What components are needed in this electric fan control circuit?

The diagram shows a fan relay, battery, temp sensor, a three-position ON/OFF/ON switch, a fan-on indicator light, two diodes, and the electric fan itself.

How does the A/C system turn on the electric fan in this diagram?

A line labeled 'TO A/C' connects to the relay control circuit through a diode, so the A/C can energize the fan relay.

What controls the fan relay in this diagram?

The relay is controlled by a temp sensor and a three-position ON/OFF/ON switch, with an A/C input through a diode; a 'fan on' light indicates when the circuit is active.

Where are the diodes placed in this e-fan wiring diagram?

One diode is placed across the fan motor (lower left) and another is in the line labeled 'TO A/C' at the top right.

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Electric Fan Relay Wiring Diagram - E-Fan Control with Temp Sensor & A/C Trigger

Electric fan control wiring diagram with fan relay, temp sensor, on/off/on switch, and A/C diode

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Electric cooling fan control wiring diagram showing fan relay, temperature sensor, on/off/on switch, fan-on light, and A/C trigger diode.

AI caption March 2006 · Photo 186 of 364

This document is a simplified schematic wiring diagram titled "E-FAN CONTROL" showing how to wire an aftermarket electric cooling fan control circuit. The diagram depicts an electric fan (drawn at left with grounds) powered through a FAN RELAY. The relay coil circuit is controlled by a TEMP SENSOR and a three-position ON/OFF/ON toggle switch, allowing automatic operation via the temperature sensor or manual override. A FAN ON LIGHT (indicator lamp) illuminates when the fan circuit is energized. Power is supplied from the BATTERY. Two diodes are shown: one placed across the fan motor (suppression diode) and another in a line labeled "TO A/C," which allows the air-conditioning system to trigger the fan without back-feeding the rest of the circuit. The diagram is credited "Copyright 2004 RJM Injection Technologies, www.fordfuelinjection.com." No wire colors, gauge sizes, fuse ratings, part numbers, or specific vehicle applications are given; it is a generic conceptual schematic rather than a vehicle-specific factory diagram. A reader can learn the overall circuit topology for adding a relay-driven electric fan with temperature-sensor automatic control, manual override switch, A/C trigger input, and indicator light.

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Frequently asked questions

What components are needed in this electric fan control circuit?: The diagram shows a fan relay, battery, temp sensor, a three-position ON/OFF/ON switch, a fan-on indicator light, two diodes, and the electric fan itself.
How does the A/C system turn on the electric fan in this diagram?: A line labeled 'TO A/C' connects to the relay control circuit through a diode, so the A/C can energize the fan relay.
What controls the fan relay in this diagram?: The relay is controlled by a temp sensor and a three-position ON/OFF/ON switch, with an A/C input through a diode; a 'fan on' light indicates when the circuit is active.
Where are the diodes placed in this e-fan wiring diagram?: One diode is placed across the fan motor (lower left) and another is in the line labeled 'TO A/C' at the top right.
Who created this e-fan control diagram?: It is marked 'Copyright 2004 RJM Injection Technologies, www.fordfuelinjection.com.'