Radiator Pressure Cap; Coolant Surge Tank Pressure Cap - Buick 2009 Lucerne Owner's Manual

3. Fill the cooling system with the proper DEX-COOL
coolant mixture, up to the base of the filler neck.
See Engine Coolant (4.6L Engine) on page 5-27
or Engine Coolant (3.9L Engine) on page 5-31.
4. Then fill the coolant recovery tank to the
COLD FILL line.
5. Install the coolant recovery tank cap and the
pressure cap. After a day or two of driving, when the
engine is cold, check the coolant level in the recovery
tank. If it is low, refill it to the COLD FILL line.
If the coolant in the recovery tank is constantly low,
you should have a dealer/retailer service department
inspect the vehicle for leaks.
Notice: If the pressure cap is not tightly installed,
coolant loss and possible engine damage may
occur. Be sure the cap is properly and tightly
secured.

Radiator Pressure Cap

Notice: The radiator cap on your vehicle is a
pressure-type cap and must be tightly installed to
prevent coolant loss and possible engine damage
from overheating. Be sure the arrows on the cap line
up with the overflow tube on the radiator filler neck.
See Engine Compartment Overview on page 5-14 for
more information on location.

Coolant Surge Tank Pressure Cap

Notice: If the pressure cap is not tightly installed,
coolant loss and possible engine damage may
occur. Be sure the cap is properly and tightly
secured.
See Engine Compartment Overview on page 5-14 for
more information on location.
5-35