Thermostatically Controlled Air Cleaner

SYSTEM OPERATIONAL CHECK

1. Start engine and warm up to operating temperature, then shut engine off.
2. Remove air cleaner cover.
3. Cool thermo valve below 38°C (100°F) by blowing compressed air onto it or by placing a piece of ice on top of valve.
4. Start engine and observe damper valve. Damper valve should be closed to outside air and open to heated air from hot air tube.
5. As intake air heats the thermo valve, the damper door should begin to open to outside air. When intake temperature heats valve over approx. 50°C (120°F), the damper valve should be fully open to outside air, and the thermo valve should open the air bleed to ambient air.


THERMO VALVE/AIR BLEED VALVE

1. Check that air flows through valve below approx 38°C (100°F), and that no ambient air is allowed into valve.
2. Check that air flows through valve and a small amount of ambient air is allowed into valve when valve is between approx. 50°C-60°C (120°F-140°F).
3. Check that valve fully opens air bleed when temperature of valve is over approx. 60°C (140°F).
4. Replace valve if defective.



VACUUM MOTOR/DAMPER VALVE

1. Disconnect vacuum hose to vacuum motor.
2. Connect vacuum pump and apply approx. 200mmHg (8"Hg) vacuum. Damper valve should close air cleaner to outside air, and should hold vacuum.
3. Disconnect vacuum pump. Damper valve should open air cleaner to outside air.
4. Replace if defective.