Overheating -

[Keith Seymore]

Just got back from my first race trip, this one in Atlanta.

I drove through the night Thursday night, hitting the city around 8 or 9 am. My truck was running hot, like 250 deg, pulling the grades into and out of Atlanta. We limped it to the track, in Commerce, about 10 am. Ambient temp was about 77 deg, so not terribly hot.

I'm looking for suggestions on a potential root cause and solutions.

We were able to make it home by turning off the AC and turning on the heat full blast. Actually - we could pretty much control the engine temp by playing with the heater, and kept it solidly at about 210 deg once we made that discovery. As Sunday evening wore on the ambient temps dropped and the ground leveled out so by the time we hit Cincinatah it was about 52 deg and we were home free.

By way of reminder, it's an '04 2500HD with the 6.6 Duramax (LB7) and 3.73 gears. Trailer weighs about 7500 lbs with the car in it.

Thanks,

K