Document ID# 757369
2001 Oldsmobile Alero
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Thermostat Housing Replacement

Removal Procedure

Drain the cooling system. Refer to Draining and Filling Cooling System .
Remove the air cleaner. Refer to Air Cleaner Assembly Replacement in Engine
Controls-3.1L.
Remove exhaust crossover pipe. Refer to Exhaust Crossover Pipe Replacement
in Engine Exhaust.
Disconnect the surge tank line fitting from the coolant outlet.
Remove the thermostat housing to intake manifold bolts.
Remove the thermostat housing outlet and thermostat.

Installation Procedure

Install the thermostat and housing outlet.

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.

Install the thermostat housing bolts. Tighten
Tighten the thermostat housing bolts to 25 N·m (18 lb ft).

Install exhaust crossover pipe. Refer to Exhaust Crossover Pipe Replacement
in Engine Exhaust.
Connect the surge tank line fitting to the coolant outlet. Tighten
Tighten the fittings to 21 N·m (15 lb ft).

Install the air cleaner. Refer to Air Cleaner Assembly Replacement in Engine
Controls-3.1L.
Fill the cooling system. Refer to Draining and Filling Cooling System .
Inspect the system for leaks.