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2003 chevy trailblazer_ls_ext
1 Posts
Discussion Starter · #1 ·
A friend of the family has a 2003 TB LT w/5.3L and 68,000Miles.
He needs to sell it and is offering it to me for $6000. It is a very clean truck.
He gave it to me and my fiance to drive for a while to decide if we want it.
The only thing keeping me from handing over the money is a strange engine noise...

On a cold start up it knocks slightly... not a lifter tick, but more of a knock.
This last for a good 10 minutes of driving, until it heats up. Then it ALMOST goes away, but not quite.

Is this common? I have heard lifters ticking before, and this does not sound the same.

Any opinions or advise would be greatly appretiated.

2004 gmc
26,436 Posts
Very likely to be the electroviscous fan clutch, an extremely high failure rate item until a redesign around 2005. Costs less than $200 for a new one, unless he's had it changed already. Assuming you change it yourself. Take the serpentine belt off for an experiment for a minute or two. It may also be the AC or alternator making the noise, but see if you can localize it to the fan clutch.
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