First, the thermostat (t-stat) isn't to open until it reaches 195 degrees. Therefore, you are really not too much above that. If the t-stat sticks shut, you will boil over as you mentioned. If the heater in the car is still producing heat, there is no air in the system. Also, you mentioned that there was a leak. Can you describe the aprox area it was coming from for me. Also, if you follow the upper radiator hose to the engine, it will lead you to the t-stat housing. THe t-stat is under that. If you want to remove it and check it, here is a how to:
LEt me know where the coolant was coming from. Something tells me the water pump was leaking, getting coolant on the belt and causing the noise. Also, the t-stat may be the problem with the temp or the cooling system may need flushed too. If neither was done over the years, it is actually a good idea as a preventative maintenance service.
Let me know.
Monday, September 21st, 2009 AT 10:25 PM