Chevy Avalanche

[falcon84]

I have a 2004 chevy avalanche i think the clutch fan is going out and was wondering if there is anything i need to know about trying to change it out. Or if i should find a mech to change it.

[Stevens03]

They can be stubborn to get off... remember they are reverse threads. Otherwise it just takes some muscle.

 

Steven

[falcon84]

They can be stubborn to get off... remember they are reverse threads. Otherwise it just takes some muscle.

 

Steven

 

What are some of the signs of one going bad?

[Stevens03]

Overheating.... Cause it's slipping and not fully engaging. If your air's on.. and it's hot and you don't hear the fan.. it's not engaging properly.

 

Steven

[falcon84]

Overheating.... Cause it's slipping and not fully engaging. If your air's on.. and it's hot and you don't hear the fan.. it's not engaging properly.

 

Steven

 

I have really noticed a change in power when the a/c is on and i hear the fan a lot more now its really loud sometimes.

[Netgunner]

Have a major issue that is making me rip my hair off........

Need help.

2004 Chevrolet Avalanche 1500 Z71 4x4 V8 - 5.3L vin T 323ci - MFI GAS OHV

the issue is as follows:
Driving down the road i hear a whining noise from coming from the undercarriage when driving between 25MPH and 55MPH.
took it to the dealership and was told i needed the Ring and Pinion and Bearings changed. They wanted $3200 for the work where I purchased the parts for $300 and took a day off worked and completely did the whole job myself. Changed all the bearings (Front and Rear) and filled up with 75W90 Gear oil to porpoer levels. However the noise still exists.

 

Researching some more ran across this.

Document ID# 1453654
2004 Chevrolet Avalanche
Whine Noise From Rear Axle (Diagnose and Replace Rear Shaft with a Tuned Torsional Damper Rear Propeller Shaft) #03-04-17-001B - (Feb 3, 2004)
2002-2004 Cadillac Escalade EXT
2000-2004 Chevrolet Suburban 1500 Series Models
2002-2004 Chevrolet Avalanche 1500 Series Models
2000-2004 GMC Yukon XL 1500 Series Models, Yukon XL Denali
This bulletin is being revised to add the 2004 Model Year. Please discard Corporate Bulletin Number 03-04-17-001A (Section 04 - Driveline/Axle).
Condition
Some customers may comment on a slight axle whine heard only at certain speeds, typically between 72-96 km/h (45-60 mph).
Cause
"Inherent" ring and pinion gear whine.
All gear driven units, such as automotive rear axles, produce some level of noise that cannot be eliminated with conventional adjustments and repairs. "Inherent" axle noise can be described as a slight noise heard only at a certain speed (typically between 72-96 km/h (45-60 mph) on most General Motors® trucks). The presence of this noise is not indicative of a functional concern with the axle assembly. However, some customers may find that this "inherent" axle noise is unacceptable.
Correction
Replace the rear propeller shaft with a tuned torsional damper shaft ONLY after diagnosis concludes that it is an "inherent" rear axle noise and no physical damage or incorrect adjustment exists.
Important: If the noise is not correctly diagnosed as "inherent" and having a peak in the narrow speed range of 72-96 km/h (45-60 mph), the addition of a tuned torsional damper propeller shaft can aggravate the perceptible noise level. It is extremely important to first diagnose the rear axle noise as "inherent" before installing a new tuned torsional damper propeller shaft.

 

Diagnostic Information and Procedure for Rear Axle Noise
1. Diagnostic Starting Point - Rear Drive Axle. Refer to SI Document ID #696972.
2. Symptoms - Rear Drive Axle. Refer to SI Document ID #697220.
3. Rear Drive Axle Noises. Refer to SI Document ID #700580.
4. Noisy in Drive. Refer to SI Document ID #698120.

Rear Propeller Shaft Replacement
1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information. Refer to SI Document ID #737171.
2. Remove the bolts and the yoke retainers from the rear axle pinion yoke.

Notice: When removing the propeller shaft, do not attempt to remove the shaft by pounding on the yoke ears or using a tool between the yoke and the universal joint. If the propeller shaft is removed by using such means, the injection joints may fracture and lead to premature failure of the joint.

3. Slide the propeller shaft forward in order to disconnect the propeller shaft from the rear axle pinion yoke.
4. Slide the propeller shaft rearward in order to disconnect the propeller shaft from the transmission or transfer case.
5. Remove the propeller shaft from the vehicle and discard.
6. Install the new tuned torsional damper propeller shaft (see Parts Information below) into the transmission or transfer case.
7. Install the propeller shaft to the rear axle pinion yoke.
8. Install the yoke retainers and bolts.

Tighten
Tighten the yoke retainer bolts to 25 N·m (19 lb ft).
9. Lower the vehicle.
10. Road test the vehicle.

Dealer's parts info jargon not included here..

 

Wondering if anyone can direct me to a resolution and validity of this Document i found..