Join Date: Aug 2010
Location: Sassamansville, Pa
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You will need to confirm your ECT, the ford thermostat will fail in the open position. Temp should be around 190 when fully warmed up. While your at it, check your ECT/EOT delta to confirm that your oil cooler is not blocked.
Have you checked the heater core hoses after its fully warmed up (190*), the hose with the in-line valve will be the feed for the heater core, touch the hoses and compare temp differences. It's rare, but the heater core can become clogged with casting sand.
If the above mentioned is OK, I would suggest getting your coolant tested for exhaust gases. Meaning, there might be a chance it's the headgaskets.
2004 F350 CC DRW King Ranch
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