Cooling fan does not come on

Welcome to 2CarPros.

This could be the result of a few things. First, are you certain that the AC system is fully charged? If it fails to actuate the compressor, the fan won't turn on. Here are a couple links. The first one discusses common issues with AC not working. The second explains how to charge the system.

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

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

Let me know if that helps or if you have other questions.

Joe

With engine running, the low side is high and high side is low, when A/C is on, the compressor clicks on and low pressure goes down to 100 , but the fan does not come on. therefore the A/C compressor disengages and vehicle gets hot.

Welcome back:

If the low side goes down to 100, that is extremely high. The idea that the low goes high and the high goes low, I suspect the compressor is bad. If the low side goes down to 100 where does it start?

Joe

the A/C low side is over 100, compressor clicks on with no cooling fan, and low side pressure goes down to 100 and compressor shuts off.

Welcome back:

I suspect either the system is either over charged (high pressure switch turning it off) or the compressor is bad. Even under extreme conditions, for example at 110°F low pressure should be under 60. Could you have over charged it?

Let me know.

Joe