Peterbilt 220, Operator'S Manual

Page: 105 / 136

Topping Up Coolant
WARNING
When the coolant is hot, there is an
overpressure in the cooling system. If
circumstances dictate that it is neces-
sary to top up the coolant when the
engine is warm, unscrew the filler cap
carefully one turn to relieve the over-
pressure. Take adequate precautions
against burning by, for example, plac-
ing a cloth over the cap. Coolant is a
toxic fluid. Contact with the skin should
therefore be avoided. Also see
Lubri-
cant, Engine Coolant and Fuel Specifi-
cations
on page 116
WARNING
To prevent damage to the engine
block, topping up with cold coolant
when the engine is hot must be done
slowly and with the engine running.
WARNING
Do not loosen the filler cap of the cool-
ing system when the cab is tilted. The
filler cap houses the coolant level sen-
sor. Take necessary precautions to
protect the sensor from damage when
removing it.
1. Turn the rotary knob for the heating
temperature control to "maximum hot".
2. Open the front panel.
3. Remove the black filler cap from the
cooling system reservoir.
4. Run the engine for several minutes.
5. Stop the engine and check the coolant
level.
6. If necessary, top up to the bottom of
the filler opening.
Always use coolants which meet
specifications. See
Coolant According to
Specification 74002 on page 117 .
NOTE
Take care not to damage the coolant
level sensor when removing and re-
placing the reservoir filler cap.
Special Coolant Fill
Instructions
CAUTION
RADIATOR FILL PROCEDURE RE-
QUIRED FOR THIS VEHICLE
MAINTENANCE - Topping Up Coolant
Y53-6078-1B1 (12/18/18) 103
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