Posted by TimWafer on November 23, 2012 at 10:55:56 from (72.43.243.210):
I'm finally getting back to hooking up the cab heater on my 656. I was trying to figure out the best places to plumb the heater core into but am a bit confused by the bypass hose in the above photo. I thought the bypass was to allow circulation through the block & head while the thermostat was closed. It appears to me that this hose connects from the waterpump to the radiator side of the thermostat rather than the head side. So how the heck does that work? it appears factory. Doesnt the water come from the pump through the block into the head and only through the thermostat when it opens?
There is an additional plug in the waterpump hidden right behind that bypass hose. I figured that might be a good spot to return the cab heater to. Theres no outlet on the head side of the thermostat so I guess I will have to remove one of the plugs in the side of the head for the hot supply.
My other question is on the other side of the engine. There is what I assume to be an engine oil cooler below the oil filter. it has two hoses into it. One connected to the lower radiator hose, the other back up to yet another port in the water pump. I assume the water flows from the lower radiator hose through some kind of heat exchanger and returns to the water pump. Is that correct?
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