My 6.9 runs warm as I am sure many of yours do as well. I was planning to change the thermostat to a 71C (159F) unit to try to keep the temps down when it's hot outside.

Has anyone else tried this using either he Behr or the Wahler brand thermostats?

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1974 240D 3.0L 4(M) - 250K -OM617.910 + 300D FW + Rajay turbo power!
1977 6.9 3(A) - 84k

It's best to check with the experts:

http://www.m-100.cc/forum/default.asp

it could also be a clogged radiator either inside or out. I would suggest a new thermostat, clean the radiator from behind with a hose to clean it, and make sure the coolant it fresh.

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Regards

Warren

Currently 1965 220Sb, 2002 FORD Crown Vic Police Interceptor

Had 1965 220SEb, 1967 230S, 280SE 4.5, 300SE (W126), 420SEL

ENTER > = (HP RPN)

Not part of the in-crowd since 1952.

I think that's what I have, I don't see an issue with it. I think my car may need a rebuild radiator at some time though because it still creeps up in traffic. The auxiliary fan keeps it under control.

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With best regards

Al