CTS V6-3.2L VIN N (2003)
Oil Cooler: Description and Operation
Engine Oil Heat Exchanger
The engine oil heat exchanger is mounted to the top of the engine block, under the intake manifold flange. Oil is pumped through the oil cooler inlet pipe
to the heat exchanger, back through the oil cooler outlet pipe, and then to the oil passages in the engine for lubrication. The exchanger provides the
following 2 functions:
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Engine coolant warms up faster than the engine oil. During cold operation, the coolant warms the oil and provides better flow during cold engine
operation.
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After the engine reaches normal operating temperature, the engine oil temperature will exceed the engine coolant temperature. The coolant flowing
through the engine oil cooler will absorb heat from the engine oil. Cooling the engine oil extends oil life and helps reduce internal engine wear.
