Engine progressively approaching an overheat condition within a 50 mile drive

[Jeff_Smith]

Wow, I have never seen anything like this…Glad you found the issue. JS

[soothsayer1 (LLoyd (just a rithmetician))]

I’ve never seen anything like that either. The things I don’t know could fill a book!

LLo… ummm, Joe

“Abstainer” A weak person who yields to the temptation of denying himself a pleasure.
Writer Ambrose Bierce

[SV_Jagman (Francois Henley ‘54 XK120SE DHC & ‘72 XKE V12 OTS)]

Yes, never seen anything like this either. Apparently the part was supposed to be new, but i have a hard time believing that.

The repair work will be described in this next thread:

Repairing an overheat condition due to sludge/obstruction - and electrolysis in a XKE V12

I am starting a new thread after the many twists and turns of identifying the root cause of a creeping overheat condition. The car has both a sludge/obstruction issue in the cooling system and there is substantial damage in the thermostatic switch tee due to electrolysis. The journey to this point was described in this thread: https://forums.jag-lovers.com/t/engine-progressively-approaching-an-overheat-condition-within-a-50-mile-drive/410719 Last entry and identification of the issues =======…

Again, I appreciate all the help and support received. Hopefully this helps anybody to better diagnose a similar issue.

[BillJag (Bill Bilotti 1966 S1 OTS (in boxes))]

amazing. congratulations. You stayed sane longer than I would have

[SV_Jagman (Francois Henley ‘54 XK120SE DHC & ‘72 XKE V12 OTS)]

Thanks Bill. Let’s see if the repairs will go smoothly. I am hoping no engine work is needed from the stress of these heating excursions and the deposits.

As for finding it, I feel I did it right but only after replacing almost everything else…

Kinda what Winston Churchill said once about the US…: " You can always count on the Americans to do the right thing after they have tried everything else.”