Truck Repair: 1997 Chevy Silverado 1500, chevy silverado, compressor clutch

Question
My air conditioning was working, I was hearing the ac making the clacking noise like if it was low on 134a. Then all the sudden the ac compressor quit coming on. When I turn the ac on, it blows out hot air. I Checked for leaks and can't find any, I did have to add some 134a. The ac compressor still did not come on. I checked the ac relay and the fuses and they are all good, and replaced just incase. I would like to know what else could be a problem.

Answer
Hi Michael,
It's possible you didn't add enough, which would indicate a leak, but it is also possible the low pressure switch on the acumulator is bad.
It can be unscrewed, and replaced without draining the system.

Also possible the compressor clutch is bad.
You can test the winding with an ohm meter, and check to see if voltage is getting to it with a test light.
The low pressure switch can prevent power from getting to it. I'd check that first.

Van