Question about 1990 Chevrolet K2500

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My 1990 corvett , the air condition blows cold like it should and then just starts blowing warm. Several minutes go by and it starts blowing cold again. Any ideas?

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  • lazysteve73 Sep 04, 2009

    Dude that's the best advise I've ever got.



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First I would have the system checked for proper charge. If it is a little low this can be one symptom. Another is loss of voltage to the compressor from the control head. Another possible reason is the ac clutch coil may be getting hot and then opens. When this happens the compressor is off. Once it cools a little then it resumes.

Those are the first steps in action to address your problem.
If problem still remains, then follow the below Guideline :-

I would check your a/c drain tube for a blockage, at least partial. What you have described is a freeze up of the evaporator. If the condensation can't escape the heater box quick enough it will form ice on the evaporator and stop airflow over it. It will then have to thaw for a while before it will work again.
Hope i helped you.

Thanks for using ' Fixya ' and have a nice day!!

Posted on Sep 04, 2009

  • Jose DeMoya Dec 08, 2011

    Also it could be the presence of moisture in the system causing the orifice tube to freeze. When that happens you lose the cooling. When the metering device (orifice tube, expansion valve) thaws, it begins cooling again.
    So, as you can see, there can be multiple causes for this symptom.
    So you will need an AC technician to help with that one.



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