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Intermittent A/C issue

Tiny
DAN WEDDLE
  • MEMBER
  • 2007 VOLVO S40
  • 2.4L
  • 5 CYL
  • 2WD
  • AUTOMATIC
  • 70,000 MILES
Vehicle has digital A/C control but not climate control since you don't set the actual temperature.
The A/C compressor has recently started turning off and blowing warm air. Turn off for a while and it will come back on (so far).
I checked the pressures (nice spot for high side port!) And they are a little low but no so much to cause compressor to turn off (35/210 at 85 ambient temperature). The air gap of compressor clutch seems to be about.40mm.
I'll check to make sure there is voltage at the clutch next and go from there. Seems this compressor has wear issue with clutch.
Any other advice for troubleshooting?
Thank you!
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Friday, June 19th, 2020 AT 1:07 PM

1 Reply

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
I think you are on it. The fact that the compressor shut off and then back on, is either a high pressure issue or a clutch/compressor issue so I am sure you are on the right path.

I attached a chart that does show you are a little low on Freon but that is not going to cause it to shut off intermittently. Then the wiring diagram for you to test voltage when the compressor is off (when you think it should be on). If there is voltage and the clutch is off, then that is the issue.

Let us know what you find. Thanks
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Friday, June 19th, 2020 AT 4:35 PM

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