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I have a 1990 model pick up with a c problems. I have replaced the compressor, orifice tube and accumulator twice. I added pag oil to the compressor each time and I let it sit for over an hour and spent the compressor while adding the oil. I took it to a professional shop each time to have the...

Hello everyone. I'm a newbie to this site. I have a 96 tahoe with the vortec 350. The engine is making a high pitched squeeling noise similar to that of a water pump about to go out. Problem is its been making this noise for over 10k miles and if it was the water pump I figured it would have...