By now there is a new part to replace the vent tube or you can try fixing yours by following this TSB.
ADVANCE SERVICE INFO - FLUID LEAK FROM FRONT OF VEHICLE (ADD TEFLON TAPE TO FRONT AXLE VENT/PLUG THREADS) TECHNICAL SERVICE BULLETIN Reference Number(s): 03-04-19-003, Date of Issue: July 30, 2003 Related Ref Number(s): 03-04-19-003 ARTICLE BEGINNING CONDITION Some customers may comment on a fluid leak from the front of the vehicle. Diagnosis may lead to a concern of an axle fluid leak from the front axle vent connector assembly (or plug in an H2). In some cases, the vent/plug connector may be finger tight, or separated from the axle housing. CAUSE Some vent/plug connectors may exhibit a shrinkage after installation into the axle assembly, which occurs for a time during thermal cycling until it becomes dimensionally stable. CORRECTION Replacing the vent/plug connector may not repair the vehicle in some cases because the new piece may also shrink. A vent connector with a new material that will not exhibit this condition will enter production in the 4th quarter of 2003. Until the new part number vent/plug connector assembly is available from SPO, follow the recommended procedure below. This bulletin will be revised when the new part number becomes available. PROCEDURE Reseal the vent/plug connector assembly with Teflon(R) tape following these steps: 1. Remove the vent/plug connector from the axle assembly. 2. Remove the O-ring from the vent/plug connector. Inspect the O-ring for wear or cracks. 3. Wipe away any excess oil and debris with a clean cloth. 4. Mark the vent/plug connector on the flange in order to identify the starting point of the Teflon (R) tape. CADILLAC: 2002-2003 Escalade, Escalade EXT; 2003 Escalade ESV with All Wheel Drive or Four Wheel Drive CHEVROLET: 2002-2003 Avalanche, Silverado, Suburban, Tahoe with All Wheel Drive or Four Wheel Drive GMC: 2002-2003 Denali, Denali XL, Sierra, Yukon, Yukon XL with All Wheel Drive or Four Wheel Drive HUMMER: 2003 H2 with All Wheel Drive or Four Wheel Drive SECTION: 04 - Driveline Axle Page 1 of 2 ADVANCE SERVICE INFO - FLUID LEAK FROM FRONT OF VEHICLE (ADD TEF...5. Wrap Teflon(R) tape three times around the vent/plug connector threads in a clockwise direction relative to the vane/oil side of the vent. Start and stop at the mark from step 4. 6. Trim the excess Teflon(R) tape from the inner-most threads. Excessive Teflon(R) tape may enter the front axle assembly possibly causing a seal leak. Fig. 1: Trimming Excess Tape 7. Reinstall the vent/plug connector O-ring. 8. Install the vent/plug connector back into the axle assembly. Tighten the vent/plug connector to 15-20 N.m (11-14 lb ft). WARRANTY INFORMATION IMPORTANT: DO NOT tape the inner-most threads of the vent/plug. Excessive Teflon(R) tape may enter the front axle assembly possibly causing a seal leak. IMPORTANT: DO NOT USE RTV Silicone on the vent/plug. Page 2 of 2 ADVANCE SERVICE INFO - FLUID LEAK FROM FRONT OF VEHICLE (ADD TEF...
Friday, March 6th, 2009 AT 9:08 AM