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What causes the temperature to go up when idling and down when moving on a 1994 Ford Explorer 4.0?
Deezcrazynuts
As long as the engine temperature doesn't move into the extremely hot range, then this is just normal operation for the engine's cooling system. When an engine is running at idle speed with the vehicle stopped, there is no air flow coming through the grill to assist in cooling the radiator. Only the engine's fan system is doing any of the cooling at idle speed. For this reason, the engine temperature will increase somewhat at idle in a non-moving vehicle. Once you start moving, even though the engine RPMs increase causing more heat, the air flow forced through the vehicle's front grill and through the radiator cooling fins compensates for the added heat and decreases the engine temperature. Note however, if the temperature is moving into the extreme hot area on the dash gage when the vehicle is idling and not moving, there may be issues with the engine's cooling system.
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