PJ161
New member
My 604 came from the factory with an in line block heater, thus assuming they are recommended by the manufacturer. It heats the water in the return hose and circulates coolant by the convection method. The entire system is heated, including the cab heater. It's easily replaceable simply by removing two hose clamps. I don't like freeze plug block heaters, as their not as easy to replace if needed and they don't last as long in my opinion, but then again, that's just me. PJ