Chevrolet 4500 HD 2023 Manual page 253

252 Vehicle Care
higher, overheating is likely to occur, while
if it is 30% or lower, anti-corrosion function
is not provided sufficiently.
Using coolant at any coolant concentration
other than that specified may reduce
anti-freezing performance, and engine
coolant may freeze.
If the engine coolant decreases rapidly, stop
the vehicle in a safe place and contact your
dealer for advice and repair.
Checking the Engine Coolant Level
For the single cab model, the engine coolant
reserve tank is located behind the front-right
wheel. See Cab Tilting 0 239.
For the crew cab model, the engine coolant
reserve tank is under the access panel
beneath the left rear seat. See Engine Cover
0 242.
When the engine has cooled down, make
sure that the fluid level in the engine
coolant reserve tank is no lower than the
MIN line. In addition, carefully remove the
radiator cap and check to see if it is
damaged. Check that the engine coolant is
full to the filler neck. Check the engine
coolant level only when it is cold.
The radiator cap (1) opens and closes in
double action. When removing the radiator
cap, take caution not to damage the cap
and the filler neck (2).
Turn the cap slowly to the left until it
reaches a stop . Do not press down while
turning the cap.
Wait until any remaining pressure (indicated
by a hissing sound) is relieved, then press
down on the cap and continue turning it to
the left.
Also, check to make sure there are no leaks
from the radiator or radiator hose. Check for
fluid or stains on the ground showing leaks
where the vehicle is parked. Contact your
dealer if you discover leaks.