"195-200", and mine was just at 205 (showing 210) two days ago at 97 ambient. Not bad but that was with no grades, no toad and ten degrees below this past August & our trip to Michigan. Oh well.
Yep, it had 180 'stats and that what we put back in. You're right, 180 is too cool but it felt 'safe' and I could watch the needle plummet when the fan came on. Now it runs hotter and no sign of the fan coming on.
Today I'll use cardboard and block off part of the radiator to quickly get around 200 degrees, then I'll shoot the thermostat housing again and compare the gauge with the gun temps.
Also, I'll ask at our local Detroit Diesel shop what the shutdown temp is in the DDEC. If it's below 230, then either my DDEC was getting low readings or the engine never actually got that hot.
DDEC question: is electricity in abundance coming from the DDEC to slow the fan via the solenoid or does it go somewhere else first for a boost in amperage?
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Barry & Linda Rooker
2001 triple slide, DD60, Allison
Buick Enclave
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