A/C blowing hot air

2003 CHEVROLET AVALANCHE
286,400 MILES • 5.3L • V8 • 4WD • AUTOMATIC
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BIGALLOYMAN
  • MEMBER
  • 27 POSTS
I get hot air out of all my vents when A/C is on. I tried to charge the system the gauge read full. My clutch fan is turning. What else can it be? Thank you
Jun 26, 2018 at 10:21 AM
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ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 POSTS
Good morning.

Can you see if the clutch is engaged when you have the AC on?

What pressure do you see on your gauge?

Roy

https://www.2carpros.com/articles/car-air-conditioner-not-working-or-is-weak

https://www.2carpros.com/articles/re-charge-an-air-conditioner-system
Jun 26, 2018 at 9:58 PM
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BIGALLOYMAN
  • MEMBER
  • 27 POSTS
I stated my clutch is turning and the gauge is on the can of refrigerant all it is ,is green blue yellow or red it was in blue. If I had a gauging system I probably would know what was wrong with it.
Jun 27, 2018 at 8:24 AM
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ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 POSTS
Okay, you can rent a set of gauges at a parts store or buy a cheap set at Harbor Freight for about $30.00. Then you can monitor high and low side pressures to see if the system is working correctly.

Is the line returning from the evaporator cold to the touch?

When you command the heat and cool, can you hear the blend door actuator moving back and forth? If it is stuck in the heat position, it will not allow cold air from the vents.

https://www.2carpros.com/articles/replace-blend-door-motor
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Jun 27, 2018 at 8:41 AM
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