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Originally Posted by Frank S
I have a 2001 Pathfinder 4x4, and have been towing my 18ft 2500 lb boat around since I bought the truck new. All of a sudden, now I overheat when pulling the boat. It can happen within a few miles. I am not using overdrive, and the fluid level is good. When the truck gets very hot, I am cranking the heat to bring the temp down. The fan is running with the engine. Should I change the thermostat? The tranny fluid runs through a separate cooler into the radiator.
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I tow about the same weight boat with my 97 and have never had any problems with overheating. How is the coolant condition, have you changed it recently? You might try cleaning the radiator and tranny cooler with a water hose, spray from behind towards the front of the car. Thermostat would be a good bet but I would think you'd be running a little hot even not towing if it was stuck completely or partially closed. Have you noticed the temp any higher in normal driving?