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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Posted on Jan 02, 2017

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2006 Jeep Liberty ac not working,fuses are fine,relay good replaced low and high pressure switches refrigerant level is good still won't work


Check for battery voltage on the dark blue/yellow wire in the connector at the AC clutch with engine running and AC on. If no voltage, yank the AC relay and check for battery voltage on terminal 86 in the relay socket. If no battery voltage on that terminal, check fuse 21. If yes, check for ground on terminal 85 in the socket. If no ground, then PCM isn't commanding the AC clutch on. Check for voltage on the dark blue/yellow wire at the low pressure switch and good ground on the black wire. The PCM provides power to the low pressure switch which then goes to ground. The PCM is looking for a large voltage drop if pressure is above 34-38 psi. If pressure is below that, the switch will be open, so the PCM won't see a voltage drop and will prevent AC clutch operation. The high pressure switch should be closed at pressures below 270-330 psi

Nov 30, 2017 | Jeep Cars & Trucks

1 Answer

No power to ac compressor 96 gmc k1500


faulty relay, excessive pressure in ac system
low pressure in ac system
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Jun 14, 2017 | GMC Cars & Trucks

1 Answer

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


ac compressor clutch coil open or short. wire cut or open to ac clutch.2 wires one is ground the other power, remove connector ac compressor then probe with test light between the two wire

Aug 05, 2013 | 2003 GMC Sierra 1500

2 Answers

2005 Sedona fully charged,compressor does not turn on


Normally you would check for voltage at the relay then the low pressure switch, then the compressor clutch.
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

1 Answer

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 ?
You have a low pressure switch that should be closed and a high pressure switch that should be closed to put power to the compressor clutch. If the freon pressure drops below 20psi the low switch opens, if it goes above 300 psi the high switch opens.

Jul 25, 2012 | 1997 Ford Explorer AWD

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Have no power to the ac compressor. all fuses and


SOUND LIKE AC COMPRESSOR CLUTCH COIL IS OPEN.ITS GETTING POWER YOU HAVE A OPEN COIL CIRCUIT.

May 27, 2010 | 2002 GMC Yukon Denali

1 Answer

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?


the fuel pump runs off the engines oil pressure switch upon starting. when the oil pressure is up to normal psi the fuel pump relay takes over until you shut the engine off.

Mar 03, 2010 | 1995 GMC Sierra C1500

2 Answers

No voltage getting to A/C Compressor. freon OK


The a/c relay or pressure switch,The relay is in the fuse box under the hood,the pressure switch is on the a/c line near the accumulator

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.

Jun 28, 2009 | 1999 GMC Sierra

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