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I have a 2012 kia rio I just replaced the radiator and fan and started it with the heat on and the radiator cap off to push the air out. I ran it for about 25 minutes and the fan never came on it is around 30 degree F is this normal for cold weather it was at ideal ? And the 2 hoses were you put the antifreeze in should the be the same temperature?
Hi @hass1957 Don’t know the vehicle or the coolant temp at which the fan has to operate but here’s the engine mechanical section from the service manual that may help. Go to p.117 to view the procedure to refill/bleed the cooling system. According to the manual the fan should come on at least 3-5 times during the procedure. There is no mention about the ambient temp but since the vehicle is stationary there would be no cooling air flowing through the radiator like when the vehicle is moving. The radiator repair section starts on p.129, just in case you missed a step When you ran the engine to bleed the air out did you notice the coolant “flowing” in the neck of the radiator, indicating that the thermostat had opened? There are two fan relays in the fuse box i.e. low fan and high fan which control the speed of the fan. They are operated by the emc (engine management control unit) in the vehicle. The coolant temp sender is also connected to the emc and presumably when the coolant reaches the requisite temp, the relay would be operated to turn the fan on. Maybe check the connections to the temperature sending unit and also the fan electrical connections
