Engine gets hot but fans do not operate.
Fans work on low speed with air on.
Fans work on high speed when engine temperture sensor disconnected.
What is probable cause?

 

my guess...engine temp sensor or harness is bad. try cleaning the plug and if no then change the temp sensor.

 

Its the sensor near where the radiator hose goes in. Its like $20 to replace one from autozone. I had mine go bad in a bad traffic jam in a blizzard and it was overheating. Good luck!

 

Replaced coolant sensor, now working!

 

Glad to hear it! I was stuck in a traffic jam and called my borther who logged onto the forum for me, typed in a message and got a reply and called me back in about 15 minutes! I think it was Canadian Max or something like that who helped me out. Happy to pass the info along.