Safety Warning
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 MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 132 (HEATER SYSTEMS)REMOVAL & INSTALLATIONAUXILIARY HEATER CASEINSTALLATION
1999 GMC Forward Control 5.7 R, Automatic
Auxiliary Heater Case: Installation
1999 GMC Forward Control 5.7 R, AutomaticSECTION Installation
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2002 GMC Savana Special, 2002 GMC Savana Camper Special, 2002 GMC Savana, 2002 Chevrolet RV Cutaway, and 2002 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
- Install the auxiliary heater into the vehicle. See Fig 2. Raise the vehicle. Support the vehicle with safety stands. Install the retaining nuts to the underside of the auxiliary heater.
- Connect the heater lines to the underside of the auxiliary heater. Install the one retaining nut to the auxiliary evaporator underbody rear tube assembly to the core (if equipped).
- Install the heater and heater line cover to the underside of the auxiliary heater. See Fig 1. Remove the safety stands. Lower the vehicle.
- Connect the electrical connectors to the auxiliary heater. Install the air distribution duct upper. Install the air distribution duct lower.
- Install the left rear corner garnish molding. Install the left rear quarter trim panel. Evacuate and recharge the A/C system (if equipped). Fill the engine coolant.
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.