I have a 98 2.2 sunfire.
I just replaced the coolant temperature sensor so the fan actually cuts in now.
But the problem is that the engine gets too hot before the rad fan cuts in.

The coolant overflows before the rad fan cuts in.

What do you think?

I think you should find out exactly what tempature the fans are coming on and make sure you have a good radiator cap.

The statement "the fan actually cuts in now" makes me want to ask the questions......... Exactly how hot did you get this car before you fixed the fans? Did you peg the temp gauge? Did you get it so hot that engine died at any point?

I think your going to find that it's acting completely normal.

The fans on this car aren't programmed to come on until 223 degrees and that is by design.


COOLING FAN OPERATION
The Electronic Control Module (ECM) regulates the voltage to the cooling fan relay. The relay operates the fan when the engine coolant temperature exceeds 106°C (223°F) The cooling fan will turn on automatically during extended idle conditions under 5 miles per hour.




78 Corvette Pace Car For Sale-18k mi orig-Florida




(This post was edited by Hammer Time on Aug 2, 2009, 1:22 AM)

 Hi There!
This is REmy!
Im new in this site!

COOLING FAN OPERATION
The Electronic Control Module (ECM) regulates the voltage to the cooling fan relay. The relay operates the fan when the engine coolant temperature exceeds 106°C (223°F) The cooling fan will turn on automatically during extended idle conditions under 5 miles per hour.
Thanks!....

Deleted-------no links allowed............


(This post was edited by Sidom on Sep 7, 2009, 4:31 PM)