Cooling System
NOTICE! Do not run the engine without the thermostat
as the engine is likely to overheat.
Replacing the Engine Thermostat
3.0 Liter Engines
50535
1. Loosen hose clamp 2.
2. Remove hose 1 from thermostat housing 5.
3. Remove O-ring 3 and thermostat 4 from housing.
Discard thermostat. Inspect O-ring and, if dam-
aged, replace.
4. Insert new thermostat and O-ring into housing.
5. Reattach hose and hose clamp. Torque clamp to
27–43 in. lb. (3.1–4.9 Nm).
4.3L–5.7L Engines (Raw Water Cooled)
50536
For instructions on replacing the engine thermostat on
closed cooling engines, please see the Do It Your-
self manual.
1. Loosen and remove long bolt 1; save for reuse.
2. Place lifting eye 2 in a secure location; you will
need to reattach it later.
3. Loosen and remove short bolt 3; save for reuse.
4. Remove thermostat housing 4.
5. Remove thermostat 5, O-ring 6, and gasket 7
from intake manifold 8. Discard gasket and ther-
mostat. Inspect O-ring and, if damaged, replace.
6. Clean intake manifold and thermostat housing
surfaces where the gasket makes contact.
Remove any remnants of the old gasket.
NOTICE! Take care not to drop any debris into
the intake manifold. Place a rag in the intake
manifold to keep debris out; remove when clean-
ing is completed.
7. Place new gasket, new thermostat, and O-ring
into the groove in the intake manifold.
8. Replace thermostat housing.
9. Install bolts and lifting eye.
10. Torque bolts to 18–30 ft. lb. (25–41 Nm).
Maintenance
84 47700385 05-2009
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