Quote:
Originally Posted by chengny
You are getting basically no water flow through the heater core. The nipple on the water pump can be used in place of a nipple at the top of the radiator tank - but not in conjuction with it.
That nipple is on the suction side of the water pump. So what you are doing is sucking water from the bottom of the heater core and trying to replace it with the steam/vapor that exists at the top of the radiator tank. Although that vapor is hot, compared to water it has little BTU value.
The area of the cooling system that heats up first and gets the hottest is at the outlets of the cylinder head cooling passages. These connect directly to the intake manifold. Also, and more importantly, is the fact that this area is on the discharge side of the water pump - consequently it is at the highest pressure. That is the reason that the inlet to the heater core is supplied from the inlet manifold.
That hose (from the intake manifold) should always be connected to the bottom of the heater core. As the coolant flows into the core it fills it from the bottom to the top (where the outlet hose is connected). This ensures that the tubes within the heater core are always full of water and any entrained air (that would impede heat transfer) is vented out along with the coolant that is headed back to the engine.
That is why, if you have the option, it is always best to connect the return from the heater core to the radiator tank.
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Thanks for the info. Mine does not have A/C. For some reason I thought the Heater Core would be treated just like the Radiator, Have hot fluid travel from the Top to the Bottom of the Heater Core. That way if it wasn't totally 100% full it would not just blow bubbles.
I have getting all kinds of mixed reviews on this matter totally opposite of each other. I was handed a box with a new Heater Core and Blower Motor in it when I purchased my 1970 GMC C-20 as it was not hooked up when I purchased it. I came to this site to see the proper way to install it.
I new the pressure side is on the Intake Manifold and the suction side came from the Water Pump but what one should be on the Top is the dilemma. Here is a couple of pictures I found on this site.