RL V6-3474cc 3.5L (1998)
Idle Speed/Throttle Actuator - Electronic: Description and Operation
Idle Air Control Thermal Valve
Idle Air Control Thermal Valve
Description
To prevent erratic running when the engine is warming up, it is necessary to raise the idle speed. The idle air control thermal valve is controlled by a
thermowax plunger. When the engine is cold, the engine coolant surrounding the thermowax contracts the plunger, allowing additional air to be bypassed
into the intake manifold so that the engine idles faster. When the engine reaches operating temperature, the valve closes, reducing the amount of air
bypassing into the intake manifold.
Inspection
NOTE: The idle air control thermal valve is factory adjusted; it should not be disassembled.
1. Remove the cover of the idle air control thermal valve.
2. Start the engine.
3. Put your finger on the valve seat area, and make sure that there is air flow with the engine cold (engine coolant temperature below 86 °F, 30 °C)
and idling.
