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| | | Forums66 Topics128,163 Posts1,056,921 Members48,458 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: May 2017 Posts: 100 'Bolter | | 'Bolter Joined: May 2017 Posts: 100 | It will work either way you hook up,no right or wrong way. Water in water out .I always try to put flow in be-hide the switch valve that lets antifreeze into the heater core.
This way keeps pressure out of the core assembly. heater cores are old or new but I don't like to add pressure if I can help it.
!956 Gmc Napco 4x4 Factory line built .
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