Temperature Sensor Valve
NOTE:
Engine must be cold before performing this test. Check hoses, air control diaphragm and valve first.
- Start engine, allow to idle and use mirror to observe position of air control valve. Valve should be open (hot air inlet uncovered, fresh air inlet blocked).
- Continue to observe valve as engine warms up. Air control valve should gradually move to the closed position (hot air inlet blocked). If valve does not respond as specified, replace temperature sensor valve assembly.
- Also inspect the rubber plate for stickiness and the air intake hose for damage or leaks at its connections.