MODEL 330 OPERATOR'S MANUAL - Peterbilt Motors Company

Preventive Maintenance
NOTE: Avoid using a hydrometer for measuring
freeze point. Hydrometers have poor accuracy. Use
a Glycol Refractometer for checking antifreeze protection.
A 50/50 mixture (50% water and 50% low silicate antifreeze)
is best for year-round normal operation. This will normally
protect your engine from freezing and boil-over.
Table 8
Antifreeze Protection — Ethylene Glycol
ETHYLENE GLYCOL ANTI-
FREEZE % by VOLUME
TEMPERATURE
PROTECTION
° C ° F
0 O 32
10 –4 24
20 –9 16
30 –15 4
40 –24 –12
50 –36 –34
60 –47 –63
68 –68 –92
70 –65 –85
80 –49 –57
90 –35 –31
100 –16 4
Cooling System
Always use low silicate antifreeze with water. Premix the
coolant to maintain the correct proportion of antifreeze and
water. This will ensure the right mixture of coolant conditioner
chemicals. Install only enough low silicate antifreeze to provide
the required protection against freezing.
NOTE: If Long Life Coolant (LLC) antifreeze is used,
recharge at 150,000 miles/241,000 km.; replace at
300,000 miles/483,000 km.
• Be sure different types of coolant are not mixed. Stay
with the same coolant until a complete Replacement is
performed.
CAUTION: Never install 100% antifreeze for topup
coolant. It could damage your vehicle. The
maximum efficient Low Silicate Ethylene Glycol
antifreeze concentration for extended low temperature
operation is 68% glycol by volume.
Exceeding this 68% limit reduces freeze protection.
In an emergency, if the radiator becomes filled with water
known to contain gypsum, sulfur, or chlorine, follow the below
procedure:
• Drain the cooling system as soon as possible
• Flush the system
Model 330 PB1318 3/01 – 149 –