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Originally Posted by TheDon
dervman about your info on the uper rad line being hard. i have a question.. i have a coolant leak out of a freeze plug.. its not that bad but it is a leak.. before i put a new tstat in it didnt leak.. i was told this is proably due to the fact the old one wasnt getting the pressure up in the cooling system and the new one is.. could it be the new tstat is doing what it should be doing
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Sorry for the delay in replying I was away yesterday.
It may just be the increased cooling system pressure if the old Thermostat was stuck partially open or not sealing properly, but there is not that much difference in pressure between open and closed. The Thermostat just changes the water flow to go the Rad when the engine is up to temperature.
Did you flush the cooling system or replace the coolant? If you did you may have disturbed some grunge around the freeze plug and it is now leaking. I'm not a big fan of cooling system leak stoppers, but I have used them and they do work well for minor leaks. Barrs Leaks is one I have used with good success.
If you haven't already, do check the top rad hose the morning afer using the car as combustion pressures leaking into the cooling system could definitely cause leaks to appear.