Quote:
Originally Posted by NY2LA
Recently I was driving on the freeway and I noticed that my temp guage went as high as 120c but not into the red... the temp. outside was not hot maybe around 78*. I replaced the themostat and flushed the radiator and added new coolant... then took it out on the freeway again with outside temp at around 60* and the needle went from 40-89 in about 4-5 mins but never went above 90...
Someone made the remark that the radiator could be losing pressure around the tank seal. It is not losing coolant. I have not had to put coolant in the resevoir in over 2 yrs.
Is it possible for a temperature rise to be caused by a radiator that is losing pressure and how do I determine if that is my problem. Could there be anyother problem I am overlooking?
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The build up of pressure helps to keep the coolant mixture from boiling out. The cap is there to regulate pressure. It is possible that you had a stuck closed t-stat as well, and replacing it solved the problem. But at two years it is time to look at the expansion tank itself and the cap.
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RRGrassi
70's Southern Pacific #5608 Fairmont A-4 MOW car
13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete.
91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K
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