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Old 03-15-2012, 04:00 PM   #1
Join Date: Mar 2012
Location: Miami, Florida
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ahh codes!!

Hi has anyone dealt with code P0645?
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Old 03-15-2012, 05:08 PM   #2
Join Date: Mar 2012
Location: Miami, Florida
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I tried changing the relay, but that didn't work. The AC blows cold but it switches between the main vents and the defrost all on its own.

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Old 03-15-2012, 05:21 PM   #3

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I assume that you have an older Jeep with a vacuum control system for A/C. Check for a vacuum leak, switching to defrost is a telltale sign of that. I think I saw several threads on this possibly in the TJ forum that can help you on where to look.
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Old 03-15-2012, 05:23 PM   #4
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Actually i have an '06 2.4 6 speed. But thanks, i will check out the forum!
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