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Old 09-16-2013, 02:00 PM   #1
johnnyclack
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Heater core Hoses go where? <> top/bottom

Heater core Hoses go where? <> top/bottom

I pulled the heater core on my 79’ K-30 w/AC some time back. Now that I did not take any Pick’s which hose goes where..........


Thanks’ Fellows
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Old 09-16-2013, 04:03 PM   #2
dieseldawg142
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Re: Heater core Hoses go where? <> top/bottom

top hose goes to rad. or water pump, bottom hose goes to intake
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Old 09-16-2013, 05:21 PM   #3
INSIDIOUS '86
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Re: Heater core Hoses go where? <> top/bottom

You want it to flow up so it will blow out any air bubbles
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Old 09-16-2013, 06:10 PM   #4
raceman6135
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Re: Heater core Hoses go where? <> top/bottom

Another way to tell is that the inlet and outlet are different sizes: one is 5/8" and the other is 3/4". Match the heater core to the corresponding size nipples on engine/water pump/radiator and you're set.
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Old 09-17-2013, 06:36 AM   #5
johnnyclack
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Re: Heater core Hoses go where? <> top/bottom

Quote:
Originally Posted by INSIDIOUS '86 View Post
You want it to flow up so it will blow out any air bubbles
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Good tip; Thanks I was not aware of this fact
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Old 09-17-2013, 06:40 AM   #6
johnnyclack
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Re: Heater core Hoses go where? <> top/bottom

Quote:
Originally Posted by raceman6135 View Post
Another way to tell is that the inlet and outlet are different sizes: one is 5/8" and the other is 3/4". Match the heater core to the corresponding size nipples on engine/water pump/radiator and you're set.

If only life would remain this simple


The P/O has upgraded both hose’s & fittings to match ¾” .
Not sure the gain here, if any ?
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