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Ac hissin at idle


kenc195
06-04-2012, 06:04 PM
1997 Passport 3.6 L... when AC is on and at idle, there is a hissing sound. Increase the RPM by a couple hundred and it get quiet. Added some refrigerant and it got better but came back soon. Also blows warm at idle. I Changed the compresser last year to a four seasons and hope thats not the problem again. Any ideas?

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