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What's the direction of flow through heater core?

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Old 08-05-2008, 10:22 PM
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What's the direction of flow through heater core?

From the firewall side, which one is the inlet and which is the outlet back to the water pump, or does it even matter? I can't remember which one is which. My concern is that there might be some sort of check valve in it to prevent backward flow through the heater core and I wouldn't know it until I needed heat. In my haste and disgust when removing the 7.3, I forgot to mark the hoses. Can anyone help?
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Old 08-05-2008, 10:31 PM
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The upper hose on the firewall goes to the water pump,that's got to be the inflow.
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Old 08-05-2008, 10:35 PM
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Supply is on the right, return on the left looking from front of truck. No cv's that I'm aware of , and I've 'messed' with my heater hoses quite a bit!

Following your progress, btw. Keep up the good work!

You rock!
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Old 08-05-2008, 10:39 PM
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The hose to waterpump is return. But that ain't gonna help - he does not have an engine in there... , or if he does it has 2 less cylinders!

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Old 08-05-2008, 10:55 PM
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The hose to waterpump is return.
You are correct, that is the return.
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Old 08-05-2008, 11:07 PM
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Quote:
Originally Posted by clux View Post
The upper hose on the firewall goes to the water pump
My hoses are side by side. I was thinking there is some variation in this between trucks.

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Originally Posted by SkySkiJason View Post
Supply is on the right, return on the left looking from front of truck.
That's perfect! That will work out well since the supply on the Cummins is further toward the middle. Thank you for the info. Check another item off the list!
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