LN TStat Failure

[ike84]

Originally Posted by WillH

My guess is air in the system caused the puke after the engine was shut down at the end of a hot day. I didn’t let the fans cycle off before shutting it down.

My pump looked ok but removing the belt and putting some force on it I could hear and feel play. Plastic impeller looked new after almost 20 years. Bearing not so much. A few drops of coolant and dried residue at the bottom showed it had leaked. I didn’t check the original OEM thermostat as I was changing it anyway. Physically it looked fine. As far as I was concerned I had found my culprit so didn’t heat water to check it’s functioning.

Do you think the air came from the bad pump? I've not heard of such a thing.

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[WillH]

Originally Posted by ike84

Do you think the air came from the bad pump? I've not heard of such a thing.

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That or? Bad cap? The cap was new a few years prior and ending in 4. I changed it out anyway.

[Homeoboxter]

You are saying the car had been jacked up since Thanksgiving, right? Did you jack up only the rear end? Perhaps you did have an air pocket in front which moved up to the rear end while being jacked up? Just a thought...

[ike84]

Originally Posted by Homeoboxter

You are saying the car had been jacked up since Thanksgiving, right? Did you jack up only the rear end? Perhaps you did have an air pocket in front which moved up to the rear end while being jacked up? Just a thought...

No, it was jacked on all 4 corners and level all around. It certainly has been at an angle while going onto and off the stands, but no more than driving up a hill or loading on a trailer.

The more I think about this the more I'm convinced it's a failed TStat. There are two (broadly speaking) types of these, traditional ones and "fail safe" ones. What's the difference? When fail safe stats fail, they snap open and stay there. Why? Because when the traditional ones fail, this is what happens and the car overheats. Unfortunately, I don't not think that any boxster TStat is a "fail safe" design.

If I had just changed the fluid that would be a different story, but piper's point is hard to ignore.

I will say though that I asked my friend who is a professional mechanic and he has on multiple occasions seen tstats fail after prolonged storage - essentially they just get stuck. I have mixed coolants in the system (all OAT of course) but it will be interesting to see what everything looks like when it all gets drained and the TStat is out.

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