A/C blowing hot air

Tiny
KELLY030
  • 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.

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Tuesday, April 30th, 2013 AT 12:44 PM

8 Replies

Tiny
KHLOW2008
  • EXPERT
  • 41,933 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, April 30th, 2013 AT 5:02 PM
Tiny
KELLY030
  • MEMBER

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, April 30th, 2013 AT 6:06 PM
Tiny
BETHANYJOY
  • NISSAN ALTIMA

Hi,
I have a 1999 Nisssa Altima with about 115,000 miles on it. When I turn on the AC nothing but hot air blows out of the vents. Do I just need to have this serviced or is there something more involved? Thanks!

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Friday, July 7th, 2017 AT 6:23 PM (Merged)
Tiny
RASMATAZ
  • MEMBER

Its probably low on freon

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Friday, July 7th, 2017 AT 6:23 PM (Merged)
Tiny
GATORBAIT4187
  • 2013 NISSAN ALTIMA
  • 2.5L
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 50,000 MILES

Recently the a/c on my Altima started blowing warmer and warmer. Having worked on vehicles over the years, I did the typical checks. A/C clutch was not engaging, freon was charged. So, I replaced my compressor as well as my expansion valve. After doing this, I vacuumed the system then put freon in. The clutch is engaging on the new compressor. But I still get only hot air. I checked the fuses, couldn't find a problem there. The only thing I haven't checked is my a/c relay and Nissan is very vague on their diagrams of where the relay may be. I'm frustrated with this and open to suggestions.

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Friday, July 7th, 2017 AT 6:23 PM (Merged)
Tiny
SATURNTECH9
  • EXPERT
  • 31,084 POSTS

If the AC clutch is engaging I would say the relay is working. What are the high side and low side AC pressures with the AC on?Also have you checked your blend door?

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Friday, July 7th, 2017 AT 6:23 PM (Merged)
Tiny
SHADETREE45
  • 1999 NISSAN ALTIMA

Air Conditioning problem
1999 Nissan Altima 4 cyl Front Wheel Drive Automatic

on real hot davs a c will stop cooling. Blows hot new compressor, dryer, and ambient switch

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Friday, July 7th, 2017 AT 6:23 PM (Merged)
Tiny
RASMATAZ
  • MEMBER

The AC system could be freezing up due to air and moisture forming ice blocking off the orifice tube, try getting it vacuumed

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Friday, July 7th, 2017 AT 6:23 PM (Merged)

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