Print this page Notes: The Trailblazer emerged from an "upscale trim line" of the Blazer, but there's nothing upscale about its transmission problems or its wonky, unpredictable headlights.


hardly worth mentioning
Crashes / Fires:
0 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
61,670 miles

About These NHTSA Complaints:

This data is from the NHTSA — the US gov't agency tasked with vehicle safety. Complaints are spread across multiple & redundant categories, & are not organized by problem.

So how do you find out what problems are occurring? For this NHTSA complaint data, the only way is to read through the comments below. Any duplicates or errors? It's not us.

2002 Chevrolet Trailblazer cooling system problems

cooling system problem

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2002 Chevrolet Trailblazer Owner Comments

problem #17

Dec 302010


  • 170,000 miles


I have a problem with my fan clutch. Transfer case and suspension problems.

- Nh, NH, USA

problem #16

Apr 012009


  • 45,000 miles
The fan clutch on my 2002 Trailblazer have been acting up and not working properly for quite a while. From the initial startup of the vehicle, up to traveling speed of 55 mph the load jet noise, fan clutch revving can be heard. The revving up, jet noise, and lack of power from the engine and no acceleration when needed. Service engine light has come on several time P0495. Seems as though the problem has slowly got worse over the past year. Finally had to purchase a new fan clutch from automotive business and replace the part. A simple 5 minutes search of the problem on the internet showed a very eye opening response from several hundred other owners of similar Trailblazers with same exact problem. The fan clutch was replaced with a new one and the old fan clutch is still available if anyone needs to see it. The loud engine revving fan noise/like jet engine, used to happen every few days, but then it became a daily problem, hence the concern to replace the part. Bought the vehicle two years ago with 36000 miles on it and it has 56000 miles on it now. For your information of the other hundreds of owners with similar problem, here is the link.

- Bristol, IN, USA

problem #15

Jul 222009


  • 65,000 miles
My heat gauge would show fast rising temp. Of the engine. The dealer did not believe me when I told them it must be the temp. Sending unit. They said they never go bad....called later to say it was the heat sensor, replaced it, tore the thermostat out of my trail Blazer, said it was bad [I don't think so], replaced it and then said I needed to have my seven computers reprogrammed so the car would run right.[I didn't believe that either]. since everything depends on computers to diagnose everything, I had to have them do whatever the dealer said. So, I feel that I was ripped off for unneeded parts and the tune of $750. What a rip off ! ! ! !

- Moscow, TN, USA

problem #14

Apr 052009


  • 57,000 miles


Have owned a 2002 Chevy Trailblazer for three years when I purchased it made a load fan noise but it went away after a few feet now it makes the sound all the time Chevy needs to call them back before someone gets hurt or killed when the fan explodes it will happen the fan is plastic and can only take so much rpms Chevy you should do this before you have a law suit.

- Randolph, NH, USA

problem #13

Feb 012009


  • 104,000 miles
The cooling fan clutch in my 2002 Chevy Trailblazer has gone bad. There have been many other reports about this part failing on these vehicles. Causes decreased power, increased RPM's, and may cause engine destruction.

- Tuscaloosa, AL, USA

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problem #12

Jul 252007


  • 70,000 miles
When turning on my Chevy Trailblazer..sounds like a jet airplane taking off. Had it replaced last year (2007) and it's starting to do the same thing. I was told that the original fan clutch had some sort of upgrade or was it just defective?

- Santa Rosa, CA, USA

problem #11

Oct 272008


  • 110,000 miles


My "service engine soon" light came on today and I brought it in to be put on the diagnostic machine. It is reading error code PO495 cooling fan circuit error. After researching online I found that it is generally a problem with a faulty fan clutch. And that this is a very common problem for my vehicle (2002 Chevy Trailblazer). The site I visited had 279 pages of comments on this problem! statements made were that if the fan clutch malfunctions it can "explode" causing more damage.

- Rochester, NH, USA

problem #10

Nov 102007


  • 45,000 miles
Engine revs with no power, fan clutch stuck on. Started when vehicle was new. Progressively worse and had to be replaced at 50,000 miles. Six months later problem back.

- Covington, LA, USA

problem #9

Jun 032008

Trailblazer 6-cyl

  • 82,847 miles
I own a 2002 Trailblazer ls. The vehicle has acquired approximately 82,800 miles. On a least five separate occasions, while covered under factory warranty, the vehicle was taken to midway Chevrolet located at 5915 Montana ave. El paso, tx., due to recalls and various other mechanical problems. On at least two occasions, the vehicle was taken to midway Chevrolet of el paso due to an unexplained high engine noise and a light engine warning light. On each occasion, I was told by the midway reps. That nothing was wrong with the vehicle. They simply reset an electronic component which turned off the engine light warning indicator and eliminated the high pitch noise. The vehicle worked fine for a short period, then the high engine noise returned, and so did the engine warning light. I simply grew tired of going to the dealership, therefore continued to run the vehicle with the high engine noise and the engine warning light. Today, I received news from said dealership that the high pitch engine noise and the engine warning light is, and has been, due to a cooling fan clutch assembly. This non-stop mechanical problem now keeps me from a Texas state inspection sticker. To repair this problem, they tell me, will cost over seven hundred dollars. This should have been repaired while under warranty. They had several opportunities to remedy this problem. They failed to honor their responsibility. Now, I am unable to, legally, drive this vehicle anywhere in the state of Texas. From recent information gathered, this problem is all to well known to Chevy and GMC, yet they have done nothing to correct this problem. I wish to register a complaint against Chevy and midway Chevrolet of el paso for their failure to repair the cooling fan assembly problems when they surfaced and while under factory warranty. Joseph E. gaines

