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Chevrolet TrailBlazer Maintenance and Repair



  • burdawgburdawg Posts: 1,524
    The air bags won't necessarily deploy in a front end crash. It depends on the forces involved whether the accelerometer will send the signal for deployment or not. I don't know your particular situation, but having a bruise from the shoulder harness is fairly normal in front end collisions.
    My wife ran into the back of someone at a fairly low speed (< 20mph) and the airbags didn't deploy, but there was enough damage that I had to replace the impact bar behind the front facsia.
  • burdawgburdawg Posts: 1,524
    Your blower motor resistor has probably gone out. I'm not 100% sure where it is on the TB but it's a safe bet it's in the blower plenum before the heater core but after the blower. Has anyone else had to change it? It seems to be a fairly common problem across the board. Over in the Grand Am and Alero forums it comes up all the time. It's also possible it's the switch, but less likely.
  • manicommanicom Posts: 2
    Well, the sensor is not sensing the correct outside temp! It's over 100 degrees here and the inside temp will only go up to about 80 degrees max and then for no apparent reason, it starts dropping. It'll drop all the way down to negative 27 degrees. Of course, then the air conditioner goes off. The air conditioner won't go on at all unless that temp reading is at least 50 degrees. I was sort of wanting to know what it might be before taking it to the shop to be fixed. Sometimes if you have a general idea of what it might be, you're less likely to get taken for a ride by a mechanic! I haven't had any trouble with the TB so far; this is the first. Wonder what it will do in cold weather? The heater should stay on all the time - right???
    If you hear of any fix on this, I'd appreciate knowing. Thanks.
  • wsg1wsg1 Posts: 1
    I hope you got your problem solved long ago. In case it still happens, I recently had a similar problem with my 2004 TB. It stalled and all the electrical guages were jumping and clicking even though the engine wasn't running. When I had it towed in it worked fine for the dealer and then for a day after I got it back. It happened again, and fortunately they were able to identify the problem as a faulty ignition switch. It now runs well once again.
  • katkinskatkins Posts: 1
    I have a 02 trailblazer 4wd. I have it about 2 years and it has 70000 miles on it. About 10000 miles ago i noticed a huge loss in power and I cant seem to figure out what is wrong. I have put a K&N filter in it, replaced the plugs, replaced the fuel filter and still hasnt regained the power loss. Can Anyone help me? I am also having a rattling from underneath the car...i can only hear it when I dont have my foot on the gas. I think it is a heat shield. Thanks for the help!
  • You might check your cat converter-I had a Dodge with a 318 that had higher mileage and there were lots of noises coming from underneath the car- I thought the Tranny was going. Turned out it was the cat converter-your comments on rattling under the car rings true to what happened there- I also had a cat go on a buick century and it lost power also.
    Hope this helps! Good Luck!
  • I had a similar rattle come from underneath my 03 Trailblazer a few years ago... only heard it while coasting and/or turning. Turned out to be an improperly placed cable of some kind, something to do the A/C if I recall. Anyway this cable would brush up against something it wasn't supposed to and created the rattle. Took the dealer a couple of visits to figure it out.
  • An afterthought, if you do have catalytic problems it should be covered under dealer warranty until 80k!It would be worthwhile to check!
  • gnajjargnajjar Posts: 3
    I also have a 2005 Trailblazer which has not only stalled but hesitates when you try to accelerate. I brough the truck to the dealer and they claim they ran complete diagnostics and nothing is wrong! BS. I am bringing the truck to another dealer this Monday, August 21. There is something definitely wrong and I will not give up until this is fixed. I'll keep you informed.
  • gevans17gevans17 Posts: 27
    My 02 TB had huge power loss and roaring noise fromm engine compartment. These vehicles have problems with the fan clutch wearing out prematurely. Mine died at 36,000 miles
    Cost 550 to replace.
  • gevans17gevans17 Posts: 27
    happens way too often, but of course, GM doesnt agree

