Air conditioner

Tiny
BRICKHOUSE 1955
  • MEMBER
  • 2001 NISSAN PATHFINDER
  • 3.5L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 170,000 MILES
When I come to a stop light the cold air stars turning warm and when I start going again to turns back to cold air
Saturday, June 21st, 2014 AT 8:09 PM

1 Reply

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
This is due to the pressure in the system being low. We need to start with checking the pressure on the high and low side. Then pull it into a vacuum to make sure there are no leaks.

Here is a guide that will help with this:

https://www.2carpros.com/articles/re-charge-an-air-conditioner-system

Once we know what the pressure is with the engine off and then with it on and A/C running we will have a better idea what the issue is.

However, I suspect the system will just need to be charged assuming it will hold a vacuum for about an hour. If it doesn't then there is a leak.

Here is a guide that will help with finding a leak:

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

No leaks, then we need to charge the system if it is low. Here is how you do that.

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

Lastly below you will find a chart that shows proper pressures based on temp. Also if the pressures are not just showing a low charge, this will show possible causes.

Please let us know what questions you have. Thanks
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Friday, August 27th, 2021 AT 7:59 PM

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