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 179 (POWER SUN ROOF)REPAIR INSTRUCTIONSSUNROOF DRAIN HOSE REPLACEMENT - FRONTINSTALLATION PROCEDURE
1999 GMC Forward Control 5.7 R, Automatic
Installation Procedure
1999 GMC Forward Control 5.7 R, AutomaticSECTION Installation Procedure
WARNING: This page is about a different car, the 2002 Buick Regal and 2002 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
- Position the front sunroof drain hose in the vehicle.
- Starting at the sunroof module, route the drain hose down the front pillar.
- Press the front sunroof drain hose onto the sunroof module drain spigot and the drain tube in the front pillar.
- Install the headliner. Refer to HEADLINER REPLACEMENT .
- Install the acoustical patch.
- Install the parking brake pedal, if replacing the left front hose. Refer to PARK BRAKE PEDAL ASSEMBLY .
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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.