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No power to A/C compressor, fuses all good, jumped hi and low side sensor still compressor doesn't engage.

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Jump a hot wire to the compressor to make sure the clutch coil is still working.

Posted on Jun 01, 2010


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2004 suzuki aerio ac compressor will not engage. Compressor is not locked up,relay and fuses good, power at plug on compressor.,tried to jump low pressure switch, good freon

Tap the front of the A/C compressor and see if it engages, if it does the spacing in the magnetic pickup is off. If it doesn't then you have a bad switch either high side or low side of the compressor lines.

Aug 20, 2014 | Cars & Trucks

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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,
Hope this helps let me know what the outcome is. Good day.
I have enclosed a picture of the switch and dryer to help you locate it.If you jump the terminals

Mar 23, 2012 | 1995 Chevrolet Astro

1 Answer

Air conditioning compressor not getting power on 96 Chevy Tahoe

Freon is what you are missing, our more specificly a refigerant charge that exceeds 45psi on the low side pressure line. This system has two pressure switches, a high side cut-out switch mounted on the rear of the compressor, and a low side or pressure cycling switch on the suction line.
Jump the low side switch contacts to ensure the electronics are sound for this system. If the compressor cycles, you know the system is low on a refrigerant charge. Turning on the AC is a request, and certain criteria must be met before the system operates as designed. Good luck

Mar 12, 2010 | 1996 Chevrolet Tahoe

1 Answer

A/c compressor engages intermittently

Check the connections on the plug going to the compressor clutch and on the pressure switch on the low side. Also check the gap on the clutch. It may be too wide after where to engage correctly. Good luck.

Jul 23, 2009 | 1996 Ford Contour

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The compressor is not engaging on 96 pontiac transport van

Check wires going into it from harness.. make sure there is no break.. If not have compressor checked at autozone or advanced auto.

Jul 04, 2009 | 1994 Pontiac Trans Sport

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1996 Buick LeSabre AC Stopped Working

The first thing to check is if there is enough gas. The compressor will not work when the gas is low. There is a small inspection glass on the line. This needs to be clear. If you see streaks or bubbles means the gas is low. Never mind the pressure or wiring for now, Add one can of gas and this should get that first part done.

Jun 29, 2009 | 1996 Buick LeSabre

2 Answers

Can't get clutch to engage on air contioner.

Best bet is to recharge the system, and check your fuse blocks. You can purchase a recharge kit for approx. $30. Ensure that your fuses are good, and check the wiring for a short.

Jun 01, 2009 | 1992 GMC Sierra

1 Answer

Cannot find relay center in 1990 corvette

check the low side switch located on the ac receiver drier for 12 volts if so jump it with a paper clip if the compressor comes on then the relay is good if not the relay is in the fuse junction box under the hood.Most likely the pressure sensor.

May 23, 2009 | 1990 Chevrolet Corvette

1 Answer

1994 subaru legacy 2.2 liter, a/c compressor will not engage, fuse is good, fans turn on, but the compressor clutch does not engage.

two things stop the compressor from engaging,
A bad relay and the low coolant switch.  Sometimes to recharge the system you need to jump the low coolant switch.  Good luck

Apr 24, 2009 | 1994 Subaru Legacy Outdoor

1 Answer

The a/c Compressor Does not turn on.

There is also a low pressure switch that is incorporated into your AC system. If you have lost to much R-134 the compressor will not engage. This is to protect the compressor so it does not seize up from lack of oil. Your AC system also has ester oil in the system to lubricate the O rings and seals to keep them soft so they seal. You can jump the pressure switch to override the low pressure. If the clutch on the compressor engages then you have a low charge in your system. Or, you can place a manifold gage set on the low and hi side of the system to see what pressures you are running. If you don't know anything about head pressures then don't attempt this process. Good luck.

Mar 12, 2009 | 2001 Ford Ranger Regular Cab

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