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Chevrolet cobalt air conditioning

2008 chevy cobolt compressor won't come on unless I disconnect the batterie leads & wait a while before reconnecting them or when I hook up scan tool under function tests I can command relay on & compressor comes on & the ac on & off button will work until you cycle the key/ remove key from ign completely. then after restart button illuminates but doesn't make the compressor engauge.

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Have you put a set of a/c gauges on the car to see if there is enough Freon in the system? It sound like low pressure switch is kicking compressor out.

Posted on Jun 14, 2014

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SOURCE: Air conditioning compressor not getting power on 96 Chevy Tahoe

Freon is what you are missing, our more specificly a refigerant charge that exceeds 45psi on the low side pressure line. This system has two pressure switches, a high side cut-out switch mounted on the rear of the compressor, and a low side or pressure cycling switch on the suction line.
Jump the low side switch contacts to ensure the electronics are sound for this system. If the compressor cycles, you know the system is low on a refrigerant charge. Turning on the AC is a request, and certain criteria must be met before the system operates as designed. Good luck

Posted on Mar 12, 2010

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