vwhobo, I can't be sure about the refrigerant. I was going by the way it was cooling before it stopped. I've had vehicles in the past that ran low on refrigerant and I could tell by the way it slowly stopped cooling. My truck just clicked off. I didn't know if there was some type of relay in those systems or not. I'll check the pressure though. The gauges I have don't have the right fittings on them, are there inexpensive gauges available anywhere.