Air condition Problems

1991 CHEVROLET 1500
100,500 MILES • 5.7L • V8 • 2WD • AUTOMATIC
Avatar
DANIEL G.DURAN
  • MEMBER
  • 1 POST
ON my 1991 C1500 my AC cools good on the low and medium blower settings.

The problem stars when I turn the blower on to the high position, the compressor turns off and I start getting hot air.

Is there a solution to this problem/
May 24, 2022 at 5:36 AM
Advertisement
Avatar
KASEKENNY
  • ✓Experienced Mechanic
  • 18,907 POSTS
There are a couple things that come to mind when doing this. However, the thing to start with is to check the pressure in the system.

Even though you are getting cool air on the lower settings there is a chance that we have an issue with the pressure that is causing the compressor to cut off when you are setting to Max AC.

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

Assuming the pressure is ok, we could also have an issue with the pressure cycling switch, so we are going to have to jump the switch and see if the compressor comes back on.

However, let's start with the pressure and find out if we have an issue here because if we do then we need to go a different direction.

I am attaching a chart below that will help with determining if this is an issue.
Image (Click to enlarge)
Professional Diagram for 2CarPros Members
Click here to log in and view diagram.
May 25, 2022 at 3:52 AM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.