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'92 Celica GT, A/C clutch won't engage

stickpony on Sun August 22, 2010 5:15 PM User is offline

Year: 1992
Make: toyota
Model: celica GT
Engine Size: 2.2L
Refrigerant Type: 134a
Ambient Temp: 95
Pressure Low: 35
Country of Origin: United States

hey everyone, i am a newbie on the forum. i am Ron, and I own a 92 Celica GT with 32,000 original miles on it. the car has been garage kept and is my weekend driver. the car is all stock with the exception of a cold air intake.. yesterday the A/C stopped blowing cold on me. I have a background in computers, so i figured i could troubleshoot this myself, but i have found the wiring diagrams very confusing. Anyways, i thought i would start with the easy stuff, such as testing the A/C clutch relay, fuse, and the A/C clutch itself. All three test good. i tested continuity across the 10 amp fuse under the passenger's side kick panel and it tested good. i pulled out the a/c clutch relay in the engine bay relay box by the compressor, put 12 volts to the coil side, and it would click on. just to be sure, i swapped out another spare relay i have for when the door motor went out on me, and the relay is the same part number, so i tested it, plugged it in, and still no clutch engagement. now.. i tested the clutch by jumpering pins 3 and 5 on the relay box, and the clutch engages and the a/c cools the car. the pressure on the low side is 35 psi with the clutch engaged.

so what do i test now? the relay is good, the fuse is good, and the compressor is good... what other components will cause the clutch to not engage, and how do i test them??

thanks in advance for the help


mk378 on Sun August 22, 2010 6:13 PM User is offline

That car probably has an "A/C Amplifier", it is intended to drop out the clutch if the compressor does not rotate at the proper rpm. (seized compressor, loose or broken belt, etc). The amplifier units are prone to break down. Maybe it can be repaired by prying it open and resoldering the circuit board inside.

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