If there is no voltage – a cycling switch may be bad, a fuse may be blown, and the system may not have enough refrigerant pressure to trip the low pressure cutoff switch that cycles the compressor.Īdvice, how-to guides, and car care information featured on and AutoZone Advice & How-To’s are presented as helpful resources for general maintenance and automotive repairs from a general perspective only and should be used at your own risk.If there is voltage – the clutch may be bad.If the clutch is not engaging and the system has refrigerant, use a voltmeter to check for voltage getting to the compressor.As you add more refrigerant, the gauge will hold steady, with the compressor running, and should hold at the recommended pressure. You will also see the low-side pressure on your gauge drop rapidly when the clutch engages, hit a point of too-low pressure, then disengage and the pressure will rise. If the clutch is engaging and disengaging once every few seconds, this is a sign of low refrigerant. Note: this is not the pulley, but the center piece that engages the pulley to the compressor shaft. With the engine running turn the A/C on max cool, set fans high, and make sure that the clutch is engaging on the compressor. When diagnosing an air conditioning issue, it’s easiest to begin at the compressor:
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