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In reality, most AC work is pretty simple. The compressor has to compress the gas, the condensers remove the heat and make it liquid, the evaporator lets the gas expand and produce cold, and cool the interior of the car. Back to the compressor, and start again.
Of course there are some other parts involved. I would guess the biggest problem for most AC systems is a slow leak. As cars and the hoses age, leaks can happen, but don't just add Freon, you will need gauges to have a real chance of making it work. There are pressure switches, and connectors that have to be working properly.
One thing that is easy for my cars, the AC system is easily visible, and accessible. I can change the main blower on my El Camino in 15 minutes, and a new one is dirt cheap, the $25 range.
I was lucky and had my father in law to teach me the simple basics. I have his tools and tool box of AC stuff. I still use his recovery system when I work on my systems and I lose almost no refrigerant when working on my cars. And I only work on my cars.
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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
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