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Old 05-26-2017, 06:53 AM
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upallnight upallnight is offline
Join Date: Aug 2012
Location: Cook County
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Originally Posted by 80stech View Post
So clutch is working and compressor is turning when it's not cooling ? Maybe the variable displacement valve is sticking. I think you are going to need someone to check this for you.
I was under the impression that variable valve compressors were clutchless. Since the valve varies the displacement of the compressor, there is no need for a clutch. The compressor is always turning, but if ac cooling is not required, the valve varies the displacement to almost zero, so there isn't any drag on the engine. When ac is required, the valve increases the displacement of the compressor so that refrigerant is pumped from the low side to the high side thus providing the cooling effect requested.
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