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 619 (HVAC SYSTEMS - AUTOMATIC)REPAIR INSTRUCTIONSVACUUM TANK REPLACEMENTINSTALLATION 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 2003 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.

Connect the vacuum check valve (2) to the vacuum tank (1).

Fig 1: Installing Vacuum Tank To Hinge Pillar
Courtesy of GENERAL MOTORS CORP.
Position the vacuum tank (1) to the vehicle.
Connect the engine harness vacuum connector (5) to the vacuum check valve (2).
Connect the I/P harness vacuum connector (4) to the vacuum check valve (2).
Have an assistant position and hold the vacuum tank (1) against the hinge pillar (3).
NOTE: Refer to FASTENER NOTICE .
Utilizing the opening between the fender and the door, install the vacuum tank (1) to hinge pillar (3) UPPER retaining screw FIRST (net locating position), then install the lower screw.
Tighten

Tighten the vacuum tank retaining screws to 3.5 N.m (31 lb in).
Close the RH door.
Remove the protective tape from the edges of the RH fender and door.
Install the PCM. Refer to POWERTRAIN CONTROL MODULE .
Install the wheelhouse filler panel. Refer to WHEELHOUSE FILLER REPLACEMENT in Body Front End.
Install the tire and wheel assembly. Refer to TIRE AND WHEEL REMOVAL AND INSTALLATION in Tires and Wheels.

RENDER: 1.0x

NO RELATED

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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.