i have 2000 2.5RS with a/c system removed

both rad fans start working when engine is just warm but not hot.

even now in cold weather and driving on hwy they spin all the time

what could be wrong?

thanks in advance for any input

This could be due to the coolant temp sensor failing, but there could be other causes. If the thermostat is only opening partially you can get slow circulation of the coolant which would cause it to get too hot in the block. A clogged heater core can cause similar problems.

 

What kind of shape is the coolant in? Is it clean? When was it last changed? Fluid level in the radiator and overflow?

How old is the thermostat?

 

Do you get good hot air with the heat on or is it just kinda luke-warm?

Does the temp gauge in the dash ever go above halfway?

Have a scanner or access to one that can read live sensor data?