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AIR CONDITION COMPRESSOR COMES ON ALTHOUGH SWITCH IS OFF

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AC COMPRESSOR CIRCUIT HOT ONLY WHEN THE IGNITION SWITCH IS IN THE ON POSITION.YOU HEAR THE FAN BLOWER MOTOR.IT HAS A BAD RELAY.BECAUSE BLOWER MOTOR CIRCUIT REMAINS HOT WHEN ENGINE OFF.

Posted on Sep 07, 2010

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Posted on Jan 02, 2017

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1 Answer

Just replaced ac compressor and still not working. replaced a relay also. What would keep itfrom coming on?


Could have a faulty low pressure switch.
The low pressure switch is located on the air conditioning line in the right rear of the engine compartment near the firewall.

The low-pressure switch in your air conditioning system is used to interrupt power to the compressor when the low side pressure drops below 25 psi. This prevents freeze-up of the system and possible damage to the compressor. When the switch is faulty, the symptoms of freeze-up, or no compressor function, will be present. Replacement is straightforward, but requires the removal of refrigerant from the system.

Jul 03, 2015 | 2003 Kia Sorento

2 Answers

I have a Mazda Tribute 2001. The Air conditioning all the sudden stopped working. In several occasions if we left the AC on for too long we heard a loud noise coming from the belts. Can it be a fuse or...


It sounds like your air conditioning compressor or air conditioning clutches have gone bad the solution is to have rebuilt (or buy a rebuilt)air conditioning compressor. Do not attempt to work on thr compressor yourself unless you are certified in air conditioning, gas in system can kill you if you breeth it in.

Nov 24, 2010 | 2001 Ford Escape

2 Answers

The air conditioning in my 2005 T&C stopped working. Right before it stopped there was a "burnt" smell coming through the vents. What happened?


No air coming from air conditioning vents
  1. Check the air conditioner fuse and replace as necessary.
  2. Air conditioner system discharged. Have the system evacuated, charged and leak tested by an MVAC certified technician, utilizing approved recovery/recycling equipment. Repair as necessary.
  3. Air conditioner low pressure switch defective. Replace switch.
  4. Air conditioner fan resistor pack defective. Replace resistor pack.
  5. Loose connection, broken wiring or defective air conditioner relay in air conditioning electrical circuit. Repair wiring or replace relay as necessary. Air conditioner has a smell when used
    1. The air conditioner evaporator drain hose is blocked or partially restricted, allowing condensation to build up around the evaporator and drainage tray. Clear the drain hose where it exits the passenger compartment.
    2. Check compressor clutch wiring, electrical connections and compressor clutch, and repair or replace as necessary.

Oct 10, 2010 | 2005 Chrysler Town & Country

2 Answers

Compressor doesnt run.


There is a pressure switch on the accumulator. The compressor cyles according to the low pressure reading at the accumulatror. If there is low refridgerent pressure the switch stays "OFF" and wont turn ther compressor on. Whan a system is low, there will be rapid cycling of the compressor, (on and off every few seconds). When the system is charged with the correct amount, the pressure is related to the temperature of the refridgerent. The compressors are common to leak. So it it doesnt leak, or make knocking noises, the compreesor MAY be good, but a pressure gauge will tell you if the compressor is good or bad. If you keep having to charge it, thats bad, and there is a leak. You will need to find and repair the leak, replace the drier (accumulator) , and recharge the system.

Nov 09, 2009 | 1997 Ford Explorer AWD

1 Answer

When I turn my vent selector to defrost on the far right (air con off)the air conditioning comes on. The dash vents will blow ambient air, but defrost setting blows air con. Any ideas?


It's normal for the A/C compressor to come on with the defroster to dehumidify the air so the windsheild won't fog up under humid conditions. You can still control the air temp. out the vents with the temp. select switch.

Jul 19, 2009 | 2005 Jeep Wrangler

1 Answer

I have a 1999 GMC 3/4 ton truck. My air conditioning doesn't work


if it is low on freon the compressor will have 0 volts becuase the low pressure switch on the evaporator isn't triggering...if you have freon then replace the low pressure switch...take a small piece of wire and disconnect the low pressure switch and jump the two sides of the plug together...compressor should come on

Jun 04, 2009 | 1999 GMC Sierra

2 Answers

Air conditioning controls


Sounds like a bad switch.

Dec 15, 2008 | 2004 Mazda 6

1 Answer

1994 honda accord lx


is it part of the same harness? have you connected the one you can see and tried it? the compressor plug is usually hidden but you can get to it

May 24, 2008 | 2004 Honda Accord

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