Quote:
Originally Posted by awbrown
you are not getting any flow through the core , post a picture of how your hoses are routed and where they hook up to the engine .. if you have a new core (brand new not used ) then your problem is else where .. both tubes on the heater core should be hot ,if only one is it has to be a flow problem .. you should not have to "burp" the heater core because flow will start the minute you fire the engine ,the line coming from the water pump will have more than enough pressure to flush out any air in the heater core.. 2 more things to think about , do you have a temp gauge on the vehicle??? are you sure your thermostat is working properly???
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The 5/8" heater hose from the intake manifold near the thermostat is the supply to the heater core, the 3/4" hose to the water pump is the return.
It also depends on which intake manifold gaskets you have installed, and could be installed incorrectly. Later model engines(the center bolt valve cover ones) draw the heater supply from the passenger side REAR corner of the intake manifold and return from the core to the radiator. These engines use a different intake gasket than the older V8's, and have a restrictor installed.
Something you can do is install a "flush T" in the 5/8 hose and fill the core that way, or remove the 5/8 hose from the core, install a short length of hose to the core and fill it that way,with the radiator cap on and tight, then reconnect your hose from the intake to it. It is completely possible to have aire trapped, since the core is about 6" above the radiator neck