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I do not know anything about the 900 series cars so I will get that out of the way as a minor disclaimer. I drive 240’s and my question is. Are 940’s heater cores really that much easier to do that you knowingly bought the car anyway?
In thinking about your question, I will suggest that you hook up the heater core like the radiator on the front of the car. They work the same as they both lose heat.
They use a radiator system to work with natural thermal convection. Hot air and water rise. That said, as hot water cools it sinks to the bottom because it become more dense or heavier. The pump works less because it is going with the flow. The system will continue to flow when the pump is not running. If you notice, the bottom radiator hose connects to the suction side of the water pump and the pump uses a turbine design.
The thermostat (a valve) is on the outlet side of the pump and goes to the top of the radiator. The direction of flow is important because is suppose to sense the hottest heat flow right out of the engine cooling passages.
As a regular valve, that does not need that requirement; it will not make any difference which line it is connected. They can design that valve to fit anywhere, even though it seems they to like putting them in hard to reach places.
A shut off valve can be directional for a few reasons.
Most valves designs want the flow to come up to and under the seal, not on top of it. There is less chance to for a seal to stick downwards and requires less effort to open a valve. There is less chance for any contaminates in the medium to rest around or collect on the seating surface during the lesser flows rate upon closing.
Pressure should be under a seat and not around a moving actuator side of the valve. This is because of packing seals. When a valve is off the static pressure is highest, you want that on the most solid portion of the valve. I consider an inlet to be opposite the serviceable or assembling side.
I leave it with; go with nature and what feels natural.
Phil
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