New member here. Any suggestions would be much appreciated.

Last night when I started my 2000 Suburban in 29F weather, the radiator fan came on and stayed on till I shut the car off. I only noticed it last night. I purchased the car about 2 months ago and never noticed this before.

The car was sitting for more than 24 hours. My AC and defroster were both off.

Any ideas as to what I should be looking at? Coolant temperature sensor? Relay? Thermostat?

The car warms up fine and does not overheat. Runs at normal operating temp.

This car has been a nightmare and at this point, I have pumped as much $ into it as I paid for it ($3800).

Had to rebuild the tranny 2 weeks after I got it.

Again, any insight would be appreciated.

 

temp sensor, test it.

 

Thank You.

Will check that first.

 

Just one more thing.

The SES light is NOT on. Wouldn't the failing sensor throw a code?

 

no, not always. if we lived in the sahara and it was hot all the time or cold all the time it would throw codes.


I am open to be corrected by the other fellas here.