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Chevy TrailBlazer Climate Control Questions

245

Comments

  • moe81854moe81854 Posts: 3
    I have a 2003 Trailblazer I am having problems getting heat to come on takes 10 to 15 minute or until car get to 150 degrees before the blower fan starts and I get any heat on any setting.
  • ticadooticadoo Posts: 40
    Just purchased a 2003 Chevrolet Trailblazer, extended, loaded. Only cold air will come out of passenger vents. Dealer had for over a week replacing motor and acuator. Just got truck back...still doing the same thing. Any suggestions? Thanks
  • jerrcribjerrcrib Posts: 21
    I changed control modulator on my 2002 trailblazer.part about 150.00. Then I sprayed wd 40 inside under dash on all vent controls etc. fixed my problem
  • ticadooticadoo Posts: 40
    Thanks for the info. Mechanic supposedly replaced modulator; then realized the "acuator" (not sure of spelling) was bad, which was thought to have caused the modulator to go bad. After replacement of both, I still only get cold air out of passenger side. Do you think the "magic charm" was the WD40?
  • jerrcribjerrcrib Posts: 21
    I know that it worked for me, after I changed control modulator,I still had vent problems. After I used wd-40 on all interior parts,flapper etc. I have had no more problems. jerry ps I believe the flapper valve was sticking
  • ticadooticadoo Posts: 40
    Thanks!! Will pass this on to my mechanic and hope it works!!
  • moe81854moe81854 Posts: 3
    were is the acuator located and the heat sensors on a 2003 trailblazer ext 4x4 located i put in a new control module and it still doesnt come on till temp gauage is 150 or higher some times and if i shut the truck off and turn it back on it still doesnt come on i thought the fan motor should come on when you put defroster on can any buddy help me
  • ticadooticadoo Posts: 40
    I had modulator, accuator and some heat fan thing (behind dash) replaced on my 2003 Trailblazer due to heat coming out of drivers vents, but only cold air out of others. I now have heat, but it does not blow like it is supposed to. Now, my A/C doesn't work nor does the rear heat or A/C work. Is there any end to these problems?
  • lrs1018lrs1018 Posts: 2
    Having problems with a/c vent control on 2003 Trailblazer. Back vents work fine, nothing in front but a little out of leg area. I see quite a few have same problems. Where is modulator located and how do you get to vent flappers to put WD40 on them? Any help will be greatly appreciated.
  • jerrcribjerrcrib Posts: 21
    control modulator is where you turn on your a/c and heat,middle front, you then have actuators for each vent flapper,I would say it is the main control modulator. To spray wd40 into flapper vents go up under dash at glove box, glove box snaps right out, spray up into left side toward steering wheel,turn air off and on and different settings. good lucl jerry, ps try the wd 40 first
  • gorilla2gorilla2 Posts: 1
    has their been a issue with the fan speed controls? is their a resistor pack? i have a 2004 with only 2 thru 4 working.
  • traveler73traveler73 Posts: 5
    when air is on condensation leaks all over floor from underneath dash ---has anybody had this happen/ know what it is?????--thanks!
  • lrs1018lrs1018 Posts: 2
    I opened glove box and i see nothing but fan motor. How do i pull radio and control modulator out because i see no actuators to spray any wd40 onto, ( where are the vent flappers) this all sounded easy till i opened glove box and looked inside.
    SORRY
  • jerrcribjerrcrib Posts: 21
    drop glove box to floor look to your left under dash just spray the wd 40 into this area it will coat everything,it will not hurt electrical components. You will not be able to see what you are doing. First actuator is to your immediate left. To change control modulator you will have to remove all the trim from front of dash,it is all one piece,it is really not that hard to do, You can the get to modulator radio speedometer cluster. To get to middleactuator,etc. you will have to pull completetop of dash out. I would not recommend you doing this.If i can help you more let me know. Jerry
  • jerrcribjerrcrib Posts: 21
    control modulator gm has always had a problem with this, no way to repair different components, all one piece about 160.00 from ac delco gm parts on line
  • cjoyce01cjoyce01 Posts: 2
    My a/c has been running cold but only for about 30-40 minutes and then the air blows warm. I don't know if this is a normal service issue or does it mean there could be a leak? There's nothing in the owners manual for servcing the a/c.
  • jerrcribjerrcrib Posts: 21
    something is cutting out power to the a/c clutch,clutch sensor switch or low pressure switch. check freon first but if it cools for that long I would say the freon is okay no leak. I have a 2002 trailblazer and have had this problem off and on for 7 years dealer never found the problem under warranty. The next time it quitscooling pull over cut engine off and start up again to see if it starts cooling again. jerry
  • cjoyce01cjoyce01 Posts: 2
    Thanks Jerry! I'm going to a dealer tomorrow but I don't want them running up my bill for stuff I don't need, i.e. freon. I'll try your suggestion. At least I feel armed with knowledge for tomorrow. Thanks again!
  • shutterbshutterb Posts: 1
    Where is this sensor and what does it look like? I see a small two wire sensor just in front of the radiator. is that it?
  • pa2tx2mdpa2tx2md Posts: 1
    I am having the same problem with my 2003 trailblazer. The external temperature reading fluctuates, starting out at 50 degrees and staying there until it eventually corrects itself. Then it may go back to 50 degrees. The internal air comes on full blast as the external temperature reading rises rapidly to read the actual outside temperature. Did replacing the ambiet outside temperature sensor resolve the problem. Is it something that a dealer has to do or is it a relative simple fix? Where is the part located?
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