Question about 1999 GMC Suburban

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A/C sporadic compressor. Bypassed high and low with paper clip. Pressures good has Freon. Clutch tests OK. Vehicle runs for maybe 10 min or some times 30 then A/C shuts down. Maybe A/C will fire up again after cools down, sometimes 10 min later. Changed out A/C relay under hood, no change. Battery, good voltage. 1999 GMC suburban 4 wh dr. 350 eng. New compressor 2 yr ago.

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I think that the problem is your A/C needs more freon134a it seems that when it has run for sometime the pressure gets too low and cuts out the LP switch

Posted on Apr 10, 2009

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This is just a suggestion but you should check to see if you have a thermostatic control switch in your evaporator this could be the cause if the intermittent problem.The switch is actually used tokeep your ac from freezing up i believe.

Posted on Mar 07, 2009

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I have a 8/94 Lincoln Town car with a 4.6 L engine. I'm having a problem with this vehicles HVAC system. There is no a/c clutch activation even though the system pressures are equal and there is enough...


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