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The air conditioner compressor doesn't engage when the switch is set. The belts are all in good condition and the compessor turns freely by hand. How do I test the circuit? Is there a fused relay and where is it?

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If your refrigerant level is low the A/C pump will not engage. I suggest you buy a can of R134a (if that's a newer model, you gave no year, model, or details) Get the can with the guage on it, about 25/30 dollars. When you begin to charge as directed, the pressure will turn the "low pressure switch" on and you will begin to have it function. Just did my truck and glory to G_d, I now have AIR.

Posted on Aug 21, 2010

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99 chrysler lhs air compressor won't work


unplug the low pressure switch in the air conditioner line near the dryer with air switched on , jump the connector with a short piece of wire to see if the compressor clutch engages. If it does your pressure switch is bad. If the pressure switch is good then there is a fuse near the compressor somewhere that may be blown. If it blows new fuse your clutch is bad.

May 16, 2017 | Chrysler Cars & Trucks

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2004 sorento squeals when start air conditioner


The air conditioning compressor is belt driven by the engine. The compressor has a clutch on it that engages when the AC is turned on. The compressor then puts more load on the drive belt. Likely the drive belt is loose, worn or may have oil on it. Hope this helps.

May 27, 2016 | 2004 Kia Sorento

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Engine quits when ac turned on compressor unplugged


Knowing make model and year would help. Most newer vehicles, 2000 and newer, will adjust the idle control up to compensate for the compressor engaging. Possible there is an issue in the idle air control valve or electrical circuit.

Mar 14, 2017 | 2003 Ford Focus

2 Answers

Air conditioning system freon


You'll need to have a mechanic check the system to see if it is low on freon, or if you have an electrical problem.

Jun 09, 2013 | 2008 Mitsubishi Galant

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The serpentine belt on my 1984 Buick Lesabre keeps breaking when turn on air conditioner or heater why?


Most likely you have a seized AC compressor. When you ask for AC or heat the AC clutch engages with the pulley wheel that normally spins freely when the AC is off. As the pulley wheel is no longer able to turn because of the seized compressor the belt will either slip or snap.

Sep 20, 2011 | 1984 Buick LeSabre

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The blower motor for the air conditioning doesn't come on. The compressor comes on. I ohmed the blower motor and it was good. I jumped the blower motor and it turned freely. With the control set 1 2 3...


> With the control set 1 2 3 4 it does blow any air,
? does NOT?
A common problem with this control is the failure of a stepped resistor which causes only the highest speed to still function since this bypasses the resistor.
Tracing the leads from the fan speed switch may help locate it.

Sep 04, 2011 | 1997 Honda Accord

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

I have a 1993 Chevy S-10 4.3L automatic. The heat won't shut off. It pours out regardless of the position of the climate controls. Coolant level and condition good. AC would work but. Thanks.


#46-12-03: AIR CONDITIONER BLOWS WARM AIR (REPLACE A/C DELAY RELAY) - (Apr 7, 1994) 999999995.gif REVISION: 04/14/94
THIS BULLETIN IS BEING REVISED TO CORRECT THE TRANSMISSION LISTED IN THE MODELS. ----------------------------------------------------------------------
SUBJECT: AIR CONDITIONER BLOWS WARM AIR (REPLACE A/C DELAY RELAY)
MODELS: 1994 CHEVROLET AND GMC TRUCK S/T PICKUP WITH 4.3 ENGINE (VIN Z - RPO LB4), 4L60E TRANSMISSION (M30) AND AIR CONDITIONER/MANUAL CONTROLS (C60); OR 4.3 ENGINE (VIN W - RPO L35) AND A/C (C60)
BUILT BEFORE THE FOLLOWING VIN BREAKPOINTS:
PLANT DIVISION VIN LINDEN GMC RK501034 SHREVEPORT GMC R8501199 SHREVEPORT CHEVROLET R8105893 LINDEN CHEVROLET RK103097
CONDITION:
SOME OWNERS MAY EXPERIENCE A CONDITION WHERE THE AIR CONDITIONER IS TURNED ON AND DELIVERS ONLY WARM AIR.
CAUSE:
THE AIR CONDITIONER COMPRESSOR MAY DELAY LONGER THAN THE "ORIGINAL DESIGN" INTENDED 12 SECONDS, OR MAY NOT ENGAGE, DUE TO THE POSSIBLE MALFUNCTION OF THE COMPRESSOR DELAY RELAY.
CORRECTION:
TRUCKS BUILT BEFORE THE VIN BREAKPOINTS LISTED ABOVE MAY NEED A NEW AIR CONDITIONER DELAY RELAY. REPLACE ONLY WITH 15990540 AIR CONDITIONER COMPRESSOR DELAY RELAY. SPECIFIED PROCEDURE IN SERVICE MANUAL NATP 9429, PAGE 1B-59. TEST AIR CONDITIONER OPERATION FOR DELIVERY OF COOL AIR.
NOTE:TO TEST FOR PROPER OPERATION, PUT THE A/C CONTROL ON THE "OFF" POSITION, START THE ENGINE, THEN PLACE THE A/C CONTROL IN THE "ON" POSITION. THIS SEQUENCE WILL PROVIDE IMMEDIATE ENGAGEMENT OF THE AIR CONDITIONER COMPRESSOR. WHEN THE ENGINE IS STARTED WITH THE A/C CONTROL ALREADY "ON", THERE WILL BE A NORMAL 15.0 SECOND DELAY FOR THE AIR CONDITIONER TO ENGAGE.
SERVICE PARTS INFORMATION:
P/N DESCRIPTION QTY
15990540 A/C COMPRESSOR DELAY RELAY 1
PARTS ARE CURRENTLY AVAILABLE FROM GMSPO.

Jul 29, 2011 | 1994 Chevrolet S-10 Blazer

1 Answer

Car overheating and ac is hot and have 0645 code


There is an electrically driven clutch on the front of the air conditioning compressor which engages when air conditioning is required The AC compressor has a fan belt driven wheel on the front of it. The belt turns this wheel all the time. When the a/c is off this wheel spins freely. When a/c is required the electrically driven clutch engages this spinning wheel to supply drive to the a/c compressor shaft. The 0645 code concerns a fault with this clutch.

Jun 16, 2010 | 2001 Chrysler PT Cruiser

1 Answer

A/c Does Not Work


Most likely the cause is low freon charge. Contrary to popular belief, an A/C system never 'loses' freon normally - this always means a leak but sometimes the leak can be so small that it is virtually undetectable.
Your A/C system has a 'low pressure' switch, usually mounted on the compressor, that shuts the compressor down to prevent damage when the freon's psi falls too low. To test your compessor: with the engine running you'll need to connect a wire to the positive battery terminal and one side of the switch and just touch another wire from the negative battery terminal to the other side.
If the compressor is OK, the clutch 'plate' will engage & spin when both wires are connected. Either way, you should have this done at a licensed garage as you probably don't have the proper tool to test & repair the system if you do find the problem.
If you decide to do this yourself, please be very, very careful not to get shocked (use thick wires with good insulation) and don't wear long sleeves or loose clothing as you will be working right near the spinning pulleys and belt(s). Good Luck!

Jul 21, 2008 | 2002 Chevrolet S-10

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