Another possible cure, since coolant to the heater core still runs from the back of the engine, would be to plug the existing heater core hard lines at the firewall, and run the heater coolant hoses to and from an auxiliary radiator. Would 9.1.3.D.3.a allow an auxiliary radiator to be added (as long as it's mounted parallel to the existing radiator)? Or maybe I could use the A/C condenser as an auxiliary radiator?
Or I could just turn the cabin heater on full-blast, but on the days where cooling becomes an issue, that's going to be fairly... unpleasant.
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