RL V6-3474cc 3.5L (1998)
Auxiliary Air Valve (Idle Speed): Testing and Inspection
Inspection
NOTE: The fast idle thermo valve is factory adjusted; it should not be disassembled.
1. Remove the cover of the fast idle thermo 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.
If there is no air flow, replace the fast idle thermo valve and retest.
4. Start the engine. Hold the engine at 3,000 rpm with no load (in Park or neutral) until the radiator fan comes on, then let it idle.
5. Check that the valve is completely closed. If not, air suction can be felt in the valve seat area.
If any suction is felt, the valve is leaking. Check engine coolant level and for air in the engine cooling system .
If the cooling system is OK, replace the fast idle thermo valve and recheck.
NOTE: If the cover of fast idle thermo valve was removed, do the PCM reset procedure.
