Correct Front Axle Vent Hose Routing
| Subject: | Correct Front Axle Vent Hose Routing |
| Models: | 2007-2009 Cadillac Escalade, Escalade ESV, Escalade EXT |
| 2007-2009 Chevrolet Avalanche, Silverado, Suburban, Tahoe |
| 2007-2009 GMC Sierra, Yukon, Yukon XL |
| with Four Wheel Drive or All Wheel Drive |
The front axle vent hose is mounted in the left side of the engine compartment, and may not be correctly routed. The vent hose can get misrouted and placed in a position that is lower than the front axle harness/engine harness in-line connector. In this position, the vent tube may ingest water. The front axle vent hose may be routed to the wheel side of the wheel well. It may be hanging through the opening of the wheel well in a vertical position, with the vent cap hanging down.
If you encounter a vehicle with the front axle vent hose misrouted, reroute the hose to the correct location. The hose should be mounted inside the engine compartment, in an upward position to prevent the possibility of water being drawn into the hose and axle assembly during cool-down. Tape the vent hose to the nearby wiring harness as shown. Technicians should also change the front axle fluid.
Parts Information
Usage | Part Number | Description | Qty |
|---|---|---|---|
8.25" S4WD Axle | 89021671 (in Canada, use 10950849) | Lubricant, GR, Mineral (SAE 80W-90) | 3 |
8.25" F4WD Axle | 89021677 (in Canada, use 89021678) | Lubricant, GR, Synthetic (SAE 75W-90) | 2 |
Warranty Information
For vehicles repaired under warranty, use
Labor Operation | Description | Labor Time |
|---|---|---|
F9722* | Inspect/Reroute Front Axle Vent Hose and Change Front Axle Fluid | 0.4 hr |
* This labor operation number is for bulletin use only. This number will not be published in the Labor Time Guide. | ||
