I have never replaced one, and I have put 55k on this car, so not sure when it was replaced before (if at all).
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On my own cars, I leave them alone until they act up or if it has ever been overheated from any cause. Currently 230,000 miles on the original t-stat in one of my cars.
But when it does fail, you'd better hope it sticks open and not closed.Quote:
I would change it every 100K miles as PM. It is my understanding that they don't fail often...
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You can buy thermostats from AutoZone that fail open. I'm sure others have it as well.
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I change my tstat when I change the radiator/heater hoses.....about every 30K-40K. People still change their hoses right? It's amazing that most people don't do the most basic of maintenance to their cars/trucks these days.