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 352 (ENGINE COOLING SYSTEM)REMOVAL AND INSTALLATIONCOOLING BRIDGE REPLACEMENT - L81REMOVAL

1999 GMC Forward Control 5.7 R, Automatic

Cooling Bridge Replacement - L81: Removal

1999 GMC Forward Control 5.7 R, AutomaticSECTION Removal

WARNING: This page is about a different car, the 2002 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

Disconnect negative battery cable.
Lift and support intake manifold.

Fig 1: Lifting Intake Manifold
Courtesy of GENERAL MOTORS CORP.
Drain engine coolant.
Disconnect electrical connector at coolant bridge.
Disconnect coolant hoses at coolant bridge.

Fig 2: Draining Engine Coolant
Courtesy of GENERAL MOTORS CORP.
Remove coolant bridge bolts.
Remove coolant bridge.
Remove all four seals at coolant bridge.

Fig 3: Removing Coolant Bridge Bolts
Courtesy of GENERAL MOTORS CORP.

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.