Question about 1998 GMC Sierra

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After replacing a high pressure switch on my 98 gmc sierra a/c

The auto technician said the compressor is toast, because, he said it wouldn't take charge, the unit will not kick in

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  • marcial adorno
    marcial adorno May 11, 2010

    explain in more details



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Take your truck somewhere else... "wouldn't take charge" doesn't even make any sense... The A/c system on any vehicle has 2 switches, high pressure, which is a "fan request/safety" switch that turns off the compressor clutch and turns on the engine fan in electric fan applications when refrigerant pressure reaches around 300 PSI to drop the pressure and complete the refrigeration cycle, and the low pressure switch, which basically doesn't allow the compressor clutch to run if the system is low/empty of refrigerant (turns it off under about 10-20 PSI). My guess is, if he couldn't get the refrigerant back in the system, either his a/c service machine was malfunctioning, or he didn't know how to use it... I've seen a LOT of both on the field... I'm sorry to say there is a lot of people working on automotive A/c out there that don't really know what they're doing, but sincerely believe they do... Short of giving you a definite answer, i'd get a second opinion on that before spending any good money on a compressor (which are usually pretty pricey)

Posted on Sep 08, 2009

Testimonial: "Yes, you are absolutely right, I checked the compressor by hand, turned it by the clutch and it feels very good, has normal compression and will work."


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