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hvac

  1. General
    2004 TB LS 4WD 4.2 I have an issue with the climate control and damper doors and not blowing where it should. If I pull the fuse to recalibrate the A/C will blow where it should . When I turn it to defrost it does what it is supposed and sometimes it will go back to A/C correctly sometimes...
  2. General
    I've recently developed a 1.72 - 1.78 amp parasitic battery drain on my '03 GMC envoy. I've traced the draw to the HVAC-B fuse located in the under-seat fuse box. By pulling the HVAC-B fuse I can see on my multi-meter a gradual drop from somewhere in the 1.7 amp range to under 100 milliamps...
  3. The 06-09 SS "How-To" and DIY Section
    Alright, so apparently this issue has been beaten to death, but I still cannot get a clear solution. I am getting no air flow from the front of my truck but all rear controls function fine. I replaced the blower resistor just now cause everything seemed to be about that but nothing has been...
  4. Interior
    Hello: I purchased a 2003 Trailblazer LTZ on May this year. after a month of regular use, hvac control module display started blinking and turns off after +/- 20 minutes of driving. Now, the control module just dies after 1-2 minutes driving. When it is on, the system works perfect. What would...
  5. The 02-09 "How-To" and DIY Section
    PLEASE NOTE: THIS ISSUE IS NOT SOLVED BUT THE SYSTEM WOULD NOT ACCEPT MY POST WITHOUT A PREFIX AND "SOLVED" IS THE ONLY CHOICE. Hi everyone! Well first of all my 02 LTZ found its way into a multiple vehicle wreck on July 30, 2012 and now resides in a salvage yard somewhere. Thankfully nobody was...
  6. OEM Issues
    I've read all the threads on how to replace this thing, but I can't see what's wrong with the one I've got? I can only get heat in all modes out of the drivers side vents. I pulled the blend door actuator off and did not see any stripped gears whenever I took it apart. I reassembled the cover...
  7. General
    I have the HVAC Mode Actuator click or pop, when it occurs, usually three sharp cracks. Looking around the forum, I found that there are 3 actuators in the system. Is there a way to verify or tell which one needs to be replaced? In my case it might be related to the a/c because we had a warm...
  8. General
    Have anyone ever heard of any problems with the store bought upgraded resistor/module packs for 05 TB/Envoy? I see the plug has to be spliced in to the old harness. Wondering if these control heads recognize these newer parts rahter than the oe direct fit style. The upgraded module is made by...
  9. General
    2007 GMC Envoy SLT with climate control Problem: If you have the rear air fan on and turn the front air off, the rear fan continues to run. However, if you try to turn the front air back on nothing happens. The screen shows the HVAC is back on but the front blower is not on. You have to...
  10. OEM Issues
    New to this site hopeing for some help... 2003 gmc envoy with dual automatic climate control I get heat only will not change on either side .. have reset ambient temp ... inside cabin temp sensor reads 176 f. Seems strange that both drivers and passenger tmep blend doors would fail at same...
  11. OEM Issues
    i just bought a 02 tb LT with the I6 in it and didnt notice the problem with the hvac.. wouldnt have bought if like that if i knew and unfortunately it was (as is) so.... yeah i gotta fix this and am not paying a deal or mechanic to do something i can do with the right info. so i been looking...
  12. OEM Issues
    The fuse block that is located under the drivers side rear seat has a sloppy/ intermittant connection on fuse 44 (HVAC), thus creating my HVAC to also be intermittant. What i am wondering is what color is the wire that comes out of the fuseblock and goes up front to the fan switch(or wherever it...
  13. OEM Issues
    OK - so maybe I am being to picky or maybe it is that I haven't had a GM product since my 1977 Impala, but I am struggling with the AUTO HVAC. On my 2001 Toyota Sienna, we have the Auto Climate control set to 76 and it pretty much just works - keeps us cool in the heat and doesn't blast us...
  14. OEM Issues
    So I've been searching through, reading a bunch of posts about AC issues, but still can't figure this one out. My problem is that the blowers don't seem to be working as well as they used to out of the front vents. When I have it set to just the dash vents, there is air coming out of the floor...
  15. General
    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...
  16. Interior
    I suspect my wife is turning off the truck without blowing fresh air through the condenser coils... We took the truck out last night, and we got a nice musty odor coming through the vents as we pulled out of the garage. She said "it's been doing that lately." I looked down at the HVAC...
  17. Interior
    I am new to the site... finding almost too much information and trying to keep from posting by searching and reading. I am an IT engineer and love troubleshooting things myself but I have some questions because I am not sure I am being patient enough waiting for results from my testing. I'll...
  18. Interior
    i was driving my '05 envoy to work today and had the defrost on. i hit the down arrow on the fan speed button (digital controls) and lost all power to hvac controls (nothing on display screen where temp usually is, none of the buttons work at all on the front or back hvac controls)... i checked...
  19. 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...
  20. General
    Ok, I'm not sure if this is a real problem or just me. I searched through the threads but could not find the same specific thing ( I probably did not look hard enough) Here's what's going on, now that the seasons are changing it's getting colder outside and the climate control is acting...
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