Question about 2003 Toyota Corolla

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Ac compressor pump will not turn on even though it is showing it had a full charge

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AC clutch relay. It is located under the hood, marked M/G CLT. You can get one from rockauto.com for $11

Posted on Aug 23, 2010

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Posted on Jan 02, 2017

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2 Answers

2005 Sedona fully charged,compressor does not turn on


Normally you would check for voltage at the relay then the low pressure switch, then the compressor clutch.
With the system charged or the low pressure switch bypassed you should have 12 volts at the clutch and ground. You can also check the clutch with an ohms meter to see if the magnet is open.

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2002 saturn sl1 not blowing cold air from ac even though recharged


Is ac compressor even coming on? Did it work before the water pump was replaced? Do the radiator fan(s) come on when ac is turned on?

Jun 30, 2012 | 2001 Saturn L-Series

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I have a 2000 Dodge Ram 1500 that will blow cold and hot air for only a few minutes. After that is only ambient air temps. It is a 5.7 ltr, automatic with only one set of climate controls. The heater core...


you say it will blow cold and hot air for only a few minutes. You don't say but I assume you mean will blow cold a few min. when turned on AC max , blow hot only a few min. when turned to heater hot. Assuming thats the situation and you say AC charged and shows good on the low side -you should charge the AC to a full charge on the low side will cause problems with the AC air compressor kicking on and off. I suggest while the engine is running and turned to AC cold max watch the AC air compressor clutch to see if it does indeed kick on and off if so charge completely. As far as the heater make certain you coolant is all the way to the top and the best way to do this is when engine is completely cold remove radiator cap and fill completely and completely close cap then fill overflow container just to the cold level. That should fix your problem.

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My ac is blowing cool air only, it is at full charge


You need to turn off the button that say AC on it. You need to change the temperature and the fan adjustment. If you have the AC button turned on, the fans will blow cool air even though the heat is turned on.

Apr 17, 2011 | 2000 Jaguar S-Type

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Power steering stopped working, battery light came on, car overheated on a 2001 taurus: being told by mechanic that the air conditioner compressor needs to be replaced. Sounded to like the belt needs to...


unforutionatly your mechanic may be right if the ac compressor locked up it will eat the belt and make the other things not work like the water pump ,altanator,power steering.esay to check though remove belt see if you can turn the ac pump by hand.if you mechanic is worth his salt he will even show you this.

Nov 12, 2010 | 2001 Ford Taurus

1 Answer

Air compressor wont come on to to put in 134a


The AC compressor does not have to be running to charge the AC system, and the low pressure switch will even prevent the AC compressor from operating until there is sufficient pressure to operate the AC compressor without damaging it.

Start the engine and turn on the AC, then charge the system with the R-134a and as soon as there is enough pressure built up to trip the low pressure switch off, the AC compressor clutch should then engage and then finish charging the AC system.

May 31, 2010 | 1997 Cadillac DeVille

1 Answer

2005 Pontiac Sunfire A/C compressor always on when switch is pressed, never cycles on and off and even runs with temp control in full hot... any help? I was wondering if the compressor or pressure switch...


How do you know the AC compressor is always on?
It is always supposed to spin you know.
It is just that there is a clutch that lets the pulley freewheel on the shaft, and the compressor does not then spin even though the pulley is spinning.
But if you were very low on freon, it would also engage the clutch all the time as well. You need to put a gauge on the high side of the pump.

Apr 20, 2010 | 2004 Pontiac Sunfire

2 Answers

AC Wont charge after replacing components


whenever the ac system has been opened it should be hooked up to a vacuum pump designed to evacuate the ac system of any foreign debris and oil etc and after should be able to hold a vacuum to show that there are in fact no leaks then if all is ok at this point you can then charge your ac with the proper freon specified for you car when the pressure reaches satisfactory level the ac compressor will then cycle on you should not bypass the low pressure switch

May 30, 2009 | 1999 Chrysler Town & Country

5 Answers

Air conditioning clutch


check to make sure the a/c system is fully charged, if it is not the system will not turn on, if you need more help get back to me. please rate my fix as i strive to be the best

Apr 24, 2009 | 2000 Dodge Durango

1 Answer

A c starts off cooling good then compressor starts kicking in and


Several possible causes. Knowing the state of refrigerant charge would be helpful. Assuming it has a 'full' charge (full charge 680 Grams = 1.50 Pounds) Most common causes of AC problems:
1. Thermostatic switch (sensor) malfunction in the evaporator - allowing the evaporator to ice up. Check the vent temperature (using a cooking thermometer) to see if the temperature gets near or below freezing (32 Deg F.). If so, the thermostatic switch in the evaporator is defective. Replace it.
2. Refrigerant UNDER-charge. If the temperature does NOT get near freezing, then you need a set of AC gauges to check the compressor head pressure (High side) and the suction (Low side). High side pressure (nominal) is 229 PSI (+ - 20 psi) @ 2000 RPM. Low side (nominal) is around 20 to 40 psi. NOT common problems:
1. The magnetic clutch coil on the compressor... as it heats/warms up, the coil windings could be going 'open" circuit which would turn the compressor 'off.'
2. Compressor inefficiency (worn out).
3. Expansion Valve
4. Clogged Condensor

Mar 19, 2009 | 2004 Hyundai Elantra

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