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There is a relay on the top of the compressor that allows the clutch to engage. Check to see if it is bad by removing the relay and use a wire as a jumper while the car is running to see if the clutch engages. If the clutch engages once the jumper is in place then the relay is bad it cost under twenty dollars to replace.

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Q: AC in 95 Mustang 38L stopped working there is pressure in the system no leaks but compressor doesn't kick on How do you troubleshoot this?
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