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Whats wrong when your jeep grand Cherokee idles and the temp skyrockets to 260 degrees but is fine when its moving?
Wiki User
∙ 15y ago
Most likely cause is a faulty coolant temp gauge located on top of the front of the water pump, toward the front of the engine, or the water pump is bad. The fan is attached to the water pump and the drive belt rides on the water pump pulley. The reason the engine returns to normal idle when moving is that air is circulating the engine, and the coolant, and the sensor detects that the engine operating range has been reached. to fix, drain the coolant, remove the temp sensor, replace, and refill the radiator. If thsi does not solve the problem, its the water pump.
Tim
Wiki User
∙ 15y ago
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