You said you checked your fans and thermostat. I understand seeing if the fans are running is a great check. But how did you check your thermostat? Replacement is a great check, and a rather cheap preventative maintenance. If you have not done so, I would replace the thermostat. Theres not much to go wrong with a water pump. Usually they are replaced when they leak. I could see if your system had never been taken care of, maybe the impeller is all rusted up and not being efficent. You can replace your pump if you desire, but you will probably find the one you take off is pretty close to the one you put on. Again it is not a hard thing to replace, and relativley cheap.
If your thermostat is getting old, and starting to stick little, I could see this being a little problem. Also if the thermostat sticks open, the fluid may pass thru the radiator too fast to cool it enuff for when your car is under a load.
Check the fins on your radiator/condensor and see if you are getting good air flow across the radiator coils. They make flush kits to back flush your radiator and try and clean it out in reverse. It might not be a bad idea to replace the thermostat and flush your radiator and see if that will get your system back to handling the load under extreme conditions.
Friday, July 28th, 2006 AT 4:22 PM