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Thermostatically Controlled Electric Fan (Fwd Models, All 2.3L Engines With A/C & 3.8L CAPRI/Mustang): Description

All 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. All air conditioned vehicles are equipped with over-ride switches. These switches turn fan motor on whenever air conditioning system is operating, and return fan motor control to thermal relay when system is turned off.

Although all electric fans operate on same principle, the following are special descriptions that apply to specific models:

Coolant temperature switch activates coolant relay to provide battery power to fan motor when engine temperature reaches 221°F (105°C); relay shuts fan off when temperature drops sufficiently. After vehicle operation or when carburetor temperature exceeds 155°F (68°C), carburetor temperature relay switch activates timer relay. Timer relay turns fan on for a period of 15 minutes or until temperature drops to 155°F (68°C) or less.

NOTE: Timer relay works only when ignition switch is turned off. Avoid working around fan with ignition off when temperature at carburetor may exceed 155°F (68°C).
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