Newbe here, radiator cooling fans not running on my 2005 yukon denali

[trikeman]

Checked all (3) electrical relays, changed the temperature sensor, fans will run if I remove plug from temp. sensor, shut down as soon as I plug sensor back in. What is the relay under pass. headlight and behind bumper cover? Need help please reply. Thanks

 

[clandr1]

have you tested the temp sensor to see if it's bad?

 

[SLCHOE]

Do they come on if you turn your A/C on?

You replaced the Engine Coolant Temperature switch?