Question about 2002 Chevrolet Silverado 2500HD

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How to replace a/c clutch cycling switch

Does the freeon leak if I replace the A/C clutch cycling Switch?

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The ac clutch control is normally the thermostat switch . It is located near the evaporator inside the car and has a small tube attached to the evaporator coils . It is normally electric so the removal of the thermostat should not affect the gas level

Posted on Mar 26, 2014

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Posted on Jan 02, 2017

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SOURCE: 94 Astrovan freon leak

most switches ive seen have a o ring

Posted on Apr 03, 2010

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2 Answers

A/c compressor clutch wont disengage when switch turned on but does when relay is jumped, tried changing relay but problem remains


Do you mean the clutch wont engage when switched on? If that is the case then maybe the system is low on refrigerant.
There should be a two wire low pressure cycling switch on the dryer/accumulator. Turn the a/c on and jumper that switch. If it works then you may be low on refrigerant or that switch is bad. Unless it was removed, there is supposed to be a shrader valve behind that cycling switch so it can be removed and replaced without loss of refrigerant (unless the shrader is leaking).

If it still does not work then it may be the controls. I can't get more specific as you did not give any info on the specific vehicle.

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1 Answer

A/c is not working freeon in the system also all relay has been tested, compressor has been tested all are good. so what can be the problem


Freon in the system does the A/C compressor cycle ? if it doesnt then its a switch problem ranging from a/c button to the low pressure cycleing switch, the most prominenet failure will be the low pressure cycle switch,Thats if its not cycling, Now if it cycles then your expansion valve will need to be replaced

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1 Answer

No cold air coming out of air condition just hot air


Check you ac belt under the hood is not slipping. Check that your ac clutch is engaging.
Check your freeon level.
It is possible you may have a freeon leak. The mechanics will use a dye to determine if you have a leak and where it is. The leak will be repaired and new freeon put in.

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The A/C on my wifes 97 Blazer is not working. I


do u have power to the AC compressor clutch cycling switch, this switch is in the low side,either in the larger of the two AC lines or in theround canister called the "Accumulator" under the hood, still think u have lost your charge,this year is prone to AC compressor front shaft seal leaks. below is a picture of the clutch cycling switch.

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1 Answer

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Could be, at low pressure cycling switch jump wire, switch screw into accumulor if compressor come on recharge a/c system, if not check fuse and relays and compressor coil.

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you will have to see with test light if you have power going to the ac compressor you either have bad compressor or low pressure switch

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My a/c clutch engages/disengages frequently sometimes.


your AC system is low on refridgerent charge, this is caused by a leak in the system, the most common cause on this car is the front shaft seal of the AC compressor on your engine, have the whole system twested for leaks and recharge with TYPE R134 refridgerent

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The ac blows air but its not cold. freeon has been added and has been charged.


it may just need a charge of refrigerant and be checked for leaking

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jumper the ac compressor cycling switch in the low side line or accumulator and see if system works. They stick and cause this problem.

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the system has a definite leak and should be fixed then the system should be recharged there is a pressure switch that keeps the clutch from engaging when the system is low on freon which keeps from burning up the compressor

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