What does the code PO645 mean - the A/C clutch relay circuit is open or shorted?

Tiny
SKSILVER
  • MEMBER
  • 1999 CHRYSLER SEBRING
  • 158 MILES
What is the a/c clutch relay circuit? Code PO645 on a 1999 chrysler sebring lxi
Saturday, October 6th, 2012 AT 2:13 PM

5 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,796 POSTS
The computer is trying to complete the command to turn on the ac and it cannot as it does not see a signal to ground.

The circuit has to be checked as to why there is no signal to the pcm

Roy
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Saturday, October 6th, 2012 AT 4:35 PM
Tiny
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Thank you very much, the air and/or heat hasn't been coming out of the vents very well. And a year ago it was looked at by a mechanic who said it just needed cleaned out, but the problem restarted about 6 months later. Thank you again.
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Saturday, October 6th, 2012 AT 8:49 PM
Tiny
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Would that relay cause the air or heat to not come out the vents very well? Or maybe it just needs recleaned again?
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Saturday, October 6th, 2012 AT 8:57 PM
Tiny
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  • MECHANIC
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No, that could be the blower motor itself.

Roy
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Saturday, October 6th, 2012 AT 10:18 PM
Tiny
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Thank you.
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Sunday, October 7th, 2012 AT 2:23 AM

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