Auxiliary Air Valve (Idle Speed): Testing and Inspection

INSPECTION
1. Remove the cover of the Fast Idle Thermo Valve.
2. Start the engine.

Checking Fast Idle Thermo Valve:

3. With cold engine (engine coolant temperature below 30°C [86°F] ). Use your finger and cover the valve seat area making sure there is air flow or suction with the engine cold. If there is no air flow or suction replace the Fast Idle Thermo Valve and retest.
4. Warm the engine up to normal operating temperature (the cooling fan comes on).
5. Again using your finger at the valve seat area check that the Fast Idle Thermo Valve is completely closed. If any air flow or suction can be felt the valve is leaking. Replace the Fast Idle Thermo Valve and retest.

NOTE: Do not attempt to disassemble the Fast Idle Thermo Valve, it is factory adjusted.