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What does it mean to clip the wire from the pressure switch and jump it? Molson02536

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If you are referring to jumping across the pressure switch on an air conditioning system I recommend you don't do that. Other pressure switches are there for protection of the systems they serve. You can temporarily jump any pressure switch simply by using a short piece of wire and joining the two plug terminals for whichever switch you are working on Don't clip (cut) any wire or if you intend to ever re-connect that item you cannot.

Posted on Jun 24, 2009


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My 1998 Chevrolet Silverado will not take freon but the air condition does not blow cold air

Not enough info.with the compressor running and the charge line on the low pressure service port( the big line)it should charge. Be sure the compressor is running. If it's not: There is a low pressure switch in the big line. to check it disconnect the 2 wire connector, use a paper clip to jump between the 2 wires. If the compressor runs either the switch is bad or the pressure is not getting into the system at the fill port

Jun 15, 2014 | 1999 Chevrolet Silverado 1500

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1995 chevy suburban headlights won't come on but running lights work (headlights previously worked). No high or low beams, no high beam indicator light. Bulbs seemed to be ok, fuses seem to be ok....

Common for the wire harness on the switch to go bad. Inspect the wire harness where it clips on to the switch and look for any signs of damage.

The plastic heats up from the current running through the switch and causes it to melt and then you loose connection caused from melted plastic between the contacts from the harness to the switch.

There is a upgrade to the headlight harness which is larger then the ones that came with the Suburban to address this issues. You can get them at the dealer or NAPA i believe.

Good luck and keep us posted. Thank you for using fixya and stay safe.


Oct 24, 2011 | 1995 Chevrolet Suburban

3 Answers

Replaced the ac compressor but now no power to compressor but have power to low and high pressure switches. checked relay under hood, relay and fuse in cabin. what am i missing?

Put a jump wire in the high pressure switch plug. If the compressor works. replace the high pressure switch. Let me know and we can go from there.

Aug 22, 2011 | 1999 Ford Expedition

1 Answer

My ac is not working in my 93 buick lesare my father thinks it might be the low pressure sensor when he tested it there was no power coming out

you can jump the compressor with a paper clip bent into a u shape to see if it willl run if your refrigerant is gone, jump it at the low pressure switch across the wiring harness.

Aug 09, 2011 | 1993 Buick LeSabre

1 Answer

2001 Ponitac grand am. my air conditioner will not blow cold air. Its not the compressor and it has freon in it

low pressure switch is bad unplug jump across wires wit paper clip or such and see if it kicks in just test cant run that way replace switch /check relays

Apr 27, 2011 | 2001 Pontiac Grand Am SE

2 Answers

How do you jump a/c compressor so it will take the freon?

The interuptions in compressor engagement is due to low side drops which is controlled by the pressure switch mounted on the low hose or large metal accumulator on the passenger side. Low side hoses are larger and the accumulator is on the passenger side engine compartment...a paper clip works fine jumping this low side pressure switch out until freon pressures increase enough to keep compressor running to accept freon.

Jul 19, 2009 | 2000 Dodge Stratus

2 Answers

A/C Works Intermittently 2000 Chevy Blazer

Disconnect your high pressure switch when the compressor is not engaging and stick a paper clip in the wiring harness.. thus jumping both sides of the wires.. If the compressor engages then you know its a faulty pressure swicth.

Jun 26, 2009 | 1998 Chevrolet Blazer

1 Answer

A/c blow hot air then cool air been doing this about two weeks now.when compessor turns on shakes whole car. and turns off and on every 5 to 10 secs a/c never gets cold i just filled it with feron and used...

Just to make sure you have the right reading, the low side should be 30psi to 50 psi and the high side should be 150psi to 200 psi, Any other readings will give you poor a/c performance and if it's to high your going to have system damage. The other thing to is your a/c pressure switch may be bad and that's along the low pressure hose or on the accumulator (Air Dryer) It looks like a oil pressure switch with two wires clipped on to it. If that has gone bad it will give you the same on, off or stay off all the time. You can un clip the wire from the pressure switch and jump it and see if the compressor stay's on, if it does. Replace the switch and you can do it fast enough that you won't loose that much R134a. If your still having the on, off with the jumper wire to the pressure switch, replace the a/c relay. Good luck and hope this helps, keep me posted, be glad to get you running cool again.

Jun 24, 2009 | 2005 Chevrolet Cobalt

2 Answers

I need to know how to jump the ac low pressure to get my ac compressor to come on.

If you look on the low pressure side of the AC system you will see a plug that is incorporated in to the line. It will have two wires leading to it. Remove the plastic clip that attaches the two wires to the sensor and use a short piece of wire to connect the two terminals in side the plug by putting the ends into the cap. This will bypass the low pressure sensor and allow the AC clutch to engage and begin to cycle again. Remember this low pressure switch is there for a reason. If you don't add more r-134 to the system and allow the AC compressor to cycle you will destroy the compressor. You need to charge the system when you bypass the low pressure switch and get the system up to full charge status and reconnect the switch.

May 24, 2009 | 1995 Chevrolet Camaro

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