Coolant Flow Direction - Pontiac GTO Forum
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post #1 of 4 (permalink) Old 01-06-2017, 09:26 PM Thread Starter
DTM
 
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Coolant Flow Direction

All,

Installing a Vintage Air system and need to install an inline value. Which connection is the "output" on a '70 455? The rear 5/8" one on the drivers side head or the 3/4" on the waterpump housing. I am thinking it si the one on the head... Can someone please confirm...

Thanks in advance,

DTM
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post #2 of 4 (permalink) Old 01-08-2017, 06:11 PM Thread Starter
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No one can answer this?
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post #3 of 4 (permalink) Old 01-08-2017, 06:46 PM
 
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The water pump pushes coolant out to the heater core and the radiator. The port at the rear of the head is the return from the heater core.
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post #4 of 4 (permalink) Old 01-09-2017, 07:25 PM
 
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Originally Posted by DTM View Post
No one can answer this?
Well, here is what I found doing an internet search:

Coolant flows into the water pump thru the bottom radiator hose, into the block from the water pump, up into the heads, and then to the intake crossover (or heater core from the back pass side head), then back to the radiator via the top hose. Coolant from the heater core is returned to the water pump not to the radiator.

And this:

Hot coolant flows out of the nipple from the rear passenger side head. The return is on the timing cover.

Last edited by PontiacJim; 01-09-2017 at 07:44 PM.
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  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, Lemans & GTO General Discussion

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