    mine died at 36,000 miles
  • r13570r13570 Posts: 4
    My 02 TB had a fan clutch go bad @ 40K miles.
    Does sound like a common problem with this part?
    I&#146;m having another problem with the TB that I&#146;ve not figured out yet.
    The vehicle has noise behind the dash that sounds like a stepper motor or something?
    My wife says it sounds like click, click, click etc…..
    This sound is intermittent, but annoying when it&#146;s there & never stops until vehicle is shut off. &#147;We will turn the fan on high to drown out the noise&#148;.
    Have any of you experienced this problem?
    Looking for a fix, Thanks
  • adravenadraven Posts: 1
    i have the same kocking noise on my 2005 TB.
  • burdawgburdawg Posts: 1,524
    Ours did that but it wasn't constant. It would come and go. There's a service bulletin out for the mode door actuator in the fresh/recirculate air control.
    We had it changed under warranty. I don't know if that's your specific problem or not. It was pretty loud when it happened.
  • r13570r13570 Posts: 4
    Thanks...door actuator for fresh/recirculation air control.
    Good place to start trouble shooting. Will get out of AC auto mode and switch between fresh & recirculation modes to see how actuator motor performs/sounds. :)
  • gmfangmfan Posts: 188
    Might check to be sure it is not the tachometer instrument cluster making the noise. I had a 2002 TB that did this- I never got it fixed because mine was not that noticeable, but if you have one that is bad enough, it could drive you crazy. Try this:, with the car running at idle in park, press on the gas to see if the noise goes away. Good luck.
  • A few months back I read on another TB forum that a service writer told an owner that the fan clutch will tick before it fails. Mine has been "ticking" for about 40,000 miles :confuse: And still has the "roaring" sound after about the same amount of miles. I will just have to put up with it until I have the funds to take care of it or maybe GM will have a recall? ;)
  • gnajjargnajjar Posts: 3
    I took my TB in last Monday for the same reason this time to a different dealer who found nothing wrong.

    Within 1 hour the dealer called me back saying the O2 Sensor was bad. Suggest this to the dealer. I am not a mechanic by any means but I did research on this and it makes perfect sense that this would cause the stalling and hesitation.

    Good Luck
  • I'd bet lots of money its the O2 sensor. My 2002TB did that intermittently also. Every time I took it to the dealer, they said nothing was wrong. They did re program the CPU which first time did not save (unknown reason) then it did the next time. Then a few weeks later I was driving and it violently sputtered and erratically idled then stalled a bunch of times. Finally after reading tons of posts on this site and others on the web, I took it back and had them replace the sensor. Funny thing is that they said it the sensor was so corroded that it took them 2 days to get it out! Now, at least 6 months later, no problem, however the SES light has been on since. I had it reset, but just comes back on again. I figured I'd deal with light as long as the truck ran okay!

    Hope this helps.
  • My 02 TBLT has over 150,000 miles. An engine noise problem has recently surfaced after I run the car for 45 minutes or longer and at constant speeds of 70 mph. When I eventually slow down and come to a stop or slower rate of speed the engine taps so loudly that you would think that the engine is running 3 quarts low on oil. When resuming normal in town driving the engine tapping noise disappears and stays gone.

    Has anyone else had this same or similar problem?
  • You said "when idling in park, the engine just turns off. It always starts right back up...I just chalked it up to crummy gas." Did you ever figure it out for sure? I just bought (and regretted doing so even before finding this message board!) a 02Trailblazer LT. I hate it! In the parking lot of the dealer it was ok, though I didn't care for the interior cosmetically. Then as soon as we drive it home, you can feel a strange vibration, almost grinding but not quite; A random ticking in the dash; and then last night, IT DIED! We drove it about 100 miles earlier in the day and after returning from dinner, we started it up-normal-then it just shut off. My hubby & I looked at each other and immediately said uh-oh. It started back, but it happened two more times, ultimately dying out completely. We can't figure it out! Could it really be chalked up to bad gas?

