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DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSCHEVROLET1998SUBURBAN K2500, 7.4 J, PART TIMEREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 695 (HVAC SYSTEMS - AUTOMATIC)REPAIR INSTRUCTIONSMODE ACTUATOR REPLACEMENTINSTALLATION PROCEDURE

1998 Chevrolet Suburban K2500, 7.4 J, Part Time

Installation Procedure

1998 Chevrolet Suburban K2500, 7.4 J, Part TimeSECTION Installation Procedure

WARNING: This page is about a different car, the 2003 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.

Connect the mode actuator pushrod to the mode door lever.

Fig 1: Connecting Mode Actuator Pushrod To Mode Door Lever
Courtesy of GENERAL MOTORS CORP.
Install the air distribution case cover with the mode actuator attached.
NOTE: Refer to FASTENER NOTICE .
Install the air distribution case cover screws.
Tighten

Tighten the screws to 1.6 N.m (14 lb in).
Position the pod of the mode actuator between the steering column bracket and the ignition switch housing bracket.
Inspect that the actuator pushrod is not binding on the mode door lever.
Push the actuator toward the HVAC module case to secure the retaining tab.
Install a new adjustable plastic tie strap (1) to the base of the mode actuator.

Fig 2: Installing New Adjustable Plastic Tie Strap To Base Of Mode Actuator
Courtesy of GENERAL MOTORS CORP.
Connect the vacuum harness connectors to the mode actuator.
Position the ignition switch to the ignition switch housing bracket.
Install the ignition switch retaining bolts.
Tighten

Tighten the bolts to 5.5 N.m (49 lb in).

Fig 3: Installing Ignition Switch Retaining Bolts
Courtesy of GENERAL MOTORS CORP.
Install the hazard warning switch wiring harness to the ignition switch retainer.

Fig 4: Installing Hazard Warning Switch Wiring Harness To Ignition Switch Retainer
Courtesy of GENERAL MOTORS CORP.
Install the ignition switch bezel to the switch.
1. 12.1 Wrap the ignition switch lock cylinder wire around the base of the ignition switch bezel, as noted during removal.
2. 12.2 Align the bezel slots to the lock cylinder pins, then push to secure.
Connect the lock cylinder electrical connector.

Fig 5: Connecting Lock Cylinder Electrical Connector
Courtesy of GENERAL MOTORS CORP.
Connect the lock cylinder electrical connector to the retaining tab on the side of the ignition switch.

Fig 6: Connecting Lock Cylinder Electrical Connector To Retaining Tab
Courtesy of GENERAL MOTORS CORP.
Install the driver knee bolster bracket. Refer to TRIM PANEL REPLACEMENT - KNEE BOLSTER in Instrument Panel, Gages and Console.
Install the inside air temperature sensor aspirator duct.
1. 16.1 Use a twisting motion to secure the duct to the duct muffler.
2. 16.2 Install the duct retaining tab to the ignition switch housing bracket.
  
  Fig 7: Installing Inside Air Temperature Sensor Aspirator Duct
  Courtesy of GENERAL MOTORS CORP.
Install the IPC into position.

Fig 8: Installing IPC To Steering Column Bracket
Courtesy of GENERAL MOTORS CORP.
Install the IPC to steering column bracket retaining screws.
Tighten

Tighten the screws to 3.5 N.m (31 lb in).
Install the I/P upper trim pad. Refer to TRIM PAD REPLACEMENT - INSTRUMENT PANEL (I/P) UPPER in Instrument Panel, Gages and Console.
Recalibrate the actuators. Refer to RE-CALIBRATING ACTUATORS .