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Ranchers.net
On my son's 2001 Peterbilt with a C15 Cat has a circulating block heater. The heater works but I think it is plumbed in wrong as it gets hot but doesn't circulate the coolant.
The bottom hose comes off a block from under the cab and the top just goes into the water jacket inside the frame. It doesn't seem to heat the engine block. It also has an immersion type heater in the back of that water jacket that will warm the block.
Anybody know where to plumb the circulating one in?