    Also, we took it to a dealer for a diagnostic about a week ago and found it needed ac service, fan clutch, motor mounts, and the exhaust pipe is bent-dealer estimated at least a $1,000 repair for the exhaust alone, altogether more than $2600!!! We took it to a local business and he said that the fan clutch was fine, and the only thing wrong with ac was a serpentine belt (replaced for $83!) but now with all this, I am thinking I made the worst decision of my financial life!!!

    ANY advice would be great! :cry: :confuse: :lemon:
  • Well, I haven't had that problem since I started regularly using a fuel cleaner additive ( Lucas brand fuel system tune up...most of your better parts stores will stock it), so I am assuming that it was bad gas. Also, apparently the TB is very sensitive to bad fuel....recently, on a 900 mile trip, of course...300 miles into my trip, the Service Engine Soon light came on, right after I had filled up. While the SES was on, my cruise would not operate! Finally, after I located a parts store close to the interstate and got some additive, my light went off and my TB resumed normal operation. Until the next fill up....within 5 miles the light came back on and my cruise quit! But, that was about a month and a half ago, and since then I have had no troubles.
  • Thanks...will send hubby out on an additive mission! :)
  • another suggestion....I didn't see how many miles your TB had, but a minor tune up might also be in order. GM uses platinum plugs that are "supposed" to last 100k miles, but I changed mine at about 87k and it helped a lot. And, while you've got the air intake snorkel off, invest in a 3 dollar can of throttle body cleaner (make sure it is safe for fuel injection!!)and clean the butterfly on your throttle body. Tell your hubby to leave the TB running, and it is a simple process to open the butterfly and spary clean all the carbon and junk off of it. A little note on the plugs....02 TB use a different plug than all the others, and a l;ot of parts stores do not stock it. THEY ARE NOT INTERCHANGEABLE WITH NEWER YEAR MODELS!!! Call your parts store ahead of time and make sure they have them, and don't let a lazy parts dude talk you into buying plugs for a newer year model. Trust me, been there.
  • The A/C is working just fine so is the heat, but the floor board on the passenger side is soaked. Does anyone have any ideas hoping to be able to fix it with out spending a fortune. We were thinking heater core but i dont think so and the fluid that is in the carpet is clear so any ideas please let me know. Thanks alot
  • In my opinion the drain hose to the condenser area is clogged. (usually leaves or trash)
    Drain hose/tube is located on lower passenger firewall inside engine compartment.
    Use wire or air (low pressure) to unplug.
  • I just had this happen to me last week along with the Service Engine Soon lite. The dealership found out that it was the Accelerator Pedal Position Sensor. Thank goodness I have the GMPP or it would have cost me over $400 to have it repaired. Just thought I would let you all know.
  • My battery went dead on my 03 Trailblazer and was replaced with a new one. It starts fine, but the truck will not shift into gear. The dealer confirmed that if the battery dies the car will not go into gear. Has anyone ever experienced this before? :confuse:
  • I just bought a new 2006 Trailblazer LT. It's the first SUV and Chevy I've ever owned. I only have about 220 miles on it now. Since the first day I drove it home and continuing, there has been a very high pitched electronic tone occurring. It seems to start after I've been driving the truck approximately 15-30 minutes and gets started when I brake and it will continue for several seconds after I've let up on the brake and am pushing on the gas. It stops for awhile and then starts again the next time I brake. It's definitely not the squeal of bad brakes. I took it back this week to the service department and I got the impression the service person thought I was crazy even though 4 other people driving with me also heard it. Of course, the service department couldn't replicate the sound. I was told there is a breaking in period and should not be too concerned until about 5000 miles! I really don't think this is going to go away after 5000 miles, it's very loud from the outside of the vehicle.

    Has anyone else experienced this problem? I'm wondering if it doesn't have something to do with the Stabilitrack system. No other warning lights go off but the manual mentions there being different sounds during this system being in use....which I don't know why it would be going off as I'm only doing regular braking. Any help would be appreciated, sorry for the length of this message but the noise is driving me crazy. Next stop is a new dealership and dragging someone from the service department to ride with me.
  • burdawgburdawg Posts: 1,524
    Is it possible it's the fuel pump? If you stand behind ours or off to the side near the back you can hear it.
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