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I am a certified technician (ASE Certified) so I know of what I speak.
First, I don't believe any amateur should mess with safety related equipment, which includes brakes, SRS(air bag and SIPS), as well as the AC system.
The AC system operates at hundreds of pounds pressure, and if an amateur connects a "WalMart Special" kit to the wrong port, the equipment could exploder and badly injure or kill the shade tree mechanic. Most amateurs don't know the difference between a can of R134 and a can of Pringles chips, and trying to use the wrong refrigerant or lubricant can cause thousands of dollars damage to a system.
The poster to who I reply also neglected a basic safety procedure that is absolutely essential, and that is to wear eye protection while working around any dangerous mechanism. He also neglected to advise that the electric cooling fan could come on at any time while the engine is running, and is a hazard to careless fingers.
Most shops only charge $100 or less to do a check of the AC system, and that is money well spent by the home tinkerer. I spent years learning my trade, as did my fellow technicians, and it is false economy when working on an expensive piece of especially cdomplicated machinery to skimp on a hundred dollars.
Let a Pro do it right for you.
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