How to Wire a Cooling Fan Relay

How to Wire a Cooling Fan Relay

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The venerable radiator cooling fan has been a main stay in automotive cooling systems for many years. Gone are the days of the fan clutch, except in certain applications. Most vehicles manufactured after 1990 do have a cooling fan and relay. A relay is used due its ability to absorb voltage spikes and shorted circuits. Relays are strong components with many years of being put to the test.

The value of this section is to inform you of how to wire an entirely new cooling fan relay in the event that your fan wiring, fan motor of relay box has been damaged beyond repair. Often times the fan motor is no longer available and a new universal fan motor is needed. Here we'll show you how to wire the cooling fan relay in a single and dual speed configuration. For drivers in cold climates the slower cooling fan speed is desirable.

We should also mention that for our explanation we'll be using a cooling sensor switch. Cooling fan switch closes the circuit to engage the cooling fan when the optimum temperature is reached. The cooling switch, also sold in a universal format, is used to trigger the relay coil and actuate it as such. In turn, the relay activates the cooling fans. Only one cooling temperature switch is ....

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