Yup!!Another one of those coolant threads..
#26
Recovering Miataholic
The funny thing is that the stock temp gauge will go up and then swings back down to the middle after 20-30 seconds,and that's when I start to see the Temps go back down on the PFC.
#27
el unico
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Join Date: May 2006
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I honestly don't know.All I did was remove the tstat and the antifreeze,flushed the system and added a bottle of blue devil from autozone.I haven't put the tstat back nor used antifreeze since and the max the temp would go on PFC is 89c.I have added a small amount of "leftover" water mixed with blue devil(very small amount left)once and so far so good.To me it's no doubt that I have a bad coolant seal,but so far,knock on wood,everything seems to be fine
#28
Recovering Miataholic
If there is a bypass path, and it was clogged, and your flushing cleared it, I would expect your quick over-temperature followed by a fall to normal would have gone away.
#29
Recovering Miataholic
Have to apologize for my stupid errors in post #26 above. Of course there is a connection from the bottom of the AST to the bottom of the radiator (i.e. input to the water pump). Was writing from mistaken memory instead of well-documented coverage of cooling system. So it would be possible for either that hose or the thermostat housing-to-AST hose to be clogged and prevent the thermostat element from being heated rapidly by hot coolant from the engine. Your flushing probably cleared the hose(s) and solved the initial overheating with return to normal.
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