How to Diagnose a Bad Cooling Fan Relay in your BMW by Tolleson Mechanic

How To Diagnose A In Your BMW by Tolleson Mechanic?

Most modern cars have electric cooling fans to pull air through the radiator to keep the engine cool.

Most modern cars have electric cooling fans to pull air through the radiator to keep the engine cool.

Thus, the cooling fans are controlled by the relays which is allowing power to the fans.

When the car temperature increases excessively, the cooling fan relay will be activated.

The following signs help you to diagnose the bad cooling fan relay in your BMW.

Failed Cooling Fan

Most common signs of bad cooling fan relay in your car are the nonfunctional cooling fans.

If the cooling fan relay fails, it is unable to supply power to the fans and does not operate.

When the car doesn’t have any forward motion, it can lead to engine overheating.

Engine Running Hot

Common problem associated with bad cooling fan relay is the engine runs hot or overheats.

If the engine is running at a higher temperature, then it is a sign of malfunctioned fan relay.

When the relay fails, it is unable to supply power for the fans to operate in your car.

The Cooling Fan Stays On

If the cooling fans are staying on at all times, this is another sign of a bad cooling fan relay.

When the relay shorts internally, it may cause power to be permanently switched on.

Depending on the wiring setup, this may force the fan to stay on even when the car is off.

Conclusion

Cooling fan relay is defined as the switch for the engine's cooling fans in your BMW.

If you suspect any cooling fan relay problems, then consult your mechanic to fix the problem.

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