Air conditioner only works if bypassed

2002 LINCOLN LS
200,000 MILES • 3.9L • V8
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RETAS DEMOTTE
  • MEMBER
  • 1 POST
Auto shop says he replaced compressor hoses and charged system. A/C works if bypassed but not with controls and the computer need replaced.
Aug 1, 2018 at 11:17 PM
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ASEMASTER6371
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 52,796 POSTS
Good morning.

Do you mean he said the PCM needs to be replaced?

Did he verify this by watching the inputs from the low and high pressure switches?

How did he determine the reason for the failure of the PCM?

Roy
Aug 2, 2018 at 4:31 AM
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