A/C blowing hot air

KELLY030

MEMBER
2005 NISSAN ALTIMA
160,000 MILES

My freon is full but when I turn my a/c on it blows warm air. Then it may kick on to cold after a while, then kick back to warm. Someone told me it sounds like it is short cycling. What do I need to check and replace? I have already replace the low pressure valve.

6 Replies

KHLOW2008

MECHANIC
41,814 POSTS

This sounds like a classic compressor clutch problem. Here are a guide to help you confirm the problem.

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

and if so

https://www.2carpros.com/articles/replace-air-conditioner-compressor

Please let us know what happens.

Cheers,

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Tuesday, May 25th, 2021 AT 11:28 AM

KELLY030

MEMBER
2 POSTS

The a/c compressor is disengaging, and it is not switching to heat. Thanks for the guide I tested for power at the compressor and there was. Then replaced the compressor and it is all fixed, I love this site!

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Tuesday, May 25th, 2021 AT 11:28 AM

BOULDER40MMA

MEMBER
2 POSTS

I am having this issue with my wife’s 2006 Nissan Altima. 2.5liter. The compressor clutch is engaging and it shows it has Freon. The valve shows red and the can says that means there’s an issue. It won’t take any Freon and it’s not freezing up. It worked for her in the morning then she left after a couple of hours and it only blew hot air. Is there any fuses I should check?

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Tuesday, May 25th, 2021 AT 11:28 AM

KEN L

MASTER CERTIFIED MECHANIC
47,513 POSTS

The clutch is turning on can you tell? Here is a guide to help you see if the clutch is turning on:

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

Please run down this guide and report back.

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Tuesday, May 25th, 2021 AT 11:28 AM

BOULDER40MMA