Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum banner


  1. No Heat when starting TB with remote start only when key turn

    Audio and Electronics
    I installed an Autopage CS-RS-730 remote starter in my 04 TB about 2 years ago. Upon exiting the car I would select the thermostat on setting 4 and position the other thermostat control to the windshield so that when I started the car in the morning it would defrost my window. All worked well...
  2. Heat/ac issue

    i have a 2005 chevy trailblazer LS. it has been rock-solid in its 96000 miles. but in the last 6 or 8 months i have been having a slight issue with it. hopefully someone has some insights... it started in the winter. i would put the heat/defogger on and it would take a verrrry long time to...
  3. Possible heater core plugged?

    Hey everyone, im new to the forum so trying to still figure out how this all works. :) I have a 2002 GMC Envoy and the A/C worked great all summer but when it got cold and I tried to use the heat, it wasnt getting hot. I replaced the thermostat and that didnt help. Engine temp gauge is running...
  4. '06 TB with no heat at all

    OEM Issues
    I am trying to diagnose a really stubborn heat problem on my 06 Trailblazer. There's no heat at all, ever. Took it to shop, who kept it for a week while I was out of town. First they said the core was blocked, but they say they flushed it out. They say that that both hoses are warm (I...
  5. A/C having problems

    OEM Issues
    Recently when I was running my air conditioner, it just turned off all of a sudden and wouldn't work on any of the settings. A few days later, it started working no problem for a few days. Every few days it kept happening again and I noticed a burning smell when it was on. After working on it...
  6. Heater control fan/module

    Last summer i replaced the resistor pack on the fan motor for the heat. Everything it tight and works. Periodically the fan will stop turning even when the swithc put on high. this is on a auto climate control system in the tblazer. the control head module has to be turned off then back on...
  7. defrost on then stalls out!

    OEM Issues
    2002 envoy_I have a problem every time I turn my defrost on my truck starts chugging and the rpm's go crazy then stalls out but it only has this problem when the defroster gets turned on heat and AC work fine truck runs normal, could anyone tell me what might be the cause of this?
  8. Engine Idle Really Rough When Heater is Turned On?

    OEM Issues
    Hi, I have a 2002 envoy with nearly 200k miles. I've kept it in good shape making necessary repairs along the way. A couple weeks ago, I turned on my climate controls fan switch (A/C was on) and the engine really started to idle really rough. I have the manual system, not digital. I...
  9. Automatic Climate Control

    I have a 2003 Trailblazer with automatic climate controls. Most of the time it work ok, but once in a while, it will 1. No fan (any speed) or 2. No Air or 3. No heat Doesn't seem to go with any pattern, It just start screwing up.. Then all of the sudden it starts working normal again...
  10. heater/ac control issues

    Hello All! This is my first post since I can usually find the answers to my questions by searching the past posts, but this time I am stumped!! I have an 03 TB with the manual dual zone heat/ac controls. The other day I noticed with the ac on only cold air was blowing from the passenger side...
  11. fan wont work (and rear console problems)

    SO I had a diesel Passat, but it broke. I used to live in the states thats why I got a Chevy. Kinda... Bought this TB 2003 LTZ. It had (has) some problems that I havent quite figured out... The fan is, well... it has a life of its own. Most of the time it doesnt work, sometimes I can get it to...
  12. Heater Control Valve Coolant Leak

    I have had a coolant leak from the heater control value. The leak is from the top and not from the hoses themselves. I replaced the heater control valve and the problem continues. What is the small vacumme line that attaches to the top? When it is attached it leaker much worse (because there is...
  13. 2003 Blazer heat no ac? open to suggestions

    My 03 ext climate control unit will not function at all, whether its on 1-5 manual speeds or on auto climate control. It stopped working few days ago and since then nothing has worked except for one instance where the fan kicked on full blast for a min or so but then stopped again. I have read...
  14. Rear Hvac slow heat

    OEM Issues
    I've been looking around for quite a while and cannot find the issue that i have. the issue is that my rear heat takes forever to get warm. example it's 30 degrees outside and after 5 minutes of driving i can turn on the front heat and it's blowing warm air. so i'll turn on the rear heat and...
  15. Seat Heaters Not Working

    The only things I do not like about my TB are some of the electrical problems I've had - minor, but still real pains in the butt!! Recently (thank goodness it was the end of the winter) both of my front seat heaters konked out simultaneously. I know it can't be the heater pack or anything like...
  16. 2004 trailblazer abs/brake light + heater

    I'm a new user to this site and I'm a little confused so I apologize if I posted in the wrong place. My question is... just recently my abs and brake lights have come on and stayed on. At the same time my heater was blowing at speed 3 and it just quit blowing. Speed 4 never worked but now none...