Peterbilt Medium Duty Truck Owner's Manual - Peterbilt Motors

Preventive Maintenance
Engine Cooling System
Cooling Hoses Check the radiator and heater hoses for leaks. X X
Extended Life Coolant (ELC) Check the freeze point (see page 178). X
Check for contamination using test strips (see page 179).
X
Replace blank water filter if applicable.
X
Perform lab analysis (see page 179).
X
If lab analysis shows coolant is unsuitable for continued use
Flush, drain, and refill (see page 178).
Add ELC Extender (see page 179).
Flush, drain, and refill with new coolant (see page 178).
X
Fan clutch housing Check for air leaks. X X
Surge Tank Fill Cap Check fill cap seal at each oil change. X X X X X X
Medium Duty (R05/09) Y53-6027 – 183 –