UNEVEN AIR TEMP. BETWEEN LEFT AND RIGHT HEATER OUTLET DUCTS. Saturn Saturn 1991

For 1990-2009 cars

# UNEVEN AIR TEMP. BETWEEN LEFT AND RIGHT HEATER OUTLET DUCTS

#### SUBJECT: Uneven Air Temperature Between Left and Right Heater Outlet Ducts (Install New Heater Core Cover)

#### MODELS AFFECTED: All 1991-1992 Saturns built before, and including VIN NZ147087.

CONDITION: Some owners may notice a difference in air temperature between the air coming out of the left and right heater duct outlets.

CAUSE: Cold and warm air moving through the HVAC module is not mixing completely.

CORRECTIVE ACTION: Install a new heater core cover P/N 52454598 that has molded-in baffles according to the following procedure. This will mix the warm and cold air in the heater duct before it exits the outlets.

#### PROCEDURES

#### Removal

1. Remove left and right lower trim panel extensions by disconnecting lower Velcro. fasteners and pulling out at upper clip locations. (See figure 1)

(See figure 2 for steps 2-3)

2. Remove screws on lower heater duct.

3. Drop heater duct straight down and carefully slide out sideways.

#### NOTICE: Take care not to damage heater duct-to-rear floor heater duct seal.

(See figure 3 for steps 4-5)

4. Release temperature cable hold down clip from lower heater core cover by carefully lifting up on plastic tab, while pushing down on top of cable.

5. Squeeze temperature valve pin and pull temperature cable straight off.

6. Remove screws and heater core side cover. (See figure 4)

7. Remove screws and lower heater core cover. (See figure 5)

#### Installation

#### IMPORTANT: New heater core cover has molded-in baffles to mix air in heater duct. Make sure the heater core cover to be installed has these baffles.

1. Install new lower heater core cover and screws. (See figure 6)

2. Install heater core side cover and screws. (See figure 7)

3. Push temperature cable over temperature valve pin and snap temperature cable hold down clip over temperature cable holder. (See figure 8)

4. Install heater duct by carefully sliding in sideways and up into position.

#### Notice: Take care not to damage rear floor heater duct seal.

5. Install screws on lower heater duct. (See figure 9)

6. Install left and right lower trim panel extensions. (See figure 10)

PARTS REQUIREMENTS: 52454598 Heater Core Cover

CLAIM INFORMATION: To receive credit for this repair, submit a claim through the Saturn Dealer System as follows:

Labor Case Operation Type Description Code Time ---- ----------- --------- ---- VW Install New Heater Core Cover D2260 0.7 hrs

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.