressed with these issues not being addressed in a decent amount of time. If anyone can pinpoint me an answer w/o taking my 2004 Silverado to a shop I would greatly appreciate it. All repairs have been not so cheap, but have easy so far.
  • Sounds like you might be low on coolant, which would not allow enough pressure to build up to open you thermostat to get your heater core warm enough at idle. Also you may have an air pocket caught in the system. Google how to bleed the system if your mechanically inclined enough(not saying your not) but i have ran into similar problems on my older Chevy. Plus both are pretty much cost free to check yourself which makes it even better
  • My 2000 GMC did this I could not find replacements so I simply cut away the plastic and hooked the hoses directly to the heater core. It has worked fine for several years now
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