A/C blows hot in extreme outside temperatures?

HUNTR02

MEMBER
2014 GMC ACADIA
6 CYL
4WD
AUTOMATIC
106,000 MILES

The A/C blows cold when outside temperatures are below 90 degrees. About 90 it blows hot air. The cabin filter was just changed, and the compressor was replaced a year ago. It has about 106,000 miles. Sometimes when I first start it and drive, if I gun the motor (speed up really quick) the air will start getting really cold on high speed.

1 Reply

KEN L

MASTER CERTIFIED MECHANIC
42,967 POSTS

It sounds like the system is low on refrigerant. Here is a video to show you how to change it and I have included the location of the A/C system charge port to help you get the job done:

https://youtu.be/uZrQCGwXfek

This guide can help you see how the A/C works:

https://www.2carpros.com/articles/how-a-car-air-conditioner-works

You can see if the system is low on refrigerant, it will act the way you have described.
Here is a guide that can help as well:

https://www.2carpros.com/articles/comprehensive-guide-troubleshooting-intermittent-automotive-air-conditioner-problems

If the charge is okay, you have an A/C compressor that is going out. Here is a generic guide to help you step by step with instructions in the diagrams below to show you how on your car:

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

You will need to vacuum down and recharge the system.

here is a video to help with that as well:

https://youtu.be/4EqdrBVb0sY

Check out the images (below). Please let us know how it goes.

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