I recently discovered that the water pump in my S10 was leaking from the weephole. I originally discovered the problem while investigating why my heater wasn't working. I replaced the pump with a new one, and I changed out the thermostat (making sure to orient it correctly). I completely back-flushed the cooling system (per Prestone kit/directions). On starting the truck, it runs OK for awhile, but as it heats up it becomes sluggish, and eventually conks out. The heater still shoots out cold air. Also, even though I don't see any leakage, the amount of liquid in the radiator is going down. After running the engine for awhile, it doesn't seem to be overheating, but there is a lot of gurgling coming from the heater core. Have I blown a head gasket, or something?
Feb 28, 2008 at 10:47 PM