Service Cooling System - Navistar MaxxForce 7 Operation And Maintenance Manual

SECTION 5 – MAINTENANCE SCHEDULE AND SERVICE PROCEDURES
Service Procedures (cont.)

SERVICE COOLING SYSTEM

Service Interval: 300,000 miles (483,000 km), 12,000 hours, 60
months, or 5 years
WARNING: To prevent personal injury or death, do the
following when removing the radiator cap or coolant tank
cap:
• Allow the engine to cool for 15 minutes or more.
• Wrap a thick cloth around the radiator cap or coolant tank
cap.
• Loosen cap slowly a quarter to half turn to vent pressure.
• Pause for a moment to avoid being scalded by steam.
• Continue to turn cap counterclockwise to remove.
It is recommended that the coolant be replaced using a coolant
extraction tool. The advantages to using this tool are; the coolant
system will evacuate and fill more completely, in less time, and
in a sanitary fashion. Extraction and filling is done through quick
disconnect fittings installed in the radiator end tanks from the
factory.
1. Park vehicle so the engine is level and shut engine off.
2. Set parking brake and shift transmission to Park or
Neutral.
3. Drain the coolant using one of the following two
methods.
NOTE: If using the coolant extraction service tool method, order
KL500NAV - Navistar Coolant Management Tool Kit.
vehicle is not equipped with a male quick-connect fitting at the
coolant drain location, see your authorized service provider for
part and installation.
Coolant Replacement Using Extraction Service Tool
1. See instructions included with the extraction tool for
proper operation.
2. Both the high temperature and low temperature radiator
must be drained.
If the
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