Thread: 4 Way Heater Valve - Anyone have a flow diagram?

If you have an Isuzu you can just block flow to the heater core. No need to flow coolant around the heater ports on the thermostat housing. You can just use a single standard inline heater tap then. Does that make sense and help you?

Edit: what I mean is just put a t-piece in the existing lines and see if you get enough flow. Only issue might be the coolant will mostly take the path of least resistance which maybe the turbo. If the turbo is a small hose I reckon you might be ok.

They are usually marked with arrows for preferred flow direction. Then you can operate the valve with your finger and blow through it to check. Generally the heater connects to the 2 ports on one side, everything else on the other.

Judo, unfortunately I'm not sure what you mean. As I understand it, I need coolant to physically flow through the pipes to cool the turbo and lose heat in the heater core, so I need to have positive flow at all times. As the turbo and heater matrix will be on the same line, wouldn't turning the flow "off" at the heater matrix effectively also stop the flow to the turbo?

I thought a 4 way valve would allow the system to be set up in two ways. In the "off" position, coolant flows from the pump/thermostat housing, into the turbo, out of the turbo, into the valve, straight out of the valve and back to the pump/thermostat housing.

In the "on" position, coolant flows from the pump/thermostat housing, into the turbo, out of the turbo, into the valve, into the heater matrix, out of the heater matrix, out of the valve and back to the pump/thermostat housing.

I just want to make sure this is correct before I order a valve. I will try to match the various pipes so everything is the same diameter.

OK, so you want to run the turbo and heater in serial / inline. The coolant flows through the turbo and then through the heater. I couldn't say with 100% certainty that's how the "4 way" tap works. I only count 3 way being necessary.. ??? Why is there 4 connections? If it is 2x2 routes, then I'm not sure that it will actually help you.

bee_utey?

Edit: to summarise - does anyone have a flow diagram?

Originally Posted by Judo

OK, so you want to run the turbo and heater in serial / inline. The coolant flows through the turbo and then through the heater. I couldn't say with 100% certainty that's how the "4 way" tap works. I only count 3 way being necessary.. ??? Why is there 4 connections? If it is 2x2 routes, then I'm not sure that it will actually help you.

bee_utey?

A 4 port valve is functionally equivalent to a 3 port valve and a separate tee piece in the return line (or two nipples on the suction side of the water pump). Take your pick, either way works just fine . 3 port valves used to be found on some Holden V8's of the 70's, 4 port ones are loads more common now.