My 1999 S-10 has 2 weird problems....
1: I take my work breaks in my truck. I will run the AC on hot and humid days. The air runs fine, then after a while, the compressor cuts off. It will cycle for a few minutes and then stay on. This does follow a pattern based on the vehicle's coolant temp guage. I *assume* this a way for the truck to "save itself" from an overheat condition befor the thermostat opens. Is this a correct assumption? The temp guage never goes higher than the halfway mark, and then drops a bit when I assume the 'stat opens. Just wanting verification of this odd behavior.... the vehicle is always at idle and never moves. AC functions perfectly when driving.2: Any time the AC compressor/system cuts off, or is turned off, whether by the switch or by turning off the truck, there is a high-pitched squeal for a few seconds. This only happens when one of the AC settings is switched off. I do not believe this is normal, and indicates a vacuum leak. In the winter when using the heat, and following a similar situation, the noise is not heard. IF this is a sign of a problem, where can I look to correct it.
My vehicle is a 4 cyl 1999 S-10 w/ 4 speed trans.
Thanks guys!