AC blows out air but it is not cold

DALLAS HENRY

MEMBER
1999 ISUZU TROOPER
3.5L
6 CYL
4WD
AUTOMATIC
152,000 MILES

When I turn the AC on it blows out air but it is not cold. My uncle said maybe the compressor, but how will I know? Also, when I put the SUV in park the rpm's go up to 2,100.

Wednesday, September 26th, 2018 AT 8:53 AM

5 Replies

DANNY L

MECHANIC
5,648 POSTS

Hello, I am Danny.

Have you noticed if the compressor is cycling? When was the last time the A/C system was serviced (refrigerant added)? The system has a cut-off switch that shuts the compressor off if a low level of refrigerant is detected. That is to prevent damage until proper level is corrected. I have attached a few tutorials for you to view.Hope this helps and thanks for using 2CarPros.
Danny-

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

https://www.2carpros.com/articles/air-conditioner-leak-detection

https://www.2carpros.com/articles/air-conditioner-how-to-add-freon

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Wednesday, September 26th, 2018 AT 12:34 PM

DUWHOP31

MEMBER
151 POSTS

Okay, so when I turn on the AC it does not make a squealing noise. Do I put the AC charge on the low port with the car on and AC running or with the car off?

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Thursday, September 27th, 2018 AT 8:37 AM

DANNY L

MECHANIC
5,648 POSTS

Hello again.

You add to the low side (only fits on that port) with car running and controls on Max A/C. It may take awhile it enters slowly. Hope this helps and thanks again for using 2Carpros.
Danny-

https://www.2carpros.com/articles/air-conditioner-how-to-add-freon

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Thursday, September 27th, 2018 AT 5:05 PM

DUWHOP31

MEMBER
151 POSTS

The gauge reads zero when it is off or on with AC on max.

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Friday, September 28th, 2018 AT 8:16 AM

DANNY L

MECHANIC
5,648 POSTS

Hello again.

It usually takes a while if using a recharge can for enough to enter to get the compressor to cycle. Has the A/C been working recently and then quit? It is also possible you have a major leak in the system. I have attached a tutorial show leak detection. Hope this helps.
Danny-

https://www.2carpros.com/articles/air-conditioner-leak-detection