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V8 injection water plumbing


mikec
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Hi guys, not sure if to put this in the defender forum or here, but I'm going to plumb in the heater on my 90 using a v8 Hotwire injection manifold from a disco. So far I've got the outlet next to the thermostat housing going to one heater pipe, question is where do I send the second heater hose too, is it the top or bottom rad hose? I'm guessing bottom but I could be miles off :)

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No idea on the parts, but bottom sounds good. As I thought the heater hot pipe connected in just after the head, engine-side of the thermostat and then the other side of the water pump. Then the first bit of any hot water went into the cab? (same for all engines)

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"Thinking about it a little more, does it need to go back into the top hose? Otherwise that water isn't being cooled by the main rad?"

It is more like; The water resistance of the rad is what pushes water around the heater when the thermostat is open.

I've never seen it montioned as a fact, but I guess the heater flow drops as the thermostat opens?

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