Question about 2003 GMC Envoy

2 Answers

AC blowing Hot air after battery was disconnected

I changed waterpump in 98 GMC jimmy and now AC blows hot. Was told it needs "flash programing" from dealer because I disconnected battery. Is there anything I can do instead of taking it to dealer?

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  • stevensue767 May 26, 2009

    yes compressor does work. You can here the pressure trying to change and it starts to cool for a split second then goes right back to hot. Worked perfectly fine before changing water pump

  • stevensue767 May 26, 2009

    OK disconnected battery for 5 min and same thing. Started to blow cool then right back to hot

  • stevensue767 May 26, 2009

    local mechanic told me to drive 45mph or more for 10minutes and it might reset itself. Does this sound likely?

  • stevensue767 May 26, 2009

    is the blend door motor actuator an easy fix? Where is it located?

    Is it likely it happened when waterpump was changed or just a coincidence? Thank You so much for your help.

  • stevensue767 May 26, 2009

    Ok guys thanks for all your help. GM dealership here wants to charge me $110 to do a "flash programming". They said it would reset my AC and or tell me what problem is. Should I have this done or no?

  • Michael Masters
    Michael Masters May 11, 2010

    I will do further research on this issue and return with a solution shortly..

    Very interesting issue you are having here....


  • Michael Masters
    Michael Masters May 11, 2010

    Yeah, never heard of flashing an AC system.lol

    Check the clutch action under the hood. it should click when the compressor is engaging. if not, this is a bad clutch assembly. check the AC switch in the dash as well. make sure it is functional.


  • yadayada
    yadayada May 11, 2010

    who told u this? (because it is 100% WRONG) does the ac compressor run?

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  • Master
  • 6,784 Answers

OK, looks like your temperature control cable is damaged. you will need to replace this.

Posted on May 26, 2009

  • 2 more comments 
  • Michael Masters
    Michael Masters May 26, 2009

    Driving the vehicle at that rate of speed will not fix this issue.

  • Michael Masters
    Michael Masters May 26, 2009

    this truck dose have a temp control cable. its a 98 jimmy...

  • Michael Masters
    Michael Masters May 26, 2009

    Actually, emissionwiz is correct on this one. your vehicle dose have a Blend door Actuator and, during the disconnection of the battery, there may have been a short that produced a Oe Failure.

    I have just confirmed this and i retract my previous statements. i do apologize for the confusion due to my conflicting assessment.

    The replacement Blend door Actuator will cost 139.99 and, it is not easy to replace if you are not a skilled GMC tech.


  • Michael Masters
    Michael Masters May 26, 2009

    Under these circumstances, i would recommend Diagnostic scan(flash). the actual problem is quite hard to detect at this point so, this flash will be more accurate and, it will also pinpoint the issue at hand that is causing this disruption of proper air flow.

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  • GMC Master
  • 75,197 Answers

TRY DISCONNECTING THE BATTERY FOR 5 MINUTES AND SEE IF IT COOLS AGAIN, SOUNDS LIKE A TEMP CONTROL BLEND DOOR PROBLEM. DISCONNECT THE NEG CABLE OF THE BATTERY.

Posted on May 26, 2009

  • yadayada
    yadayada May 26, 2009

    No it doesn't sound like a likely fix, something has gone wrong with the blend door motor actuator, that much is certain

  • yadayada
    yadayada May 26, 2009

    YOUR TRUCK DOESN'T HAVE A TEMP CONTROL CABLE, IT IS ELECTRONIC CONTROL VIA A SERVO MOTOR.

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