I am purchasing a new A/C compressor but not sure if I need to add Freon oil to start before I change it. My A/C compressor is fried from not having Freon and was dried out
No, don't add any Freon before changing out compressor.
Unfortunately, due to the multiple places where leaks can occur, and the concern of releasing Freon into the atmosphere when opening up an air conditioning system, this work SHOULD be done by qualified personnel with appropriate tools. Auto air conditioning is NOT in the realm of "Do It Yourself" any longer.
It would be best if, after installing the new compressor, you took the vehicle to an auto center that services auto air conditioners. They can draw a vacuum into the system before filling the system with Freon. This will give you the best fill with Freon and will reduce and/or eliminate condensation in the system.
Also, if you're opening the system to air anyway, to change the compressor, you should consider changing the drier in the air conditioner line as well.
I will change the dryer as well but will the compressor or dryer get damaged if I crank my truck and drive it to the repair shop?
I can't say absolutely. In my vehicle, if there wasn't any freaon in the system (no pressure) the clutch would not engage the pulley, so the system didn't turn on. I think most, if not all, systems work this way. I'd call the repair shop and ask them to be sure.
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