4A-GE MK1 Engine High Pitched Noise [Archive] - Toyota MR2 Message Board

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Hi all. I need some suggestions on what could be making a high pitched noise in the right side of the engine bay of my 1987 MR2. First some background. My MR2 was having problems overheating after sitting idle for about 10 minutes or so after a drive. I did the basics, flush the antifreeze and bleed the system. The problem persisted, so I replaced the water pump, thermostat, and radiator cap with no results. I noticed that as the engine would start to overheat, I would hear a high pitched