Question about 1993 Buick LeSabre

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A/C clutch does not engage when a/c is turned on. Do not have voltage to pressure switch

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  • keithkormann Dec 05, 2008

    a/c clutch doesnt engage..i have power at presure switch and tried jumping it and doesnt come on...i can feed power to it at the compressor and it comes on and gets nice and cold.....

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When you jump the low pressure switch does the compressor run?

Posted on Oct 20, 2008

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2 Answers

Hi my name is leo and I have a 2002 jeep Cherokee Laredo a/c clutch will engage


Faulty low pressure switch , Google it to see how to replace, or you an unlucky it and run a jumper wire between the terminals/ But beware- bypassing the low pressure switch can ruin the compressor if it gets low on freon.

Jan 25, 2015 | 2000 Jeep Grand Cherokee

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Where is the ac clutch breaker at I have changed the low pressure switch already


Do you have voltage at the low pressure switch when the a/c system is on? If not, find the fuse or breaker at the fuse panel.

If there IS voltage at the switch but the clutch is not engaging, YOU DO NOT HAVE ENOUGH REFRIGERANT IN THE SYSTEM.

Jul 18, 2014 | Cars & Trucks

1 Answer

2001 f150 a/c compresser clutch wont engage


are you getting power to the clutch compressor? if no power check the "wide open throttle" relay. the relay can go bad and disrupt power to the clutch. also check the voltage on the pressure transducer to make sure it is reading line pressure correctly, will need a scan tool to access this info.

Jun 17, 2012 | 2001 Ford F150 Styleside SuperCrew

1 Answer

2000 Buick LeSabre a/c clutch will not engage. Fuse is good, can't tell if micro relay is ok or not, no power at compressor clutch plug when a/c is turned on. Are there other switches (full throttle...


There is a low refridgerant pressure switch, and a high refridgerant pressure switch. Either can cut the power to the clutch. You will have to check the pressure in the system to know for sure.
The electrical part in the clutch could be bad. You could run jumper wires to the clutch connector to see if it will engage. If not, its the clutch. If it does engage, then more than likely your just low on refridgerant, and possibly have a tiny leak.

Aug 29, 2011 | Buick LeSabre Cars & Trucks

1 Answer

Compressor isnt turning at all dont know if i need new one or if i need new clutch how can i tell


The pulley on the compressor is always running when your engine is running, but the only time
it compresses the freon is when the clutch engages, if the compressor's pulley was not turning,
it would have already snapped a fan belt or your serpentine belt. voltage runs from your fuse box
thru your air condition switch on your dashboard to a low pressure switch that is located at the
accumulator a long cylinder,close to the firewall under the hood or close to the condensor, front
of the car. the switch detects freon pressure in the accumulator, if there is freon pressure, the switch
will stay closed and allow voltage to go to the compressor clutch to engage it and compress the freon,
if there is no freon pressure the switch will open, and there will be no voltage to air compressor, its a
saftey switch to keep your compressor from getting damaged.its possible that the switch could be bad
it may not have voltage at the switch, or it may be open because there is insufficient freon pressure.
check and make sure there is freon in the system.check for voltage at the low pressure switch if you have freon in your system and voltage at the pressure switch, set your ac on high, pull the molex off
the switch, and jump it out with a jumper wire, if the clutch engages and your car starts to cool, just
replace the switch. if the clutch engages but does not cool, then your ac system has some blockage
in the lines. if the clutch does not engage at all then it would be the compressor clutch. good luck!

Aug 03, 2011 | Buick Century Cars & Trucks

1 Answer

Air conditioner not working on 1993 bonnevile, compressor not engaging, charge good, power at low pressure switch, switch is closed, need to know what turns a/c relay for compressor clutch on, clutch...


the ECM supplies the ground circuit for the a/c clutch. the high pressure switch also needs to be closed to engage the clutch. when the low pressure switch and the high pressure switch are closed that completes the power circuit to trigger the relay.then the power on the #30 terminal can connect to the #87 terminal to send power to the a/c clutch.

Aug 02, 2011 | Pontiac Bonneville Cars & Trucks

1 Answer

Compressor will not engage on 2001 Impala? Where is low pressure switch located on 2001 Impala


It is located by the accumulator or dryer , a long canister shaped part, that will

have a pressure switch attached to it, and a two wire molex, if there is freon pressure

in the cannistor, the switch will close and send voltage to engage the clutch on

the compressor, if there is no voltage there the clutch will not work and you may

have a blown fuse or bad switch on your dashboard. i would check for voltage

at the pressure switch 1st, if its there, pull the molex off , jump it out and see if

the clutch engages. if you have power and you jump out the molex and the

clutch does not engage, you could have a bad clutch or bad compressor.

if it does engage, just replace the pressure switch, if you do replace it, make

sure to lube the seal with pag oil. good luck!

Jun 28, 2011 | 2001 Chevrolet Impala

5 Answers

My ac compressor on my dodge 2500 want engauge?


This could be a few things. The freon could be low, one of the switches (high or low pressure) could be bad, or you could have a bad compressor clutch. You can test the clutch by checking for battery voltage and ground at the two pin connector with the A/C on if you have both power and ground, then the clutch is bad. You really should start by hooking up pressure gauges to the A/C ports to check the pressures, and these vary depending on ambient temperature and whether the A/C compressor is engaged or not. I am willing to bet that the freon is low though and may be just as simple as recharging the system.
Hope this helps. Good luck!

Apr 09, 2011 | 2006 Dodge Ram 2500

1 Answer

2000 chevy truck 5.3 liter. air conditioner works 10-15 min then stops. clutch and clutch pressure switch good, freon level good, batt and alternator good??


After the clutch disengages ( when it's not suppose to )check the voltage on the + output terminal on the clutch relay, (inside the fuse box under the hood) if you have voltage there, check the voltage at the clutch, if you have voltage there too, its the clutch. The clutch gets worn and will engage when cool,but fails after heat builds up. Check this by tapping the face of the clutch with the ac on, if it's simply a worn clutch it will likely engage for a while.

May 20, 2010 | 2000 Chevrolet Silverado

1 Answer

Air conditioning clutch will not engage. No


check if a/c has a full charge =if ok check pressure switches you might have a defective one.

Jul 12, 2009 | 2003 GMC Sierra 2500HD

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