Grand Cherokee 2WD V6-3.7L (2008)
Heater Core: Customer Interest
A/C - Whistling Noise With Blower ON
NUMBER: 24-003-08
GROUP: Heating & Air Conditioning
DATE: February 5, 2008
SUBJECT:
Whistle/humming sound from HVAC With Blower On
OVERVIEW:
This bulletin involves repositioning of the heater core seal on the HVAC unit and if necessary applying foil tape to the seal joints.
MODELS:
2007 - 2008
(WK)
Grand Cherokee
2007 - 2008
(WH)
Grand Cherokee (International Markets)
2007 - 2008
(XK)
Commander
2007 - 2008
(XH)
Commander (International Markets)
NOTE:
This bulletin applies to vehicles built between June 1, 2007 (O701XXMDH) and November 1, 2007. (1101XXMDH).
SYMPTOM/CONDITION:
Vehicle operator may complain describe that when the HVAC system is on a whistle / humming sound is heard. The sound is usually observed during
3/4 & full blower motor setting but the sound may be able to be heard on any setting. Condition can only be heard after engine is at operating
temperature.
DIAGNOSIS:
Start engine and allow vehicle to reach normal operating temperature. Set the blower motor to 3/4 setting and set the temperature to the full hot position.
Listen for a whistle or humming sound from the I/P area. If no sound is heard adjust the blower speed to High and listen for a whistle or humming sound
from the I/P area. If the whistle or humming sound is heard proceed with the Repair Procedure.
PARTS REQUIRED:
REPAIR PROCEDURE:
1.
Gain access to the heater core (8) by removing the passenger lower knee panel.
2.
Remove glove box.
