so much for being able to regulate the flow of coolent through the heater, just looked to see where the oem one picks up its source for coolent, you cut the oil cooler coolent line wich is half inch adapt it up to what ever size your heaters line is, oem is 3/4" but mine is 5/8". so slowing down the flow with a valve is out of the question, unless there is a unused pluged off port near the water pump? not familiar enough with the machine yet, has any one seen any thing like that around the water pump?