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I am to the point of installing the heater in the truck cab. I need to figure out where to put the hoses on the motor. There is a port at the top water outlet on the motor. Is this the inlet line to the heater?? That makes sense to me since it is the hottest water.
My return line from the heater went to the radiator. The radiator in my truck does not have this port so I can't go there. Where do I put it back into the system?? I don't want to cut up a brand new aluminum radiator to put the port into it.
 

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Front top of cylinder head on one side and the bottom hose connection to the radiator or the port directly above it where the JWAC is plumbed into. There are a couple of previous threads in the "Topic Index"
 
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