Posted by pete 23 on August 19, 2015 at 10:48:57 from (50.33.22.121):
In Reply to: Auto A/C experts posted by Mike M on August 19, 2015 at 05:14:18:
The way things are hid on a lot of vehicles, the simples tests become difficult. On an old tractor, you can very easily tell if you have power to the compressor for instance. That tells you a whole lot, but on modern cars, you cannot get at the connectors to even test this. Then you throw in the way they control the electronics, like sending power to most every thing but the control is done through the grounding end instead of the power in side it leaves a lot of us out of the mix. Also, testing pressures. A 30 pound canister of refrigerant, that has been standing undisturbed for a time, will show the same pressure with only a couple of pounds of refrigerant in it as it will when full, within a very small range. It is not like pumping up a tire. Also , a system that has a partial charge, enough to make it function , will show almost exact same pressure as fully charged. There again, not like checking air pressure in a tire.
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