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There are many reasons why a compressor can fail, including inadequate voltage to the clutch coil, loss of refrigerant charge, and contamination.

However, we also see compressors returned that are fully functional.

Before you pull the compressor from the vehicle and file a warranty claim, take these four steps to confirm that it really is a goner:

1. Is the compressor rotation smooth?

2. Is the coil receiving more than 11.5 volts?

3. Is the coil resistance between 2.8 and 4.4 ohms?