P8210018

So what if you totally block the restrictor plate or use a water pump with no recirculation port? This photo illustrates how the hot water side of the restrictor plate also exits the cabin heater connection. This is the hot side of the cabin heater, an even with the thermostat closed, you will get -some- recirculation without stagnating your coolant flow. Note, that if you have valves on your heater lines, like many in the Pantera world do, in this scenario you won't get any recirculation.