H3 V8-5.3L (2008)
Heater Hose: Customer Interest
Interior - Rattle/Buzz Noise From Behind Radio
TECHNICAL
Bulletin No.: 08-08-59-003
Date: October 08, 2008
Subject:
Rattle / Buzz Noise From Behind Radio at Idle and/or While Shifting Vehicle Into Gear (Reposition Heater Hose Bracket and Install Strap)
Models:
2008-2009 HUMMER H3
2009 HUMMER H3T
with 5.3L Engine (VIN L - RPO LH8)
Condition
Some customers may comment on a rattle or buzz type noise that is heard from behind the radio at idle, usually in the 700 to 900 RPM range. Other
customers may comment that the noise is present when shifting the vehicle into gear.
This noise may be reproduced typically with the engine idling and slowly sweep through the 700-900 RPM range or by brake torquing the vehicle in
(Forward or Reverse) gear.
Cause
The heater hose bracket may not be properly orientated and the heater core pipes may set up a resonance causing the noise.
Correction
Reposition the heater hose bracket and install a nylon tie strap around the heater core pipes using the steps below.
1.
Open the hood.
2.
Remove the engine cover. Refer to Upper Intake Manifold Sight Shield Replacement in SI.
3.
Locate the heater hose bracket on the front of the cylinder head.
