radiator heater hose question

[MagmaJct]

Originally Posted by davepl

Given my factory Harrison rad doesn't have such a port, don't know what to tell you. Maybe it's because I have AC.

I still think it's a terribly slow way to warm up an engine, as it bypasses the thermostat. I don't get the design at all.

It makes sense if you think about it. The coolant leaving the heater core is passed over the ATF heat exchanger to pre-heat the ATF. Very little cooling occurs, as the coolant leaving the heater core is returned to the same side of the radiator that leaves the radiator. That is, the coolant leaving the heater core does not pass through the radiator core, so it receives very little cooling.

Regards,
Mike