Chevrolet 4500 HD 2023 Manual page 307

306 Vehicle Care
External Diesel Engine Cleaning
The engine does not need periodic cleaning,
nor is it recommended.
If you insist on cleaning the engine, clean it
only when it is cold, never when it is warm
or hot, and never when the engine is
running. Spraying or pouring water or other
fluids on your engine when it is warm or
hot, or when it is running, can cause serious
damage to the engine and its components,
particularly the fuel supply pump.
Handling the Radiator and Charge Air
Cooler
Cleaning the Radiator Core and Charge Air
Cooler Core
Cooling efficiency is compromised when
there is dirt or dust plugging air passages in
the radiator core and charge air cooler core
(diesel). This can also cause corrosion of
these cores. Wash the radiator core with tap
water every 24 months.
Make sure to turn the engine off and
remove the key from the engine control
switch before cleaning cores.
The engine, exhaust pipe, and radiator will
be hot immediately after the vehicle is
driven. Be careful around these parts to
prevent burns.
Clean the engine when it is cold.
Do not clean the radiator, charge air cooler
(diesel) and their surrounding areas using
water that is supplied under high pressure.
Doing so may cause damage.