Front AC is blowing warm air

Tiny
MCAMERON80
  • MEMBER
  • 2001 CHEVROLET SUBURBAN
  • 5.3L
  • V8
  • 2WD
  • AUTOMATIC
  • 215,265 MILES
My front air is blowing warm all of a sudden, but my mid and rear is blowing cold. What could be causing this.
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Saturday, August 11th, 2018 AT 5:19 AM

4 Replies

Tiny
MATTHEW CAMERON
  • MEMBER
  • 2001 CHEVROLET SUBURBAN
  • 5.3L
  • V8
  • 2WD
  • AUTOMATIC
  • 215,246 MILES
My front A/C is blowing warm all of a sudden but the mid and rear is blowing cold still. What could be causing this?
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Sunday, August 12th, 2018 AT 12:08 PM (Merged)
Tiny
ASEMASTER6371
  • EXPERT
Good afternoon.

Do you have a set of gauges? I would like to see what the high and low side pressures are at this point.

It is also possible that the blend door in the dash is not working correctly. Can you hear the mode door move back and forth when you command cold and hot?

Roy

https://www.2carpros.com/articles/replace-blend-door-motor
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Monday, August 13th, 2018 AT 2:02 PM
Tiny
MCAMERON80
  • MEMBER
I do not have gauges but my whole system started blowing warm so I added more Freon and it started blowing cold again in the mid and rear. I checked the mode door underneath the left of the glove compartment that switches it from hot to cold and it was working. Then I checked the one under the right of the steering wheel that switches it from upper lower and defrost and it worked. There is one more that requires me to pull the dash but I am not sure what it controls. The clutch was engaged and running the whole time I had it blowing on high and it stayed cold in the mid and back the whole time it was blowing a little cooler in the front but nothing to be excited about.
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Thursday, August 16th, 2018 AT 6:33 PM
Tiny
ASEMASTER6371
  • EXPERT
This is why you need a set of gauges. I need the readings on the high and low side to see if the system is working correctly.

Just adding Freon and it got colder tells me it may be Freon related. I would not do anything until these pressures are checked.

Roy
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Friday, August 17th, 2018 AT 6:24 AM

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