Impala V8-5.3L VIN C (2006)
Control Module HVAC: All Technical Service Bulletins
A/C - Gurgling Noise On Vehicle Start Up
Bulletin No.: 06-06-02-008
Date: May 22, 2006
TECHNICAL
Subject:
Gurgle Type Noise Coming From Instrument Panel (IP)/Heater Core Area at Start Up (Replace Heater Hoses)
Models:
2006 Chevrolet Impala SS Built Prior to November 1, 2005
2005-2006 Pontiac Grand Prix GXP
with 5.3L Engine (VIN C - RPO LS4)
Condition
Some customers may comment on a gurgle type noise coming from the IP/heater core area at start up.
Cause
Coolant flow within the heater core may be causing this noise.
Correction
Replace the inlet and outlet heater hoses to reverse the coolant flow though the heater core. Refer to the Inlet and Outlet Heater Hose Replacement
procedures in SI. Be sure to install the hose ends as marked. The hose ends have a different diameter and are NOT interchangeable.
For the Impala SS only: After replacing the heater hoses, reprogram the HVAC control module using SPS with the latest software contained in TIS. This
new software will allow the controller to properly bias the airflow to maintain correct heat output for the HVAC system.
