Cooling System - Draining and Filling

NOTE: Drain, flush, and fill the cooling system at the mileage or time intervals specified in the Maintenance Schedule in this Group. If the solution is dirty or rusty or contains a considerable amount of sediment, clean and flush with a reliable cooling system cleaner. Care should be taken in disposing of the used engine coolant from your vehicle. Check governmental regulations for disposal of used engine coolant.

WARNING: Do not remove the cooling system pressure cap or open the radiator draincock, when system is hot and under pressure because serious burns from coolant can occur.

DRAINING
To drain cooling system move temperature selector for heater to full heat with engine running (to provide vacuum for actuation ). Without removing radiator pressure cap and with system not under pressure, Shut engine off and open draincock. The coolant reserve tank should empty first, then remove radiator pressure cap.

REFILLING
1. Clean system to remove old glycol.
2. Fill system using antifreeze described in Coolant section. Fill 50 percent of capacity with 100 percent glycol. Then complete filing system with water. The thermostats in these engines allow air flow to go through them.
3. Continue filling system until full, this provides better heater performance. Be careful not to spill coolant on drive belts or the generator.
4. Fill coolant reserve system to at least the FULL HOT mark with 50/50 solution. It may be necessary to add coolant to the reserve tank to maintain coolant level between the FULL HOT and ADD mark after three or four warm-up, cool down cycles and trapped air has been removed.