4 w/dr light goes to 4hi/ all wheel dr/4 low without warning at anytime. The computer mode was replaced once under warranty at the moment it doesn't seem to be actually shifting. Also had a loud jet sound coming from the engine as if it was laboring and had to have the fan clutch assembly replaced @ a cost of over $800.

- Port Huron, MI, USA

1) since owning my 2002 Chevrolet Trailblazer, on occasion, the car would drive and sound like a semi (loud and heavy when I accelerated). 2) July 19, 2005, with 51000+ miles, the SUV continually was loud and heavy when I accelerated. Finally, the engine light came on. 3) I took it to a shop and the mechanic said it was the electric fan clutch and he had seen it brake down in several Trailblazers. Cost to replace: $732.33. I still have the old part if you need it.

- Carrollton, TX, USA

2002 trail Blazer transmission wasn't changing gears, wouldn't go over 30 mph, sounded like an airplane on a Friday night without a vehicle until Monday service department wasn't open on weekend dealership installed pressure control solenoid on valve body, filter and pan gasket and replaced cooling fan clutch with a cost of $961.78 mileage 61,024.

- Cross Plains, TN, USA

Engine cooling fan clutch stuck engaged, causing engine service light to come on. Dealer(moritz Chevy) charged $725 for repair of which $400 was labor.

- Ft. Worth, TX, USA

2002 Chevrolet trail Blazer 67180 miles. Failed cooling fan clutch. www.mycarstats.com indicates others have the same problem. GM turns a blind eye. Cost to repair is just under $600. The fan runs constantly. It is a design failure. I will never buy a GM vehicle again and I will urge all the people I know to never buy GM again.

- Spokane, WA, USA

Clutch fan is causing vehicle to be sluggish on take off. Makes a loud roaring noise, burns more gas.

- Glasgw, KY, USA

The clutch fan on our Chevrolet 2002 Trailblazer went out and the fan stayed on. It resulted in reduced engine power because the fan was pulling so much power from the motor. When our mechanic called for parts, the Chevrolet dealership had 15 on stock. Apparently Chevy is aware of this problem but has not recalled it.

- Central Point, OR, USA

While driving appox 50 mph, got hung in traffic. All of the sudden my engine coolant hot warning lamp came on. I pulled off and had to call my father to come get me. He added a small amount of water to the system. The car drove fine for the next 10 miles. After driving again for about 30 miles, it began to over heat again. Pulled off and let it set for about 30 minutes, once again added a small amount of water. Drove fine for the next couple of days. My husband and brother flushed the cooling system and added dex-cool. Drove fine for a day or so when it began overheating again. Parked the car until the following weekend when my husband flushed the cooling system again. Ran fine again for a couple of days. All of the sudden it started overheating again when I noticed that it occured during "stop & go" traffic, but when moving, the car would cool back down. My husband then replaced the clutch fan. Worked fine for one day when it bagan overheating again. Took the car last week to a dealer where they checked the code and it was wrong, so they entered the correct code. Worked fine for one day when it started overheating again. Don't know what it wrong with this thing!!!

- Powder Springs, GA, USA

Two weeks ago the clutch fan on my 2002 Chevrolet Trailblazer engaged before I left the house and never disengaged on a 15 mile trip to and from work with varying speeds (as low as residential, and as high as 70 mph). This is highly unusual for it to 'stick' in the engaged position. Usually it engages on a cold start and is off within a minute or two. I went so far as to turn off the A/C figuring this could trigger the command to engage the cooling fan. I called the dealer I usually have my work done at, and they just said to bring it by. On the approximate 25 mile trip from my workplace to the dealer, at some point the fan decelerated from the 100% engagement I had been experiencing for two days, it illuminated the service engine soon (ses) and the cruise control failed (it was in use at the time, and was dangerous in that it suddenly decelerated on its own at highway speeds). The cruise control was not functional at all. Upon arrival at the dealer, the fan had seemed to resume normal speeds, I relayed what had happened on the way here, and they hooked up the tech2 device, read the codes, cleared them, turned the light off, and then went on a test drive. No defect was noted and everything went for approximately one week. Currently, the fan engages itself to 100% at nearly all times except at high rpms or at highway speed. This occurs whether the A/C is on, whether it's a cold start, or a warm start. I can drive 20 miles on the interstate, and on roads at 40 mph the fan will slowly engage itself. At 40 mph there should be enough Ram air cooling. If I accelerate at a rapid rate, keeping the rpms high, the fan slowly disengages...but rengages shortly after the acceleration is ended (downshift, deceleration in speed, etc). This has become troublesome as it is surely causing excess wear and tear on the engine, is wasteful in that it causes outrageous fuel consumption, and is dreadfully loud on acceleration. Currently, it has not turned on the ses light.

- Goose Creek, SC, USA

Trailblazer service engine light on, engine reving, seems to be fan clutch stuck in high speed, causes poor acceleration, poor gas mileage, and costs over 500 dollars to repair. Dealer in small town states they have replaced several in the same year model truck. Due to the high cost of this repair, I am forced to drive my vehicle until I can come up with the money to repair it. Hopefully it will not damage any other parts in the mean time. There seem to be several complaints that deal with this same thing. Also, the rear brake lights keep going out.

- Bastrop, LA, USA

The fan clutch was not operating properly which caused the vehicle to overheat.

- Paris, TN, USA

Cooling fan had intermittent problems of racing when you stepped on gas, now cooling fan is racing constantly. I have been told by the dealer and Chevrolet that a new part has to be designed. No one knows how long this will take. I have been told vehicle is safe to drive, however it certainly does not sound like it and I have been stopped by police thinking I am racing engine or driving unsafely. **dimsii IVOQ entry posted after 12-12-02 cut over to artemis**770110

- Palm Beach , FL, USA

I have a 2002 Trailblazer with a air condition problem the truck has been to the dealership twice. The dealership has told us to spray the Trailblazer with lysol in the air condition vents in oder to keep the meldow smell from coming back into the truck, they are refusing to replace the air condition.

- Houston, TX, USA