Air Cleaner - Thermostatic: Testing
- Make sure all vacuum hoses and the heat cowl to air cleaner air duct are properly attached and are in good condition. With a cold engine and ambient temperature less than 41°F (5°C) on Colt. The air control valve should be in the up or heat on position.
- With engine warmed up and running, check the air temperature entering the outer end of the snorkle. When the air entering the outer end of snorkle is 108°F (42°C) or higher on Colt. The door should be in the down (heat off) position.
- Remove the air cleaner from the engine and allow the air cleaner to cool off to 41°F (5°C) on Colt. With 15 in. Hg vacuum applied to the sensor, the valve should be in the up (heat on) position. Should the door not rise to heat on position, check the vacuum motor for proper operation.
- To test vacuum motor, apply 10 in. Hg vacuum with a vacuum pump. Valve should be in the full up position. If vacuum motor is no good, replace air cleaner assembly.