Which way does the coolant flow?

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69_340_GTS

69_340_GTS

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On a '69 Dart small block, which way does the coolant flow thru the heater core? Is it coming from the intake manifold and running back to the top of the water pump? That's what I suspect.
RTFM? I did, and it doesn't say anything about it.
 
Not for sure but I am thinking from the water pump to the heater core then back in the intake, The water pump pushes hot water to the top of the radiator so I am just thinking the water would be hotter leaving the pump.... just thinking out loud here.. a good tech will jump in soon I am sure.
 
Just as I suspected, the water pump sucks water in from the radiator and heater core. Thanks Rani!
 
Yep , Thank you Rani for straightening me out mam.
 
memike said:
Not for sure but I am thinking from the water pump to the heater core then back in the intake, The water pump pushes hot water to the top of the radiator so I am just thinking the water would be hotter leaving the pump.... just thinking out loud here.. a good tech will jump in soon I am sure.
Click to expand...

I guess the pump pushes cooler water into the block. So the hottest water is coming out of the block/heads,which is where the "in" heater hose is connected. I don't know what made me start thinking about this. But it all makes sense now. Thanks guys!
 
Centrifugal pumps push. They will not pull water very high, but they will push it up a well, pretty good.
If your heater core has different sizes of pipes, they are keyed likewise to the engine fittings. I think pre about 72, that was the case.If you hook em backwards, they can trap an air-bubble and it will be noisy for a long time, until the air bubble works itself out.
 
As suggested by the MP book, race only mod, take water out from the center port of the head where it is hottest. This is a PIA mod, but it works well, since the water comes "UP" from the block.

Good job Rani
 
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