engine loads
There is a relay in a Vortec 5.7 liter engine that tells the computer the air temperature. When that relay has failed, the computer believes that the air temperature is 40 degrees below zero and compensates with extra fuel causing the engine to flood.
engine load
because when car is sitting still and at idle you do not have "air flow" coming into radiator to help cool it as you do when you are driving. So fan compensates for this higher engine - antifreeze temperature to try and cool it off it has to work harder.
This switch compensates for the rpm that are lost when you turn on the ac in your vehicle. The ac puts an extra load on the engine that this switch then compensates for and puts your rpm back to where they belong.
Do you mean the switch that automatically kicks down the idle when the engine reaches proper temperature to drive and indicates with the red light going out on the dashboard? It is in the thermostat housing I believe.
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.
I believe it wasn't until 2001 or 2002 that the engine fans on the Detroit diesels came on automatically when the temperature rose. You're probably required to flip the engine fan switch on manually.
The engine temperature cooling switch helps regulate the engine's temperature. Teemed with the radiator and incoming air, this keeps the engine at its optimal performance temperature.
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The engine coolant temperature sensor is usually on the front of the engine. The coolant temperature sensor will be in the vicinity of the thermostat housing.
Bad starter solenoid?