Thermostatically Controlled Electric Fans: Description
Electrically-driven fans are actuated by thermal relay switches. Thermal switches turn fan motor on when necessary and shut fan motor off when not needed. Air conditioned vehicles are equipped with over-ride switches. These switches turn fan motor on whenever air conditioning system is operating. When system is turned off, fan motor control is returned to thermal relay.
THERMAL SWITCH OPERATION
| Operation | Temp. | |
|---|---|---|
| Cut-In Temp. | ||
| Stage I | 192-201°F (89-94°C) | |
| Stage II | 203-212°F (95-100°C) | |
| Cut-Out Temp. | ||
| Stage I | 178°F (81°C) | |
| Stage II | 189°F (87°C) | |