Couple things needed help with.
1. Looking for a hand drawn or OEM schematic of the heater hose connection and routing for 57 GMC with 347 engine. Rebuilt original heater box and will be ready to install soon.
2. Over heating. Fresh rebuilt 347, new champion radiator, rebuilt OEM water pump, no heater core connected yet, new180 deg thermostat (verified it opens on stove heat), new hoses. Truck hasn't been on the road yet. Over heats at after 10-15 idling. Tried burping system. Coolant doesn't go down from burping funnel, just rises a couple inches. Drilled hole in thermostat. Tried rubber glove expansion for head gasket issue. Checks ok.
Next step I guess before removing water pump is to hook up manifold heater hose to see if coolant shoots out. Anyone have some advice? Thanks
