1999 Chevy Truck a/c not cooling properly

1999 CHEVROLET TRUCK
13,000 MILES • V8 • 2WD • AUTOMATIC
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DWSMITH43
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  • 6 POSTS
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.
Jun 27, 2008 at 12:01 PM
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MASTERTECHTIM
  • ✓Experienced Mechanic
  • 4,750 POSTS
not baffling at all mr smith. replace your cooling fan clutch assembly and all your ac problems will be gone
Jun 27, 2008 at 12:06 PM
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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"
Jun 27, 2008 at 3:23 PM
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MASTERTECHTIM
  • ✓Experienced Mechanic
  • 4,750 POSTS
cool
Jun 27, 2008 at 11:24 PM
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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.
Jun 29, 2008 at 12:53 PM
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MASTERTECHTIM
  • ✓Experienced Mechanic
  • 4,750 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.
Jun 30, 2008 at 12:31 PM
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