Peterbilt Medium Duty Truck Owner's Manual - Peterbilt Motors

Engine Cooling System
Engine (Block) Heater (option)
WARNING! Do not use the heater if there are any
signs of problems. Engine block heaters can
cause fires resulting in death, serious personal
injury and/or property damage if not properly
maintained and operated. Regularly inspect the
engine block heater wiring and connector for
damaged or frayed wires. Contact your Authorized
Service Center or the manufacturer of the
heater if you are in need of repairs or information.
Preventive Maintenance
CAUTION: Always unplug the block heater
before starting your engine. Damage to the cooling
system could occur if not turned OFF
(unplugged).
Use a solution of half ethylene glycol antifreeze and half
water for best heater performance. Do not use more than 65
percent concentration of antifreeze, as a shortened heater
life will result.
After servicing the cooling system, operate the vehicle for a
day or two before using the heater. Trapped air inside the
engine needs time to escape.
PREVENTIVE MAINTENANCE (PM) INTERVALS
I A B C D E
At the first 15,000 mi./
24,000 km or at the first
PM
15,000 mi./24,000 km/
Monthly
30,000 mi./48,000 km 60,000 mi./96,000 km/
6 months
120,000 mi./
192,000km / Annually
240,000 mi./384,000 km
SYSTEM COMPONENT MAINTENANCE TASK
Recommended
PM Interval
I A B C D E
– 182 – Y53-6027 Medium Duty (R05/09)