Engine Coolant Thermostat Replacement. Buick Roadmaster 1996

For 1990-2009 cars

### Removal Procedure

Notice: When adding coolant, it is important that you use GM Goodwrench DEX-COOL™ coolant. If coolant other than DEX-COOL™ is added to the system, the engine coolant will require change sooner: at 50 000 km (30,000 miles) or 24 months.

1. Disconnect the negative battery cable. Refer to

   Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

   in General Information.
2. Disconnect the air cleaner resonator (1) and the air intake duct (2).
3. Drain the engine coolant to a level below the thermostat. Refer to Cooling System Draining and Filling .
4. Disconnect the radiator outlet hose and the clamp from the coolant pump inlet.
5. Remove the bolts (1) from the coolant pump inlet (2).
6. Remove the coolant pump inlet(2).
7. Remove the thermostat (4) and the gasket (3).
8. Clean the gasket surfaces of the water pump inlet(2) and the water pump.

### Installation Procedure

1. Install the thermostat (4) and a new gasket (3).
2. Install the coolant pump inlet (2).
3. Install the bolts (1).

Tighten
Tighten the bolts to 28 N·m (21 lb ft).

Notice: 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 the service procedure. Do not use paints, lubricants, or 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.

4. Connect the radiator outlet hose and the clamp to the coolant pump inlet.
5. Install the air intake duct (2) and the air cleaner resonator (1).
6. Add the engine coolant. Refer to Cooling System Draining and Filling .
7. Connect the negative battery cable.

Tighten
Tighten the negative battery cable bolt to 17 N·m (13 lb ft).

8. Start the engine. After the engine reaches normal operating temperature, check for coolant leaks.