12-21-2020, 11:57 AM
Doug. The older heaters with a row of fuses and 3 clear relays use engine antifreeze. The fresh water coil is wrapped outside of the coolant tank.
The engine coil provides heat to the coolant tank going down the road. Turning on engine preheat heats the engine antifreeze for 2 hours when starting in frigid conditions. Only turn on engine preheat for that reason.
The engine loop is engine antifreeze and is isolated from heater coolant.
The engine coil provides heat to the coolant tank going down the road. Turning on engine preheat heats the engine antifreeze for 2 hours when starting in frigid conditions. Only turn on engine preheat for that reason.
The engine loop is engine antifreeze and is isolated from heater coolant.
Rudy Legett
2003 Foretravel U320 4010
ISM11 450 hp Allison 4000R
Factory Authorized Aqua Hot Repair Center
Southeast Texas Area