360 report on identical problem on three 360s

I am not sure why it happen to me , here's the account of events.

car 1. about 90 days ago, after being a garage queen for 6 months, i replaced timing belt, oils, coolant, etc.
and car overheats , i though i have air in the cooling system, alas no! the radiator is only warm(not hot) to touch when temp on dash reached 110 c (230 F). replaced thermostat. all good.

car 2. about 30 days ago, after being a garage queen for 3 months, i start the car, and it overheats. touch the radiator again, it is only warm when dash reached 110 c (230F) . replaced thermostat, all good

car 3. yestoday, after being a garage queen for 15 days, i start the car, drive the car, no problem, until i was backing up into a garage somebody called so i stopped there for 3 min with engine on. dash reached 120 C (250F), touched the radiator...... warm . will have to replace thermostat again.


i don't know how to examine a thermostat but i looked at those 2 i removed, i can't see anything bad.

I tested one of the thermostat in a hot pot of water and indeed it only opens a tiny bit, not enough for water to pass freely i guess. THe new thermostat opens a lot more than the bad one, as tested.

i had 3 different brands of coolants in 3 cars so it shouldn't be a coolant problem.

did I just hit the jackpot??????????? damn

 

no, all three car's thermostat failed. as 2 of them are tested by hot water outside the car

QUOTE="PFSEX, post: 146662948, member: 35793"]If I understand properly: car runs fine and at correct temperatures, but the gauge is reading high?

Maybe a temperature sending unit problem?[/QUOTE]

 

i only replace coolant on the 1st car. the 2nd and 3rd car just sit there for 1 month and 15 days, nothing was done to them so at least 2 thermostat failed , I tested the 1st car's thermostat in hot water, it failed.

this is a really freak occurrence.