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1999 Chevy Truck A/C not cooling properly

Tiny
DWSMITH43
  • MEMBER
  • 1999 CHEVROLET TRUCK
  • V8
  • 2WD
  • AUTOMATIC
  • 13,000 MILES
My a/c does not cool at all when idleing. It cools some what at low speed. Baffling part is that it cools perfect at highway speed. Engine normal temp. No bugs or obstructions on evaporater.
Friday, June 27th, 2008 AT 7:01 PM

5 Replies

Tiny
MASTERTECHTIM
  • MECHANIC
  • 4,749 POSTS
Not baffling at all mr smith. Replace your cooling fan clutch assembly and all your ac problems will be gone
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Friday, June 27th, 2008 AT 7:06 PM
Tiny
DWSMITH43
  • MEMBER
  • 6 POSTS
After you replied I went out and sprayed water on evap while it was running and sure enough it cooled like a dream. Thanks for your help. Next is a fuel pump thing, on my third in 18 months. "Next payday"
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Friday, June 27th, 2008 AT 10:23 PM
Tiny
MASTERTECHTIM
  • MECHANIC
  • 4,749 POSTS
Cool
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Saturday, June 28th, 2008 AT 6:24 AM
Tiny
DWSMITH43
  • MEMBER
  • 6 POSTS
Took advise from this site day before yesterday and changed out my fan clutch assy. Should I check the pressures. I bought the adapter to use my 134A guages from work. What pressures am I looking for. Engine runs cooler though. So it wasn't a waste.
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Sunday, June 29th, 2008 AT 7:53 PM
Tiny
MASTERTECHTIM
  • MECHANIC
  • 4,749 POSTS
30 psi on low side and about 150 to 200 on high side. Still cools fine at high speeds but not at idle. Let me know ab out those pressures.
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Monday, June 30th, 2008 AT 7:31 PM

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