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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain > OEM Issues

OEM Issues Original Equipment Repairs and/or Problems

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  #1  
Old 08-25-2008, 07:23 PM
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MajesticLT03 MajesticLT03 is offline
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fan blade wobbling

this just started like a few days ago but my fan blade wobbles and it sounds like its idling under water.. I have never messed with it so its not human error and was just curious if its about to go out or what..


it drives and idles and cools fine.. just wobbles
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  #2  
Old 08-25-2008, 07:30 PM
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Sounds to me like it's about to go.....I'd be replacing it soon, or at least keeping a REALLY close eye & ear on it....you don't want it coming loose and taking the radiator out too.

If the fan clutch has never been replaced, consider yourself lucky you got 5 years out of it (although i don't know how many miles your TB has) , and do it ASAP.
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  #3  
Old 08-25-2008, 07:38 PM
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Quote:
Originally Posted by petevw View Post
Sounds to me like it's about to go.....I'd be replacing it soon, or at least keeping a REALLY close eye & ear on it....you don't want it coming loose and taking the radiator out too.

If the fan clutch has never been replaced, consider yourself lucky you got 5 years out of it (although i don't know how many miles your TB has) , and do it ASAP.
it just turned over 79k.. now I gotta spend more money and get the Efan kit
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Old 08-25-2008, 07:51 PM
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Quote:
Originally Posted by MajesticLT03 View Post
it just turned over 79k.. now I gotta spend more money and get the Efan kit
Nope, not me.

$299 for the wiring kit, plus then you have to buy the fans. And if anything ever goes wrong with the system while you're driving, who's going to diagnose and /or fix it? And PCM4less even admits it can cause a big drain on the electrical system (that was never designed for it).

My stock fan doesn't come on very often as it is, plus, (in an emergency) I can go to any GM service dept and get the fan replaced.

Not saying that it's a bad system....it sounds great, and does free-up a little HP, but the above mentioned things are a big problem, IMO.
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Old 08-25-2008, 08:10 PM
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I've had the e-fan kit installed for several weeks now with no issues what so ever. The electrical draw isn't as bad or as high as you might think. How many people on here have mega-audio systems installed with 1000 watt or higher amps? - They draw a boat load more power from the electrical system than the fans ever will. Alvin also pull the power for the fans off the battery feed to the under hood fuse box, so other than having to charge the battery a bit more, the electrical system isn't under tremendous load. The fan parts are right off the shelf GM LS1 fans, so replacements shouldn't be too difficult to find. The only part that you would need to concern yourself with is the controller that PCMFORLESS designed, and that's on a small harness that unplugs and can be easily replaced if necessary. - I'm one of the testers and let me tell you, the kit is top notch and that small control circuit is sealed in resin to protect it from moisture.

I wouldn't hesitate and if you note my signature line, I'm tuned by Westers and not PCMFORLESS, so I'm absolutely NOT partial to them. Just letting those interested in just how good their setup is.
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  #6  
Old 08-25-2008, 09:31 PM
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Yeah I mean I helped with Efan install on Daves 04 Envoy and the kit is top notch.. its not like I cant reverse it after I install it.


I also have an Optima Redtop which helps somewhat


but I mean the fan clutch doesnt make any noise out of the ordinary.. just the wobbling gives it that under water sound to it.. and it doesnt wobble much..
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Old 08-25-2008, 09:48 PM
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I would replace it ASAP. Any time the moving parts on the front of an engine get loose the damage can be expensive. I had a balencer come off one of my Camaro's that took out the radiator and busted the rear tire when I ran over it. I also had a "flex fan" on my 72 Nova come apart and cut the upper radiator hose and put a dent in the hood (from the underside). I put a new serpentine belt on my Vette last year and found the balencer pulley was cracked....that one would have come apart if I hadn't discovered it changing the belt.
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  #8  
Old 08-26-2008, 12:33 AM
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the bearings on the water pump shaft are failing. eventually it will wobble so much it will make the hole Trailblazer shake/vibrate....
Been there- done that....
I pulled into the nearest dealer in Phoenix as I crossed arizona
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  #9  
Old 08-26-2008, 06:37 PM
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so then does it need a new water pump or fan clutch?? or both??


well hell if I need to do all that I might as well get a new serpentine belt
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Old 08-27-2008, 12:56 AM
BlazingBob BlazingBob is offline
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Is a slight wobble normal? My fan has been doing it a little for as long as I can remember. There is no noise, it hasn't ever changed or gotten worse. I also just replaced the belt and while it was off, I checked for any shaking or loosness in the shaft and pully and all is well and tight.
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