Exhaust Emissions System - Thermostatic Air Cleaners: Testing
- Remove thermostat and place in a container of water. With water below 43°F (8°C), air door position should be such that only air from the heated duct will enter air cleaner.
- Heat water slowly and observe door position. It should move from hot-air-only entry position to cold-air-only entry position as water is heated and approaches 64°F (18°C).