The radiator fan is running until the battery drains, temperature sensor?

Tiny
SUZIB1889
  • MEMBER
  • 2014 BUICK ENCORE
  • 110,000 MILES
Hi, the radiator fan is running until the battery drains. Is this due to a temperature sensor and if so which one?
Friday, October 20th, 2023 AT 3:03 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,740 POSTS
Hi,

When the ignition key is turned off, the power is cut from the sensor, so at this point, I don't feel that is the cause.

On the other hand, the fan relays have power at all times (at least two of them). If a relay has failed and is in the closed position, power will constantly run to the fan motor.

I attached the wiring schematic below so that you would have a reference. Here is what I need you to do. First, there are three fuses in the under-hood fuse box that I need you to remove one at a time to see which one turns off the fan. (See attached pic).

Do this and let me know which one does it so I know which relay to check.

Take care,

Joe

See pics below. Note: There could be a constant ground being provided to the relay as well. We need to check one thing at a time.
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Friday, October 20th, 2023 AT 10:18 PM

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