Thermostatically Controlled Air Cleaner

Thermostatically Controlled Air Cleaner (TCA):

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 and hot idle compensator valve below 38°C (100°F) by blowing compressed air onto them or by placing a piece of ice on top of valves.
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 and hot idle compensator valve, the damper door should begin to open to outside air. When intake temperature heats valves over approx. 50°C (120°F), the damper valve should be fully open to outside air, and the hot idle compensator valve should open to allow air into the manifold vacuum hose.


THERMO VALVE

1. Check to see that air flows through valve when valve is below 38°C (100°F), and that no ambient air is allowed into valve.
2. Check to see that the vacuum source side of valve is blocked, and ambient air is allowed into the vacuum motor side of valve when temperature of valve is over approx. 44°C (111°F).
3. Replace if defective.



HOT IDLE COMPENSATOR VALVE

1. Check to see that valve is closed below approx. 50°C (120°F).
2. Check to see that valve is open above approx. 50°C (120°F).
3. Replace 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.