Question about 1997 GMC Safari

3 Answers

A/C is blowing hot air

We have jumped the pressure switch and the compressor kicked on, we then put 1.5 cans of freon in until full and washed the radiator fins and still get nothing but hot air. The compressor comes on when the a/c is on, but is still not pumping hot air

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  • jpringle Jun 20, 2009

    We have done a black light test for leaks and found none, plus the pressure has remained consistent, is there a way to test the condensor?



  • jpringle Jun 20, 2009

    No damper that I know of ???

  • jpringle Jun 20, 2009

    The compressor does come on now with the dash switch, after we filled the freon it kicked right on. By the pressure is consistent, I meant that the freon level remained full which led me to believe it probably was not a leak. As far as the damper door when I turn the thermostat to hot defrost there is hot air coming out of the dash, however, when I turn the a/c on, there is slightly warm air coming out of the vents

  • jpringle Jun 20, 2009

    what exactly would I be checking for in the blower box, how do I check if the evaporator is clogged?

  • Dennis Boxerman May 11, 2010

    Don't forget to check to see if your system has an air filter in the system. That could be stopped up.

    Don't hesitate to invest $20 bucks in a manual that has exploded views of this system. It would make it a ton easier.



    Again, good luck.

  • Dennis Boxerman May 11, 2010

    When you say "The pressue has stayed consistant", do you mean that it is not dropping down on the low side, into the cooling range? Or is it not moving and staying at a high pressure (over 50psi) all the time.



    There is a damper door that directs the air flow so you can "Blend" the cool air with the warm air from the heater core. It could be stuck or you have lost a part of the vacuum system.



    Does the compressor come on with the dash switch or do you have to jump it out to get it to work?



    If your problem is not solved, get back to me.



    Good luck

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You may have a leak in your system or the ac condensor could be bad.

Posted on Jun 20, 2009

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Check the blower box, if the evaporator is clogged then your system will blow hot air.

Posted on Jun 20, 2009

  • larry blais
    larry blais Jun 24, 2009

    The evaporator looks like the heat core, it is inside the same box that houses the heater core and the blower motor.

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  • 11 Answers

Close damper ? does it have one.

Posted on Jun 20, 2009

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1 Answer

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Does the compressor kick in when you turn it on?(if not it could be the a/c switch or the power to it, the a/c clutch wire connection, the clutch itself, or it's low on freon) You should hear the clutch kick in when you turn the a/c on. Low freon will also cause the clutch to not kick in. Remove the low-pressure switch plug and jump it with a piece of electrical wire. If the clutch kicks in, you just need to add some freon. Put the plug back where it was after you remove the jumper wire.
Is the belt on and adjusted to the right tension? If the belt is loose it won't cool as good as it should.
Check the freon in the system with a gage. If it's low, add some to the right amount and see if it cools. If it is overcharged, it will blow hot air, too.
The heater control valve slider should be all the way to the left so hot water isn't allowed to circulate through the heater core which would also make it blow hot air out the a/c ducts.
Good luck, they can be a pain, but with careful, step by step troubleshooting it can be fixed. There is plenty of information about a/c online to help you out. Try googling in: auto ac troubleshooting tips for more info. garcuda

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