AC system blowing warm air

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

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

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

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

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

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-