Cooling fan staying on

2010 CHEVROLET TRAVERSE

135,000 MILES • 3.6L • V6 • 4WD • AUTOMATIC

HILO TOM

MEMBER
14 POSTS
FOLLOW

Error code po116. I changed the engine coolant temperature sensor and the pigtail, which was bad, but I noticed that when I start the car when it was cold that both fans are running at a low speed. The A/C is not on and no defrost. The fans are staying on all the time when I shut off the motor the fans stop. Coolant is full in radiator. Is there anybody that can help me out with this problem?

Jan 27, 2022 at 10:39 PM

JACOBANDNICKOLAS

CERTIFIED EXPERT
110,175 POSTS

Hi,

There is a fan speed control relay in the under-hood fuse box that may have failed.

Do me a favor. I attached the wiring schematic below of the cooling fan circuit. First, make sure all the fuses in that pic are good (pic 1) Also, remove the speed control relay and see if there is any evidence of a poor connection or short.

If both fans are running slow, power is controlled by that relay, so that could be the issue. Here is a link that explains how to test a relay:

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Let me know what you find.

Joe

See pics below.

Images (Click to enlarge)

Jan 28, 2022 at 8:17 PM