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Cooling Fan Out of Balance

17 messages,  Last post on Aug 20, 2012 at 1:12 PM

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What is this discussion about? Chevrolet TrailBlazer, Engine, SUV

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#1 of 17 Cooling Fan Out of Balance by rslagle224

Jun 19, 2008 (2:53 pm)

05 TBZ 49K Milles
 
The cooling fan spins out of balance when idling. When you press on the gas it spins even more out of whack and hits the plastic protection covering the fan. What causes this out of balance spinning and what would the fix cost me?
 
Thanks
 
Rick

#2 of 17 Re: Cooling Fan Out of Balance [rslagle224] by tidester

Jun 19, 2008 (9:24 pm)

Replying to: rslagle224 (Jun 19, 2008 2:53 pm)
Look for nicks or bends on the fan blades. They will cause imbalance and that will lead to premature (possibly catastrophic) failure.
 
tidester, host
SUVs and Smart Shopper

#3 of 17 Re: Cooling Fan Out of Balance [tidester] by jerrcrib

Jun 23, 2008 (7:52 am)

Replying to: tidester (Jun 19, 2008 9:24 pm)
check fan bolts and also check water pump bearings being worn out grab ahold of fan blades with both hands and see if it wiggles up and down or back and forth if it does either fan bolts are loose or water pump is bad. jerry

#4 of 17 fan clutch by jerrcrib

Jun 23, 2008 (8:53 am)

any one out there had to have the fan clutch replaced on any trailblazers made in 2002 up to the present. I have had two replaced . I called g.m they said they have had no major problems with this.It cost approximately parts and labor 800.00 each time.My trailblazer has 30000 original miles on it. I have had it seven years. just use it for vacations. also any control modulators for heating and air been replaced,I have bought 4 new chevrolets over the past ten years, probably no more , they donot stand behind their products anymore

#5 of 17 retriving the service enginge soon code by budman94

Aug 11, 2008 (6:05 pm)

how do i retrive the SES codes and reset the SES light?

#6 of 17 Re: fan clutch [jerrcrib] by nutrinoman

Apr 03, 2009 (4:54 pm)

Replying to: jerrcrib (Jun 23, 2008 8:53 am)
I have replaced the fan clutch once so far. At about 3 years old. Chevy told me what they told you, they don't have problems with the clutch. When the clutch ws shot the truck sounded like a harrier jump jet taking off, nothing but extremely loud whirring noise. A friend helped me with the replacement. You have to take out a lot of stuff in the front like the radiator. You also need to disconnect the transmission cooling lines that got to the radiator. If I remember correctly the clutch cost about $250 or so. I also needed to get a special wrench.

#7 of 17 Re: fan clutch [nutrinoman] by jiminee

Aug 19, 2009 (6:42 pm)

Replying to: nutrinoman (Apr 03, 2009 4:54 pm)
You can get a wrench for that fan at Advanced Auto parts.They require a deposit but u get it back when you return the tool.It comes in a box with 3 other wrenches to fit other makes & models.
 

#8 of 17 Vibration noise after hitting a bump (only right front wheel) by jiminee

Aug 19, 2009 (7:13 pm)

I have a 2003 TB with 130,000 mi on it, It has been well maintained and have only done brakes & one water pump.Runs like a charm and gets about 18 mi per gal on a trip.
I recently replaced the water pump as it had quite a bit of play in the bearings (but didnt leak) I have replaced waterpumps before & was quite surprised at this one. It was no bigger than a soup can. It was a chore removing all the crap to get to it. I thoght I could sneek it out with out pulling the radiator but it was too close a fit. I thought that after replacing it it would eliminate my whirring/fluttering sound from the engine after hitting hard bumps.. No luck...it still makes the sound. I tried shutting the engine off while in Neutral and it still is a pronounced noise but stops at around 10 mi an hour.
I am suspecting the fan clutch. I have looked online for one and found that they vary greatly in price. One was $168.00-$178.00. They have a plug on them that plugs into a sensor. My original does not have that.I have found other replacements for $60 & $80 that match mine more than these others with the electronic add-on. Anyone know why this one would be cheap?(er) when everyone else was charged $6-$800.00 for replacement????

#9 of 17 Re: Vibration noise after hitting a bump (only right front wheel) [jiminee] by burdawg

Aug 20, 2009 (6:32 am)

Replying to: jiminee (Aug 19, 2009 7:13 pm)
All TB's have the viscous clutch fan. It's not a sensor, it's the connection for the current that controls the viscosity of the fluid in the fan clutch to vary the fan speed independent of the engine speed.

#10 of 17 CLUTCH FAN NOISE by lovelove1268

Aug 26, 2009 (7:10 pm)

Replying to: burdawg (Aug 20, 2009 6:32 am)
i have a 2003 trailblazer, had problem with loud noise from clutch fan. sounds like a airplane when first start up. continues to run high for about three or four blocks. no problem with cooling system, the dealership determined the clutch fan was going out. suggested i replace it also since the radiator was out, best to replace the water pump as it could go out , and of the thermostat, well, this cost me over 1000.00 dollars. four months later, same noise, after going back to dealer, seems there is no problem as the dealer now claims, just natural sound trailblazers make. still driving, take off sound and all.

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