Engine Cooling problem
2002 Nissan Pathfinder 6 cyl Four Wheel Drive Automatic 106K miles
Working on an overheating issue. When the engine is brought up to operating temperature, the heat blows cool unless you race the engine. It will then blow hot, but after about two minutes, it's blowing cool again. All the while the engine is getting hotter and hotter, to the point it will overheat if you allow it to. I already bled the cooling system, however never really got a solid stream of coolant out of the bleeder tube until it was at the overheating point. Replaced the lower T-Stat and no difference. My question is this: Will the upper T-Stat (water control valve) cause the vehicle to overheat if it is bad? Or is it strictly to control the water to the heater core? I'm not about to pull the intake and waste my time if totally unnecessary. Also, the fan clutch, radiator cap, radiator, and water pump are fine. Thanks in advance for any help you can offer and sorry for writing a book on this one.
have the same problem?
Friday, September 5th, 2008 AT 9:13 PM