Strictly speaking, with the heater on, it acts as a miniature HX removing heat from the coolant. Meaning more energy is leaving the system than with the heater off. OK I get it.
But are we talking 1% cooling or 0.001%??
I might be ignorant, but having the heat on full blast seems more of a...
After 15 years my OEM radiator started leaking from the bottom of the radiator.
Instead of trying to fix it, I chose to pay the $370 (shipped) and order Koyo Radiator.
Looks lot better than the original...all SS is slick.
I haven't noticed anything on the performance/cooling as I have...