2006-ish Chevy Express, CCOT front / TXV rear. Marginal AC at idle. Pretty good at speed. Suspect years of minor shaft leakage has charge a little low. What would be the procedure for measuring charge level? Have a set of gauges and also a thermocouple. On a TXV car I would check for subcooling at t...

I never realized how much a malfunctioning thermostat could lead to warm air. Even if the 'stat was running the core too cold. Now I see that as soon as I turned the blower from 4 down to 3, the core would start icing and performance suffer quickly over a matter of minutes rather than half an hour o...

Well, after some days of use (never gotten that hot here yet) I can say that this thermostat has made a world of difference. Before, it would work OK on the initial pull-down of the cab temperature but never get real cold. I see now that the problem was that on anything other than full blast, icing ...

In the interest of furthering the discussion I will post an answer to my own question. After I posted this I remembered the small AC shop guy that works out of his garage so I went over there. He dusted off a couple of old thermostats, some with levers and one with a D-shaft for a knob with the righ...

Folks, I have an old Ford truck with dealer AC installed many years after new. It is nothing like the factory setup. It has an H-block TXV and a thermo switch buried in the evaporator. Well today the thermo swtich gave up completely. It would not open no matter what the adjustment and the whole thin...