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Q: AC not working on 1993 Volvo 940

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The compressor is not engaging. When AC button is pushed. Where is the ac relay is located
in a 940 Volvo turbo
(1) Answer
I don't think there's a relay for the A/C Compressor, the power comes from the control head. I would consult a wiring diagram to be sure.
Verify you have power coming from the control head, I've seen several of them fail.