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I had an ac compressor put on a 06 expedition. I have jumped the low pressure switch and compressor still will not engage. Pls help.

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If you HAD a shop work on the A/C System

WHY DOES IT NOT WORK PROPERLY
& why have you not taken it back?

Why would an 8 year old vehicle have a failed compressor?

I'm familiar with the expedition

This is just a chat room & there is no data base to go to
for wiring diagrams or any ties to FixYa-- to help you

What are you trying to do & why,if you paid for work to be done
properly, you shouldn't have to check up on their apparent sloppy,
whatever

Today's vehicles are not like the 1980's or before, where you could
jump things,as a result of all the electronics

You have a the DATC A/C system

Posted on May 11, 2014

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Posted on Jan 02, 2017

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SOURCE: A/C compressor clutch won't engage, system won't cool

Your system might be low on freon. Get a kit with a hose that has a gauge on it so you can see if you are in the "Good" range. The cycling switch won't close unless there is enough freon in the system. You can temorarily jumper the connector for the cycling switch to see if the compressor will come on. If it does, you are low on freon for sure. Do not let the compressor run for more than 15 - 30 seconds with it jumpered.
report back results.

Posted on May 21, 2009

  • 14036 Answers

SOURCE: 2000 Ford Taurus AC compressor not working;

if compressor clutch dont kick in .it has a open in clutch coil.

Posted on Jun 01, 2009

  • 1 Answer

SOURCE: 1992 gmc c1500 ac compressor relay location

I pulled this from another web site
"The AC clutch relay is located inside the cab on a metal bracket that is easiest to see when you remove the glove box compartment.

The relay is on a metal bracket bolted to the top of the plastic air box, forward and to the center of the dash from glove box.

There are three relays in a row on that bracket. The AC clutch relay is the end one closest to the driver’s side."

Posted on Aug 18, 2009

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1 Answer

Where is my a.c. compressor replay fuse at for a 2000 montero


It is doubtful the fuse is an issue, check the refrigerant charge in the AC system, if it is low the compressor will not engage. You can jump the low pressure switch to turn on the compressor, that will verify the electrics are all ok. The switch is located in the low pressure AC line from the compressor on the engine, it is the larger of the 2 lines coming from the AC compressor.

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Kelly,Trouble shooting forum links below, the 3rd video show which contacts to cross to get AC clutch to engage.
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most likely the ac compressor will not engage because it needs a freon charge.The simple way to tell if that is why without having special equipment is to find the pressure switch located on the low pressure line and jump the switch with a peice of wire. if the clutch engages when you jump the switch then you need to charge the ac with 134 a freon

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Ac does not engage


Most vehicles have a low pressure switch that prevents the compressor from engaging so as to prevent damage to the compressor. You need to place a gauge set onto your AC to read the high and low sides of the system. Probably have lost enough gas(R134) over time to prevent the compressor from engaging. You can jump the pressure switch to check it with a simple jumper wire.

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1 Answer

A/C compressor on 95 astro van does not engage at all.


There are a few reasons for the compressor not engaging. Lets start with the most common. low ac gas.A bad clutch on the compressor.Blown fuse.
Let is start with testing for low gas. (134a freon).Locate the dryer. this is on the passenger side of engine compartment. it looks like a tall cylinder, on the top side you will see a switch. unplug switch connector and jump the two terminals in connector with a piece of wire, this is the low pressure or cycling switch. you will be completing the circuit by jumping a wire across the terminals.If the compressor turns on when connectors are jumped then you are low on gas and the system needs recharging.
If the compressor does not urn on then check all fuses, if fuses are good then the next step is to go to compressor and test for power and ground. If you have power and a good ground on the connector to compressor then compressor clutch is bad.A bad clutch will some times blown fuses, so if you replace the fuse because it was blown and it blows again then clutch is bad.
Another test that will help is when you remove the connector from the cycling low pressure switch , test the connector. one wire on the connector should have power when ac is turned on,
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I have enclosed a picture of the switch and dryer to help you locate it.If you jump the terminals

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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.

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