- El Paso, TX, USA

problem #8

Dec 192007

Trailblazer 6-cyl

  • Automatic transmission
  • 82,000 miles
The electrical gauges on our 2002 Chevy Trailblazer did not function properly when the fan clutch failed, leading to engine overheating. The overheated engine blew the head gasket before the engine itself blew up. My husband was had just backed out of the driveway and had driven about 200 yards when this happened. It is important to note that warning systems malfunctioned: There were no lights, bells or any indication that complete engine failure was imminent. There wasn't even the odor of an overheated engine. If this had happened on our local freeway I could be suing GM over my husband's injury or death.

- Huntington Beach, CA, USA

problem #7

Oct 302007

Trailblazer 6-cyl

  • Automatic transmission
  • 40,000 miles


At about 40,000 miles it started making a loud roaring noise at start up until you get about a mile down the road. I changed the plugs and air filter at 60,000 and the noise seemed to go away. It was soon replaced with a squeaking noise from the belt area. I took it in to have the belt replaced and $90 later that didn't fix the squeaking noise. After a little research on the web I found out about the fan clutch problem and the water pump bearings were going bad. So I replaced the fan clutch and the water pump myself for $300. The roar is not as bad now but still there, shifts abnormally, and now at 60 mph it jerks forward and rpms go from 1500 to 2000. I researched more on web and found that after changing the fan assembly you must get the PCM updated. I called the local dealer (maroone) and they want $104 to do that. Any information would be greatly appreciated.

- Hollywood, FL, USA

problem #6

Jul 152006

Trailblazer 4WD 6-cyl

  • Automatic transmission
  • 75,000 miles
Fan clutch has/is failing. Hangs and doesn't always release even if vehicle has been sitting for days. No 'logic' as to when it chooses to disengage. No engine fault light. Is as likely to be fully engaged on a cold morning as a hot day. Affects mileage and by inference emissions. This is a chronic Trailblazer problem per my mechanic and web complaint evidence.

- Lake Saint Loius, MO, USA

problem #5

Jun 162005

Trailblazer 6-cyl

  • Automatic transmission
  • 55,700 miles
While driving to lax airport after rounding curve to get off on airport ramp, tranmission failed. Vehicle would not move. Local airport police assisted to get me towed ($45) to police lot. Notified onstar and was towed to closest Chevrolet dealer, albertson Oldsmobile Chevrolet in culver city, California. After three days the dealer had not even looked at the vehicle. I then ha car towed to aamco transmission in orange California where after less than 24 hours I was informed transmission was completely burned up. A pump had failed and the inside of the transmisson assembly was filled with metal shavings. In October of 2003 the transmission had failed and the car had to be towed to gateway Chevrolet in la mirada, California. Car was repaired. I have also had many other problems with this vehicle including brake lights, windshield wipers, heating & air conditioning system.

- Placentia, CA, USA

problem #4

Jun 252004

Trailblazer 6-cyl

  • Automatic transmission
  • 46,850 miles
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

problem #3

Sep 102003


  • miles
Transmission went out couldn't drive-repaired/ rear window won't roll-up/seatbelt won't retract, later fixed, but still won't work on occasion/ brake lights have gone out 5+ times repaired still not operational/ water pump exploded/rear window won't lock first try/ check engine llight stays on.

- Detroit, MI, USA

problem #2

Aug 282002

Trailblazer 6-cyl

  • Automatic transmission
  • miles
Air/heat vents have a really bad odor. The dealer has cleaned and spray something in them and suggested I do the same. I have done so. This causes a severe smell in the vehicle for a couple of days that makes occupants sick, then the smell will disappear completely for a couple of weeks then return. The dealer says that it is some type of mold or mildew in the vents. This has been happening for several months.

- Apex, NC, USA

problem #1

Jun 102003

Trailblazer 6-cyl

  • Automatic transmission
  • miles
I bought a 2002 Chevrolet Trailblazer lt new about 10 months ago the truck has been in for service many times for different things as for seatbelt looking up and wont release, brake lights failing, derectionals that blowout every few days, radio/cd player wasnt working, leakage of water everytime it rained etc etc.. anyways I just took it back on 6-9-03 for seatbelt to be done again and for the derectional that failed again and also to have truck inspected I picked it up later that day and found that the inspection sticker had a wrong VIN # on it and that other work was done I left there knowing they said they dont know why the light in derectional keeps failing but they did change the bulbs { this is everytime I bring it this is all they do to fix it} on 6-10-03 the derectional wasnt working again my husband changed the light bulb this time due to the fact it takes me almost 40 mins to get to dealership.....I will be going to the dealership to ask for a copy of the history on truck and will be getting a lawyer involved and also contact the dealers commintion and channel 12 on this matter.....I payed almost 30,000 for a truck that is not worth it and I am a very unhappy costumer..

- Warwick, RI, USA

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