Vacuum Control Temperature Sensor
- Tape a thermometer close to the vacuum control temperature sensor located inside the air cleaner. Leave wing nuts off top of air cleaner so that top can be quickly removed to read thermometer during test.
- With engine cold, temperature below vacuum control temperature sensor specifications, check air control door in air cleaner. It should be in fully open position (open to outside air).
- Start engine. As soon as engine starts, door should move to full heated air position (closed to outside air). Watch air control door.
- When door reaches fully open position, quickly remove air cleaner top and read thermometer. Compare thermometer reading with specifications.
- If reading is not to specifications, perform vacuum motor test. If vacuum motor is okay replace sensor.
VACUUM CONTROL TEMPERATURE SENSOR SPECIFICATIONS
| Application | Heated Air Temp.: °F (°C) | Fresh Air Temp.: °F (°C) | |
|---|---|---|---|
| Sensor Color Code | |||
| Brown | 75 (24) | 75 (24) | |
| Black or Pink | 75 (24) | 90 (32) | |
| Blue, Yellow or Green | 75 (24) | 105 (41) | |