where are the engine cooling fan relays? on 2005 Chevrolet Trailblazer

check engine light is on and the temperature gets very hot when running the AC. Took to autozone and was told either one or both of the cooling fan relay's were bad. Does anyone know where they are located.

by in Muscatine, IA on June 18, 2011
1 answer 3 comments
ANSWER by on June 18, 2011
Look for Fan Relay #45 in the underhood relay box. Also there's Fan Fuse #20 which powers the relay. this is really an engine cooling fan relay but I can't find a wiring diagram for another fan relay. There's an A/C compressor clutch relay which is #44 in the same relay block which is powered by 10A A/C fuse #30. Check both of those relays and fuses. I recommend getting your car diagnosed by a Chevy specialist if you need more help. If you want to find a Chevy specialist, here's our directory link for you: https://repairpal.com/directory?address=52761&car_brand_names=Chevrolet
COMMENT by on June 19, 2011
thank you very much. autozone had me replace two relays. and the problem was just the blown fuse that powers the engine cooling fan relay. Almost paid to get it looked at.
COMMENT by on May 28, 2012
trouble shoot stated, cooling fan relay defective. where is the cooling fan relay located? or do i really have to replace the whole fan clutch?
COMMENT by on January 15, 2014
just replace my fan clutch myself and Im not a car dude at all, but very teachable as i watched a youtube vid and that was enough. But my engine light stayed on. I flipped the headligh module relay and the fan relay as suggested above and the headlights came on, so check! it's not the relay. I then looked at the fuse that powers the relay and it had a brown spot on it, wasn't really in half so to speak but looked bad. i replace it w/ one that powers the trailer headlights, took her for a spin and the light went off. Man im awesome!