If your radiator fan doesn't work, don't automatically assume you've got a bum fan motor.

Radiator fan relay

Electric radiator cooling fans use a lot of juice. Soh carmakers use of goods and services a fan electrical relay to switch them on and off. If your radiator fan doesn't form, don't automatically don you've got a mooch fan motorial. First test the fuse for the radiator fan. If it checks out, screen the radiator winnow electrical relay.

Here's how to test a radiator fan relay. Unplug the electrical connectors to the radiator fans. Then turn your A/C to the MAX position and start the engine. Purpose a multimeter to check for top executive at the unplugged fan connectors. If you don't see 12 volts at the connectors, the fan isn't getting power from the relay. The sports fan relay is normally located near the worst of the locomotive compartment on a metal frame member. The metal acts arsenic a passion sink in to keep open the fan relay cool. So, unplug the connector at the relay and reiterate the check for power. If you generate power, you've got a behind relay. If you aren't getting mogul at the relay, you've got a more serious wiring or computer problem, and that's a job for a professional. But you can easily replace a bum electrical relay yourself.

Thermal grease on a radiator fan relayStart past removing the old relay and checking for corrosion around the mounting surface. DIYers often sporting supervene upon the relay without removing the corrosion. That's a ethical drug for a repetition failure. Instead, sand off all the corrosion until you beget to undraped metal. Then apply a generous amount of thermal grung to the back of the new sports fan relay (see photo, right).

Secure it to the metal-looking frame and let the grease splosh out on all sides. The new relay will power up the fans, and the thermal grung will transfer heat to the metal physical body and prevent erosion.

— Rick Muscoplat, Automotive Editor in chief

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Source: https://www.familyhandyman.com/article/automotive-stop-repeat-failures-on-radiator-fan-relays/