Refilling

First clean system to remove old glycol.
Fill system using antifreeze described in Coolant section. Fill 60 percent of capacity with 100 percent glycol. Then complete filling system with water. The thermostats in the these engines allow air flow to through them.
Continue filling system until full, this provides better heater performance. Be careful not to spill coolant on drive belts or the generator.
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, if any trapped air that has been removed.