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I can attest that a 1200 cc 1965 Bug ran fine with an AC system, it was a dealer option that used an old style less efficient York Compressor, and ran all the time in the Arizona desert. It did not over heat the engine, although you did want to switch it off on step grades as it did drain some power, but you didn't notice it most of the time, only on step hills. it made the car icy cold.
The AC was an option on 914 cars with the type IV motor, not sure if it caused problems or not, but I doubt it. This is same style of motor as the 912E cars.
Some 356's have run old school AC systems installed, I have seen them in 356 Registry magazines. I don't recall mention of over heating issues in them, you may want to inquire on the 356 registry form if you have that style of motor in your 912.
I say go for it if you want, for me I prefer the windows down and where applicable wing windows full open approach to climate control. But you should be able to run the AC without over heating the motor, it is no big deal. It only draws a small fraction of the available horsepower.
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