Question about 1996 Chevrolet K1500

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Ac pressure switches for 96 gmc 1500

Is one normally open and the other normally closed , pressure is fine [ fuses,relays,compressor] No voltage at compressor& both switches are open.both dash lights are on&blower works

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BY PASS THE SWITCH AT THE ACUMULATOR IF WITH CAR AND A/C RUNUNG IF COMPERSSOR TURNS ON THEN YOU SYSTEM IS LOW IN REFIGERANT OR THE LOW SWICHT NOT GOOD WITH PRESUER LOW SWITCH IS NORMALLY CLOSED

Posted on Jun 01, 2008

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1999 GMC air cond. AC clutch wont engage. system is charged. relay, fuze,and low pressure switch are replaced.


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The low pressure switch opens when the pressure drops below 20psi, and the high switch opens when the pressure is above 300psi.

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With the system charged or the low pressure switch bypassed you should have 12 volts at the clutch and ground. You can also check the clutch with an ohms meter to see if the magnet is open.

Aug 16, 2012 | 2005 Kia Sedona

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No current to ac compressor


A mechanic would start at the compressor and work back.
Did you jumper the low pressure switch, or the relay, or put power directly to the ac clutch ?
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We just replaced the fuel pump on my 96 gmc 1500. and it has no power going to it, as it did before... it has an inline fuse. wheres the fuse on it?


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1 Answer

Sounds like the some issue I have with my Mom's 96 Cav. No Cmprsr


I would check the freon level in the AC system. The computer looks at the voltage from the pressure switch in order to activate the compressor clutch. If the voltage is not in the right range the computer will not turn on the compressor and in turn will not turn on the cooling fan. It is set up this way in order to prevent damage to the AC compressor. I would almost bet that the system is low and may have a small leak. Your local mechanic can check it for you and correct the charge level as needed.

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No voltage getting to A/C Compressor. freon OK


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Jul 29, 2009 | 1995 Chevrolet K1500

1 Answer

Can some post the 1999 gmc sierra wiring diagram


you don't have enough pressure in your system. odds are you have a leak someplace and the factory installed a saftey switch to keep the ac from running when there is no pressure. This way you don't end up burning up your compressor.

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