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Grand Cherokee 2WD V6-3.7L (2008)

Engine, Cooling and Exhaust > Cooling System > Heater Core > Component Information > Technical Service Bulletins > Customer Interest for Heater Core: > 24-003-08 > Feb > 08 > A/C - Whistling Noise With Blower ON

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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.

Engine, Cooling and Exhaust > Cooling System > Heater Core > Component Information > Technical Service Bulletins > Customer Interest for Heater Core: > 24-003-08 > Feb > 08 > A/C - Whistling Noise With Blower ON

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