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Discussion Starter #1
Sorry, but I’ve been searching for two days now.

Does the heater core inlet come from water pump or passenger side block?

99’ 7.3 CCLB

Thanks


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I'm not sure. Previous response removed.

I went out and looked. Now I'm sure. I did have it correct the first time.

The cyl head fitting is the outlet TO the heater.
The water pump fitting is the return FROM the heater.
 

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It could be either way. Hot water from the block will work. Maybe it comes from the pump and the pump keeps the water circulating through the heater core. Maybe a shop manual will have a diagram. It has circulate or the blower will cool it down.
 
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