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2003 Touring backfires when I turn on A/C

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Old 09 Jul 2014, 07:11 pm
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Join Date: Dec 2012
Posts: 7
Default 2003 Touring backfires when I turn on A/C

Not sure what the problem is but when I turn on the A/c I hear a "thunk" coming from the rear passenger side. Louder if I am accelerating at the same time as turning it on. Also, the air is not as cold as it once was. Related problem maybe?
2003 PT Cruiser Touring Ed
140,000 miles.
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Old 09 Jul 2014, 07:18 pm
Obsessed Cruiser
Join Date: Sep 2001
Posts: 27,758
Default Re: 2003 Touring backfires when I turn on A/C

The "thunk" is your compressor kicking on but why from the rear is a mystery. Sometimes sounds can travel and even though you may think it's coming from the rear it's actually coming from the front passenger side where the compressor is. It also sounds like the clutch in the compressor might be having problems.
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Old 12 Jul 2014, 03:55 pm
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Join Date: Dec 2012
Posts: 7
Default Re: 2003 Touring backfires when I turn on A/C

I swear the noise is coming from the rear, but you're probably right. My hearing is not like it was especially after 40 years of factory work!
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