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The car was changed to R-124a a few years ago by an AC shop. I, about a month ago, only let more gas escape to almost empty and refiled it.
I checked three switches including the low pressure one and I think they should be either open or closed. I tested both states on each and it does not cause the clutch to engage. I am not sure if this is a way of testing them.
If I apply a voltage directly to the clutch it will engage and the AC works, cooling the car.
I wonder if it is the thermostatic switch. How can I access it?
Thank yopu,
Tony
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