Radiator fan always on but No temp warning light

25th April 2023, 00:20

Hello to all
Looking for a solution to a wierd problem started the last 2 days on my saxo 1.1i 2000

For some reason the radiator fan stays on at full power until it drains the battery but without the red warning temp light .

I have replaced the 3 relays at the front, i have a new temp senson and water sensor 3 weeks now after installing a new head gasket. the car was fine till sunday ,i parked it and during the night,dont know exactly after how long, the radiator fan started working mystiriously till it drained the battery. When i installed a new battery the fan started working on full again .
I have removed the Fuse 3 (30) on the engine bay until i find a fix .
Does anyone know if there is a fan control unit installed somewhere in the car?

26th April 2023, 18:24

If it's an ecu with 3 plugs, the fan is controlled by the ECU.

There is a fault if the fan stays running, you need to have the fault code read to pinpoint the problem.

does the car run okay otherwise?

do you have air conditioning?

1st May 2023, 10:36

Quote:

Originally Posted by MartinObviously

do you have air conditioning?

My thoughts as well. If the aircon pressure sensor goes wrong, the fan comes on. That thing usually does not show up on the dash.