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Old 01-11-2015, 12:00 AM   #1
mater69
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yes....another heater core question...

I've been searching, and have not seen what I need. I'm replacing my heater core and forgot which coolant inlet/outlet goes on top-the big tube. or the little? It's for my 69 c-10 cab. Also does anyone have a flow diagram? I was wondering if the heater core is fed from the top to the bottom, or bottom to top?
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Old 01-11-2015, 12:08 AM   #2
scotts72heavyhalf
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Re: yes....another heater core question...

Bigger one goes on the bottom, little one on top.
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Old 01-11-2015, 12:19 AM   #3
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Re: yes....another heater core question...

great, thanks! does the core get fed from the bottom, or in the top?
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Old 01-11-2015, 12:52 AM   #4
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Re: yes....another heater core question...

Pretty sure it comes in the top and exits the bottom. Just like a radiator.
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Old 01-11-2015, 12:57 AM   #5
michael bustamante
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Re: yes....another heater core question...

Jeez im glad i ran across this. I just refurbished my heater assy and looked to see my core is upsidedown!!!
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Old 01-11-2015, 01:08 AM   #6
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Re: yes....another heater core question...

It looks like I was wrong. I have it backwards. Here is a pic from my sons truck. Looks like the bigger one is on top in this pic
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Old 01-11-2015, 01:09 AM   #7
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Re: yes....another heater core question...

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Old 01-11-2015, 02:33 AM   #8
Stocker
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Re: yes....another heater core question...

Hot water enters the heater core at the bottom, through the smaller nipple.

Water exits the heater core through at the top, through the larger nipple.
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Old 01-11-2015, 10:12 AM   #9
Andy4639
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Cool Re: yes....another heater core question...

Correct bottom is feed top is exit.
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Old 01-11-2015, 11:17 AM   #10
michael bustamante
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Re: yes....another heater core question...

Ok got it. I was correct the first time. Thanks and im sorry for hi jacking!
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Old 01-11-2015, 04:15 PM   #11
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Re: yes....another heater core question...

Here is a thread from when I did mine, may help someone in the future.

http://67-72chevytrucks.com/vboard/s...d.php?t=600448
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Old 01-11-2015, 04:19 PM   #12
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Re: yes....another heater core question...

Quote:
Originally Posted by Stocker View Post
Hot water enters the heater core at the bottom, through the smaller nipple.

Water exits the heater core through at the top, through the larger nipple.

Correct, large tube on top.
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Old 01-11-2015, 09:19 PM   #13
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Talking Re: yes....another heater core question...

thanks guys!! I'm gonna have heat tomorrow!!!

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