fans wont work

[phil85]

i have changed my coolant sensor on the head. with it plugged up the fans dont come on.with it unplugged they work and the car runs cool but i dont know for sure because the gauge doesnt work when i do that. the plug in is getting power what else could be the problem. i have changed 1 fan relay that was not working.

[cancam99ss]

Look at my post I have the same issue let me know if someone responds....

[phil85]

mine was running about 210-220 then cooling down when the fans would work.i have changed water pump,t-stat,and the coolant temp sensor,and the #3 relay. dont blow smoke and radiator doesnt boil over,gauge only shows hot. is there another sensor or switch. if it keeps up im going to install a toggle switch for the fans.

[Cutlass]

You should monitor the engine coolant temp with a scan tool so you know how warm the thing is. The Low speed comes on at 226 degrees, high speed comes on at 234 degrees.

[phil85]

that could just be the case. i dont like seing it get over 210-215 so i unplug the sensor. what is a normal operating temp for a high mileage ls?or at what temp should i begin to worry?

[Cutlass]

You don't have to worry about damage until say 250 degrees or higher. If you want it to run cooler, consider installing a 160 or 180 degree t-stat and having the computer reprogrammed for the fans to come on earlier.

[phil85]

that sounds like a plan.i was thinking the exact same thing earlier

[Cutlass]

You could also keep your current t-stat and have the computer tuned for cooler fan temps.

[phil85]

thanks for the info cutlass, im deffinatly going to do that

[cancam99ss]

Look at my recent posts... My fans weren't working you can do one of two things replace the motors that cost $41 at advanced auto or brand new ls1 fans ... I got new fans and now she is running great glad it's fixed