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Your punctuation makes understanding one critical sentence very difficult. PLEASE write clearly and precisely. Run-on sentences confuse everyone.
Here's the problem....
"Under any load and high temperature outside it begins overheating if I slow down and pull off and turn the heater on it cools back down quickly..."
Let's try breaking this down and see if I understand.
1) Under any load and high temperature outside it begins overheating. (end of sentence.)
Is that correct? If so, does it overheat at (a) SLOW speeds, or at (b) HIGHWAY speeds, or (c) BOTH?
If it overheats only at slow speeds, I suspect your electric radiator fans are not coming on. If it overheats at high speeds, I suspect your thermostat is sticking. If both, I also suspect the thermostat.
2) If I slow down and pull off and turn the heater on it cools back down quickly. (end of sentence)
Good move on your part to know that turning on the heater is like adding a small radiator. This doesn't change the diagnosis, but it tends to indicate that the thermostat is not sticking shut, as in that case, turning on the heater would not help much if any.
Does that help?
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