replaced cooling fans and they wont turn on,


Asked by Sep 11, 2014 at 03:28 PM about the 2006 Buick Lucerne CXL V8

Question type: Maintenance & Repair

radiator fan went out on way home from work, replaced fans and they wont turn on.

7 Answers


Probably was nothing wrong with the radiator fan(s). Usually it's either a blown fuse or a relay that has gone bad. Oddos of both fans dying at the same time are unlikely. Look on the fuse block and see if there is a relay marked "cooling" and temporarily bypass that to see if they come one. If not, it could also be the temperature sensor is out because the sensor tells the fan that "it's hot in here, can you give me some air?"

1 of 1 people found this helpful.

The car has power to both cooling fan1 and cooling fan2 relay's under the hood. I jumped the relay terminal 87 to 30 to manually turn them on and still nothing. I pulled the power plug from the motors and there getting no power at all. I don't think it's the coolant temp sensor because the gauge on the dash board still works and I was told there is only one temp sensor in this car. I've checked all cooling fan related fuses and all appear to be good. I'm lost as to what it could be. Maybe some fried wiring somewhere?

2 of 2 people found this helpful.

I discovered a third relay for the cooling fans. I jumped that relay plus the cooling fan 1 relay and the fan kicked on but if I put the relay's back in I get nothing. I tried swapping relay's around with known good one's but still nothing.

2 of 2 people found this helpful.

do you know were it is at? coolant temp sensor

5 of 5 people found this helpful.

coolant temp sensor under egr valve. replaced tell you Monday how it goes.

2 of 2 people found this helpful.

coolant fans still wont turn on, fuses are good relays are good. any other suggestion?

5 of 5 people found this helpful.

Plese let me know if you get this problem solved.i also have this issue and I am problem shooting the wiring.

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