Car overheats all the time. Why?
These cars have great cooling systems. But when a problem turns up, it can cause big headaches. 1) Replace the radiator cap (actually the coolant recovery reservior cap). 2) Check hoses and clamps for leaks. 3) Flush the radiator and cooling system. I do this by disconnecting the restrictor valve by the PS reservior. While you are at it, replace this valve. The plastic commonly falls apart internally. DO NOT BYPASS it with a straight pipe…instead, order a direct replacement from GM… They are cheap. If your car still overheats, 4) replace the thermostat with a 180 degree stock unit or try a 160 degree performance unit. These can be found easily. Most already come with a gasket, so no need to buy one seperately. Use a 1/4″ drive socket to tighten the housing bolts. Do not overtighten (there is a typo in the factory service manual for the torque spec on these bolts). 5) Replace the water pump. A rebuilt unit is around $40 from AutoSupermarket. 6) Check the performance of your electric
