I blocked it all off and everything has worked just fine for the last 5 years. Heats up and cools down when the thermostat opens and closes. I have a mechanical auto meter temp gauge and it shows the action really clear.
just thought it out and with a stock heater core and valve, the valve would be closed off and stopping flow and the factory temp sender would be in that location so the guys at toyota thought it would be ok.
Pulled everything out of my 4Runner when I went buggy, (including rear heat). Bolts with hose clamps reside in shortened heater hose. I moved the thermostat housing to a custom mount in the upper radiator hose with a mechanical gauge and an electric Taurus fan set up. Has worked fine to date.
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