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2001 chevy citation, the a/c just quit working. A hissing sound was heard but the system shows it charged. Also now when the a/c is turned on the car engine runs rough and the engine runs hot, yet has plenty of good coolant. Also when the a/c is turned on now there is a loud click instead of a quieter click. Any ideas??

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You may have a faulty high/low pressure control switch which is not cutting compressor function due to low pressure of refrigerant in the system. The hissing sound is caused by a lack of refrigerant passing through the expansion valve. The other thought I have is that the thermostatic expansion valve or your reciever drier may be clogged.

Posted on Jul 02, 2009

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Posted on Jan 02, 2017

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