A/C does not blow air cooler than 70 degrees

Tiny
KJ MCCLAM
  • MEMBER
  • 1999 CHEVROLET SUBURBAN
  • 5.7L
  • V8
  • 4WD
  • 260,000 MILES
The SUV has rear air and the air conditioning was blowing at about 70°. A mechanic has replaced the compressor three times, the evaporator dryer, orifice tube, condenser. Even tried a heavier fan clutch. After replacing these items The low pressure is still at 70 and the high-pressure gets up to 300. All 134 levels are correct. The mechanic also replaced the heater cores in the rear end the expansion valve in the rear. The mechanic is supposed to be a air conditioning specialist, but unfortunately he has given up he says there is nothing else he can do. Air condition still blows at about 70 degrees.
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Thursday, September 13th, 2018 AT 6:06 PM

1 Reply

Tiny
ASEMASTER6371
  • EXPERT
Good morning.

Is the low side at 70 lbs or is the temp at the vents 70 degrees? A bit confusing in your question.

The low side should be 25-35. Above that the Freon is flooding the EVAP and it will not cool properly.

The high side is way high. It should be two times out air temperature plus 15%.

How much Freon did he install?

Roy
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Friday, September 14th, 2018 AT 5:02 AM

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