Mechanics

GMC YUKON STEERING PROBLEM

1999 GMC Yukon • 168,000 miles

HOW TO REPLACE HEATERCORE
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December 18, 2012.




Heater Core Replacement

Removal Procedure

Drain the coolant. Refer to Cooling System Draining and Filling See: Engine, Cooling and Exhaust\Cooling System\Service and Repair.
Remove the instrument panel storage compartment. Refer to Instrument Panel Carrier Replacement See: Body and Frame\Interior Moulding / Trim\Dashboard / Instrument Panel\Service and Repair\Instrument Panel (IP) - Carrier Replacement.
Disconnect the electrical connectors, as necessary.
Remove the center floor air distribution duct.
Remove the hinge pillar trim panels. Refer to Instrument Panel Carrier Replacement See: Body and Frame\Interior Moulding / Trim\Dashboard / Instrument Panel\Service and Repair\Instrument Panel (IP) - Carrier Replacement.
Remove the blower motor cover.
Remove the blower motor. Refer to Blower Motor and Fan Replacement See: Blower Motor\Service and Repair.
Remove the steering column. Refer to the applicable procedure: Steering Wheel Replacement in Steering Wheel and Column - Standard: See: Steering and Suspension\Steering\Steering Wheel\Service and Repair
Steering Column Replacement in Steering Wheel and Column - Tilt: See: Steering and Suspension\Steering\Steering Column\Service and Repair

Roll back the instrument panel. Refer to Instrument Panel Carrier Replacement See: Body and Frame\Interior Moulding / Trim\Dashboard / Instrument Panel\Service and Repair\Instrument Panel (IP) - Assembly Rotating.
Remove the coolant recovery reservoir. Refer to Coolant Recovery Reservoir Replacement See: Heater Hose\Service and Repair.
Remove the heater hoses. Refer to Heater Hoses Replacement.

While holding the heater case to the cowl, remove the screw on the interior side of the cowl, near the evaporator pipe, if equipped.

On the engine side of the cowl, remove the 4 screws that hold the heater case to the cowl.
On the engine side of the cowl, remove the 2 nuts that hold the heater case to the cowl.
Remove the heater case.

Ask an assistant for help, if necessary.

Remove the 7 screws that hold the heater cover to the heater case.
Remove the heater cover.
Remove the heater core from the retainer.

Installation Procedure

Install the heater core into the retainer.
Install the 7 screws that hold the heater cover to the heater case. Replace the seals.
Install the heater cover.

Verify that the heater cover is properly sealed.

Install the heater case.

If necessary, ask an assistant for help.

On the engine side of the cowl, install the nuts that hold the heater case to the cowl.
On the engine side of the cowl, install the 4 screws that hold the heater case to the cowl.

On the interior side of the cowl, install the screw.

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

Tighten the following fasteners: Tighten

Tighten the screws on the engine side of the cowl to 1.9 Nm (17 lb in).
Tighten the two nuts to 2.8 Nm (25 lb in).
Tighten the screw on the interior side of the cowl to 11 Nm (97 lb in).

Install the heater hoses. Refer to Heater Hoses Replacement See: Heater Hose\Service and Repair.
Install the coolant recovery reservoir. Refer to Coolant Recovery Reservoir Replacement See: Engine, Cooling and Exhaust\Cooling System\Coolant Reservoir\Service and Repair.
Roll forward the instrument panel. Refer to Instrument Panel Carrier Replacement See: Body and Frame\Interior Moulding / Trim\Dashboard / Instrument Panel\Service and Repair\Instrument Panel (IP) - Assembly Rotating.
Install the steering column. Refer to the applicable procedure: Steering Wheel Replacement In Steering Wheel and Column - Standard: See: Steering and Suspension\Steering\Steering Wheel\Service and Repair
Steering Column Replacement In Steering Wheel and Column - Standard: See: Steering and Suspension\Steering\Steering Column\Service and Repair
Steering Column Replacement In Steering Wheel and Column - Tilt: See: Steering and Suspension\Steering\Steering Column\Service and Repair

Install the blower motor. Refer to Blower Motor and Fan Replacement See: Blower Motor\Service and Repair.
Install the blower motor cover.
Install the hinge pillar trim panels. Refer to Instrument Panel Carrier Replacement See: Body and Frame\Interior Moulding / Trim\Dashboard / Instrument Panel\Service and Repair\Instrument Panel (IP) - Carrier Replacement.
Install the center floor air distribution duct.
Connect the electrical connectors, as necessary.
Install the instrument panel storage compartment. Refer to Instrument Panel Carrier Replacement See: Body and Frame\Interior Moulding / Trim\Dashboard / Instrument Panel\Service and Repair\Instrument Panel (IP) - Carrier Replacement.
Add the engine coolant. Refer to Cooling System Draining and Filling See: Engine, Cooling and Exhaust\Cooling System\Service and Repair.
Inspect the system for leaks.

ASEMaster6371
Dec 18, 2012.


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