Check Engine Light and/or Excessive Fan Noiseon Chevrolet Trailblazer

The cooling fan clutch may fail causing excessive fan noise and/or the Check Engine Light to illuminate.

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Average mileage : 118,292 (12,000–220,012)
Engine Affected: 4.2L 6 Cylinder
5 Years Affected: 2002, 2003, 2004, 2005, 2006
60 people reported this problem
33 people shared problem details
2003 Chevrolet Trailblazer- 4.2L 6 Cylinder86,000
I fixed both issues by cleaning the electric clutch connector on top of the radiator
11 people like thisFlag inappropiate
There is a loud humming noise from under hood-- shakes and vibrates when started up and at stoplights... transmission feels like it was slipping, would go to 3,000-3,500 rpms before shifting gears, terrible gas millage-- Found out it was the electronic clutch fan-- dealership wanted $400 for part, with 3 hours for labor, found the part at autozone for $199, saved a couple hundred bucks---vehicle runs alot better and gas millage has gotten alot better
11 people like thisFlag inappropiate
2003 Chevrolet Trailblazer- 4.2L 6 Cylinder112,600
One day I noticed a loud whining noise from my under my hood while accelerating. At first I thought my transmission or motor was acting up, I got scared. A few days later, my check engine light came on. I took it to a car parts store to get the engine light scanned and the codes indicated was pump motor circuit open and fan high speed. I have not fixed this problem yet, just researching some sites to see what this problem could be but it looks to me that the fan clutch is or went bad. Any suggestions?
7 people like thisFlag inappropiate
2003 Chevrolet Trailblazer- 4.2L 6 Cylinder180,000
bought new clutch fan at autozone for $200. installed with my son in about 2.5 hrs. dealer wanted $800 for same job.
7 people like thisFlag inappropiate
while accelerating through the low gears, the engine sounds like it's ready for take off
5 people like thisFlag inappropiate
2006 Chevrolet Trailblazer- 4.2L 6 Cylinder
It has happened twice in 120,000 miles
3 people like thisFlag inappropiate
2003 Chevrolet Trailblazer- 4.2L 6 Cylinder160,000
Have replaced the fan clutch twice since buying the vehicle used in 2004. Eventually had to replace the transmission too and suspect it was due to not replacing the fan clutch soon enough and driving it that way too long.
2 people like thisFlag inappropiate
2006 Chevrolet Trailblazer- 4.2L 6 Cylinder62,100
replacing fan clutch. At the shop right now. $800 at the dealer WOW A friend was visiting last week and has a Honda Accord. 2008 with over 100k miles. He bragged all he's done is oil changes and one set of front brakes.?? It makes me think because I've had several good size repairs on this Trailblazer already.
2 people like thisFlag inappropiate
2003 Chevrolet Trailblazer- 4.2L 6 Cylinder110,000
Vehicle sounded like an airplane taking off when RPM was increased. Had just had water pump replaced due to bad bearings, making the fan wobble. Less than 100 miles later, fan clutch failed in the "on" position and would not disengage. Had to replace fan clutch at about $450.
2 people like thisFlag inappropiate
2005 Chevrolet Trailblazer- 4.2L 6 Cylinder149,000
bearings in the water pump went out. now at 165000, fan clutch is going bad.
1 person likes thisFlag inappropiate
fix under warrenty
1 person likes thisFlag inappropiate
2004 Chevrolet Trailblazer- 4.2L 6 Cylinder
Check engine light stays on fan clutch running to fast make noise at sometimes
Check engine light on and loud noise in rear fan
No check light on just nose like an Loud fan or something I'm buying my fan clutch off of rockauto.com it's cheaper then autozone
bought used at 73000 miles. ticking sound when idling. Poor acceleration and gas ,ileage. I will replaced fan clutch and water pump as suggested.
2003 Chevrolet Trailblazer- 4.2L 6 Cylinder180,000
Chevy should have had a recall on this problem. I have changed this a few times all because the wires are not long enough and the BLUE wire breaks, (right at the connection on the fan) due to vibration. It is always the same wire. The fan then revs when you step on the gas and the eng. light comes on. You can't repair it becauce it breaks right at the rubber connection block. Mine just went again. This model also seems to go through water pumps too.
2004 Chevrolet Trailblazer- 4.2L 6 Cylinder
Rattling sound on idle & excessive leakage, and can stop the cooling fan by hand while vehicle running
2005 Chevrolet Trailblazer- 4.2L 6 Cylinder147,000
fan making noise and wobbling
2006 Chevrolet Trailblazer- 4.2L 6 Cylinder160,000
Loud humming noise that gradually turned into a clinking noise. The entire fan rattles.
2006 Chevrolet Trailblazer- 4.2L 6 Cylinder137,000
Check engine light, vibrations, poor gas mileage, whirling noise, smells of running hot at times, felt of long shift change, bogged down
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