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AC system blowing warm air

Tiny
KELLY HELGESTAD
  • MEMBER
  • 2000 CHEVROLET MONTE CARLO
  • 3.4L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 180,000 MILES
My AC has correct refrigerant level, clutch engages, blower blows, but still no cold air. Just blows warm air. What are possible failure points I can check?
Monday, September 24th, 2018 AT 8:48 PM

7 Replies

Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello, I am Danny.

You might want to have the Blend Door Actuators checked for proper function.There two mounted on both the left and right side of the lower heater/-A/C unit. I have attached a tutorial showing what is involved. Hope this helps and feel free to ask any questions.Thanks for using 2CarPros.
Danny-

https://www.2carpros.com/articles/replace-blend-door-motor
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Monday, September 24th, 2018 AT 11:53 PM
Tiny
KELLY HELGESTAD
  • MEMBER
  • 4 POSTS
Both blend doors are working correctly. I did notice that the radiator cooling fan did not engage when AC was turned on but when I manually turned them on it made no difference with temperature. Possible low pressure switch?
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Saturday, September 29th, 2018 AT 9:53 AM
Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello again.

Yes, it would be a good idea to test the switch. Let me know what happens. Thanks again for using 2CarPros
Danny-
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Saturday, September 29th, 2018 AT 6:39 PM
Tiny
KELLY HELGESTAD
  • MEMBER
  • 4 POSTS
So I tried a new account pressure switch hoping that would solve the problem but it did not work. Fuses good, relays are new, and I am totally out of ideas. Thoughts?
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Friday, October 12th, 2018 AT 8:21 PM
Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello again.

Do you have access to a manifold gauge set? If so, what are the readings when the compressor is running/cycling? Hope to hear back soon and thanks again for using 2CarPros.
Danny-
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Monday, October 15th, 2018 AT 3:48 AM
Tiny
KELLY HELGESTAD
  • MEMBER
  • 4 POSTS
Low side 42psi high side is 167psi.
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Saturday, October 20th, 2018 AT 7:46 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
High side sounds low, can you confirm the large refrigerant tube heading out of the firewall is cold with the system on? Turn the system on full cold and wait two minutes then check the line. You might have a compressor that is going out.

This guide might help:

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

Please run down this guide and report back.

Cheers, Ken
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Tuesday, October 23rd, 2018 AT 11:56 AM

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