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 800 (ENGINE COOLING SYSTEM)REPAIR INSTRUCTIONSCOOLANT HEATER REPLACEMENT (3.1L)INSTALLATION 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 Buick Regal and 2003 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
- Apply GM P/N 12346004, (Canadian P/N 10953480) or the equivalent to the following:
- The engine block heater seal
- The cleaned surface of the engine block heater hole
- Position the engine coolant heater element at the 3 o'clock position (2).
- Install the engine coolant heater.
Final installed position between 2 o'clock (1) and 4 o'clock (3) is acceptable.
NOTE: Refer to FASTENER NOTICE in Cautions and Notices. - Install the engine coolant heater bolt.
Tighten
Tighten the bolt to 2 N.m (18 lb in).
- Connect the engine coolant heater cord to the engine coolant heater.
- Lower the vehicle.
- Fill the cooling system. Refer to DRAINING AND FILLING COOLING SYSTEM .
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.