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The heater core is stacked with the a/c evap.
When you are in a/c mode with temp turned to heat its no different than regular a/c running in heat mode.
"Heat" doesn't come out in this case because you don't turn on the fan so nothing comes out. Intercooler temps are still a lot cooler than engine coolant, and all you are doing is cooling the heater core with the evap.
As far as I know it works without a hitch, they ony drawback if any, is you no longer have a heater.
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