Question about 1995 GMC Suburban

2 Answers

A/C Cluth not working-replaced Cycling Switch already

98 GMC Surburan. At the end of last summer the A/C would randomly come one and off. This year it isn't working at all. Hubby discovered clutch not engaging. He jumped it at the accumulator-clutch started working. He replace the A/C recycling switch and still the clutch won't engage. He jumped again and the clutch kicked on. He did notice when he took the old switch off there was what looked like radiator fluid--he thinks it is dye from the A/C test we had last year?

Also, when the he jumps the switch the clutch works but no cold air.

We had the A/C tested and recharged last year. It was about 1lb freon low.

I see some people speak of a "pressure switch" is that different from the cycling switch?

What about hi and low switch? Where are they located?

Please help Texas is hot.

Posted by on

  • 7 more comments 
  • header_ralph Apr 22, 2009

    emissionwiz-re-cycling switch? I mentiod a cycing switch, which is located at the accumulator. It is an actual part and we replaced it.



    goofduck-So you are saying that it is a "safety feature" that is preventing the clutch from engaging as a result of low freon? We had a dye test about 8 months ago and no leak detected. Could it be that the "pressure switch" itself has gone bad and not able to determine the pressure accurately?

  • header_ralph Apr 22, 2009

    goofduck-

    Thanks that is what I we were trying to figure is what we could rule out. Can you rent these gauges at auto part stores? Do they hook up to the accumulator? Or would it be best to have a shop do the testing we had done last year?

  • header_ralph Apr 22, 2009

    Thanks for your help.

  • header_ralph Apr 23, 2009

    Took it to the shop today. No leaks and pressure is fine, also not low on freon. They say the compressor is bad and needs to be replaced.



    Question...

    They say the accumulator has to be replaced when you switch out compressor...True or False???



    My hubby plans to switch the compressor out himself but wanted to clarify about the accumulator.

  • header_ralph Apr 23, 2009

    OK thanks.

  • header_ralph Jun 12, 2009

    We are replacing the a/c compressor, dryer and orfice tube.

    Question.

    We have had people at shops tell us different things about flushing the system.

    One shop says you need to flush the system before replacing the old parts.

    Another shop says you need to flush the system after you have installed the new parts.

    When do we flush the system?

  • header_ralph Jun 12, 2009

    You know I am not sure the color of the residue. A shop told us the compressor had seized.

    Do we need to have it flushed again after we install the new parts?

  • header_ralph Jun 12, 2009

    We knew we needed to have it evacuated and recharge but this one shop is telling us it needs to be flushed twice.

    So..

    Flush
    Change parts
    Evacuate
    Recharge

  • yadayada
    yadayada May 11, 2010

    there is no AC recycling switch, the system is low on charge.

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2 Answers

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  • GMC Master
  • 76,691 Answers

The Low pressure switch and the compressor cycling switch are one in the same.

Posted on Apr 22, 2009

  • 2 more comments 
  • yadayada
    yadayada Apr 23, 2009

    He replace the A/C recycling switch and still the clutch won't engage and I quote.

  • yadayada
    yadayada Jun 12, 2009

    If the system has black residue in it the compressor has failed, if it is clear no need to flush. You flush the system with a special fluid and compressed air, u do it before you install the compressor.

  • yadayada
    yadayada Jun 12, 2009

    if the oil in the system is discolored (the oil should be clear) the system need to be flushed, please take a min to rate my help. Make sure you pull a vacuum on the system before you recharge it, this is very important!

  • yadayada
    yadayada Jun 12, 2009

    I WOULD DO THE FLUSH TWICE, THAT MEANS THERE IS ALLOT OF DEBRIS IN THE SYSTEM, (FROM THE OLD COMPRESSOR) THIS CAN CLOG THE FIXED ORIFICE SCREEN THE SYSTEM PRESSURE WILL GO OFF THE SCALE AND THEN THAT WILL DESTROY THE NEW COMPRESSOR.

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  • Master
  • 490 Answers

The system has a definite leak and should be fixed then the system should be recharged there is a pressure switch that keeps the clutch from engaging when the system is low on freon which keeps from burning up the compressor

Posted on Apr 22, 2009

  • 3 more comments 
  • Jeff Adkisson
    Jeff Adkisson Apr 22, 2009

    the switch is a low pressure switch when it reads a low pressure in the system it will not let the clutch work
    I would put a set of ac gages on the system and check pressure
    the system has o-rings that seal all of the fittings and they go bad
    could take 8 months or 2 days they can fail at anytime
    if your hubby jumps the switch and the clutch engages it is not the pressure switch


  • Jeff Adkisson
    Jeff Adkisson Apr 22, 2009

    i would let a shop do it the gauges are not cheap and you have to know how to read the pressures and I know how the heat in Texas is I am from Louisiana but will be down in Austin in June for the rot rally



  • Jeff Adkisson
    Jeff Adkisson Apr 22, 2009

    you are very welcome good luck with your ac

  • Jeff Adkisson
    Jeff Adkisson Apr 23, 2009

    TRUE you need to change the accumulator and the orifice tube and the compressor all at the same time then evacuate and recharge the system

  • Jeff Adkisson
    Jeff Adkisson Apr 23, 2009

    you are very welcome and good luck with your project
    also if you dont mind if you have a minute please comment on the help i have provided on the website


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