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HOMESERVICE MANUALSCHEVROLET1998SUBURBAN K2500, 7.4 J, PART TIMEREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 438 (ENGINE COOLING SYSTEM)REPAIR INSTRUCTIONSTHERMOSTAT REPLACEMENT (4.3L)INSTALLATION PROCEDURE
1998 Chevrolet Suburban K2500, 7.4 J, Part Time

Installation Procedure

1998 Chevrolet Suburban K2500, 7.4 J, Part TimeSECTION Installation Procedure
WARNING: This page is about a different car, the 2002 GMC Savana Special, 2002 GMC Savana Camper Special, 2002 GMC Savana, and 2002 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: When adding coolant, use DEX-COOL coolant. If silicated coolant is added to the system, premature engine, heater core or radiator corrosion may result. In addition, the engine coolant will require change sooner-at 50 000 km (30,000 mi) or 24 months.
  1. Install the thermostat.
  2. Install the thermostat housing to the intake manifold.
    CAUTION: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
  3. Install the bolts to the housing.

    Tighten 

    Tighten the bolts to 25 N.m (18 ft lbs).

    Fig 1: Installing Thermostat, Thermostat Housing & Bolts
    G01699529Courtesy of GENERAL MOTORS CORP.
  4. Connect the radiator hose to the thermostat housing.
  5. Install the coolant recovery reservoir. Refer to Coolant Recovery Reservoir Replacement .
  6. Install the air cleaner and the duct.
  7. Refill the cooling system. Refer to Draining and Filling Cooling System .
  8. Bleed the air from the cooling system.
  9. Inspect the thermostat housing and the gasket for coolant leaks.
    Fig 2: Installing Coolant Recovery Reservoir, Air Cleaner & Duct
    G01699530Courtesy of GENERAL MOTORS CORP.
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.