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2000 GMC Sonoma Air Conditioning

Tiny
FACHORNJ
  • MEMBER
  • 2000 GMC SONOMA
  • 4 CYL
  • 2WD
  • MANUAL
  • 121,000 MILES
My air conditioning no longer blows cold, after about an hour or so it will "cool off" but it is no where near as cold as it was. I know in some older cars freon was used and may have to be re-charged after so many years of use. Also I can hear the compressor turning on and it still blows air fine, just not cold air. What do you think?

Thank you for the help,

Jason Fachorn.
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Friday, August 28th, 2009 AT 12:18 PM

1 Reply

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
First step is attach a good manifold gauge set and tack the readings of high and low sides, 35-40 on low and 150-200 is what you want to see, yours is most likly low.A/c systems do loose gas through the service ports and do need to be recharged every few years on some. Or you may have a leak. If your compressor cycles on and off frequently, you are low on R-134a.
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Friday, August 28th, 2009 AT 6:54 PM

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