My 02 Tundra has 278,000 miles on it. I have take very good care of the old girl and she has taken care of me. I was pulling my 24' camper a while back and she started running very warm. After just driving around town, it was fine until I ran into stop and go traffic. I have never had this issue in the past. It was time for a timing belt change anyway, so I had a good mechanic shop install the new timing belt, water pump, thermostat, and radiator. I usually work on my vehicles, but do to not having the time, I opted for them to do the work and I knew them prior. When I got the truck back a few days later it started heating up in stop and go traffic. I installed a OEM clutch fan. The truck did better and even sounded better. I pulled a tractor the other day and it started to heat up again. I pull with the overdrive button pushed I and never had an issue until now. This is driving me crazy. has anyone had this issue?