Cold Weather Modulator
Using a vacuum pump with gauge, apply 16 in. Hg of vacuum to motor side of modulator. Determine if modulator holds or leaks within the correct temperature range. See COLD WEATHER MODULATOR SPECIFICATIONS.
COLD WEATHER MODULATOR SPECIFICATIONS
| Modulator Color | Holds Vacuum @ °F (°C) | Leaks Vacuum @ °F (°C) |
|---|---|---|
| Black/Normally Open | 20 (-6.7°C) | 35 (2) |
| Blue/Normally Open | 40 (4) | 55 (13) |
| Green/Normally Open | 50 (10) | 76 (24) |
| Yellow/Normally Closed | 65 (19) | 50 (10) |