Question about 2003 Chevrolet TrailBlazer

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Multiple issues here with my 2003 LTZ Trailblazer, long story so please bear with me here. It started with what sounds like the fan overworking, loud... but the temp has been fine. Then the service engine light came on a couple days later. I took it for a regular oil change (Meineke), and asked them to also check the problem code on the computer - which said it was the fuel/air mix...?? They couldn't figure out the problem. I took it to a mechanic, where I started it, opened the hood - and he instantly said " it's loud because it needs a water pump". Had that replaced, but nothing changed sound-wise. Looked around sites like this online, and determined (guessed) that it must be a faulty fan clutch. I bought one and replaced it, but of course - the sound continued. I asked around, and without seeing my truck some guessed it was probably a vacumn leak (judging by the code I gave them). I took it to another mechanic two days ago, he took it for a drive - came back and said the loud sound is the wheel baron. I told him that sometimes even in park it will sound louder than it should... he said well it's possibly something else contributing - but the wheel baron definitely needs to be replaced. Well, long story even longer... I schedule that for repair later this week, and today on the highway all of a sudden my truck slips out of gear. I pull off the road, try getting back on but the RPMs are about 2000 higher than normal to move at a normal highway speed. I stopped at a gas station and checked the transmission fluid (which was a quart and a half low), filled but of course - filling this did not fix that problem. Could the loud sound been the transmission going all along I wonder? If the transmission is shot, is it possible to buy a rebuilding kit - or would I have to buy new? Any suggestions?

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What code is it pulling up? Have you checked all the vaccum hoses? To answer your question about the tranny, yes they can be rebuilt, no need to buy a new transmission. Cost is around $2,600 to get it rebuilt. But, let me know what code is popping up.

Posted on Mar 16, 2011

  • triumph13 Mar 22, 2011

    Thanks for the reply. Great estimate on the price for rebuild - they priced it out at exactly $2,600. They are doing that work now, I don't have that exact code for the service engine light - I was there when they put it on the computer, and saw 'fuel/air mix '... but unfortunately, didn't write the numbered code down. I can get it when I get my truck back after the trannys rebuilt(couple days). Thanks again.


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It has been my exprience that you can buy a rebuild kit for any vehicle ,but I would try changing transmission fliuld and filter run engine about an hour or so to get fluid circulating and warm ,then change fluid and filter again this will clean dirt & sedaments out .also when you change fluids second time add a Quart of no slip Transmission additive ,this is really good for older trans.

Posted on Mar 17, 2011


Transmissions are only new one time
That is on the assy line when being built

Transmissions do have rebuild kits
There are three,different types,plus
other parts,plus hard parts if necessary

That work is done at a trans repair shop,
not in your driveway

The average trans rebuild or reman is
$1200 to $5000 depending on application

Your trans slipped at the end of your story,
so I can't say it needs to be rebuilt,if the
slipping just started

I don't think all the assorted noises was the trans

Posted on Mar 16, 2011

  • Freddy Jul 13, 2011

    First of all, you need to find a trustworthy and competent mechanic, and stop making shotgun repairs. Since you did not describe the noise under the hood, but described it as being in the front, I would have the belt tensioner and idle pulley checked.
    As far as the check engine light, this could be any number of things, the fault code is needed to diagnose the problem. Has the throttle body ever been cleaned?
    As far as the transmission, if it has over 100K miles, it could be time for an overhaul. Also running it with a quart and a half low is not good either.


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