LT4 Fan won't run... car overheats

[IslandGirl33]

My car overheated the other day. A mechanic found that the fan was not turning on. He checked the relays and changed the censor but still not working. The fan does run when the AC is on but will not turn on when the engines gets too hot.

Any ideas?

 

[starfire54]

coolant fans not working

My car overheated the other day. A mechanic found that the fan was not turning on. He checked the relays and changed the censor but still not working. The fan does run when the AC is on but will not turn on when the engines gets too hot.

Any ideas?

I have the exact problem with my LT4. The service manual states that the ECT sensor is bad. They also state that you can command the ECU to turn the fans on manually. I have not yet determined how to perform this task, but I will and let you know. Have you resolved your issue?