I use two ceramic heater elements mounted side-by-side in place of the original heater core. I think I paid around $20 each for the ceramic heaters at Lowes, and removed the elements. Been working fine for 4 years. Power to them is controlled with a P&B relay (pack is only 115V nominal), with the coil side connected through the blower switch and a separate "heater" switch so the heater cannot run without the blower switch on. You might also want to include a switch in that interlock chain that is turned on by the "cold"/"hot" selector lever so you don't inadvertently run the heater with airflow diverted away from it directly into the cabin. Fairly unlikely in winter, but you might divert it on a warmer day then forget to switch it back. It would also be nice to use a couple relays or contactors so you can power only half of each element or all, for two heater powers. I did not - I just turn it off when warm, back on when I feel cold. The mounting material for the heaters must withstand the high temperatures the heater attains. I used Teflon, with working temp of 500F. I did some bench tests with/without a fan on a heater element. Polycarbonate melted, Teflon did not. The MES-DEA heater is nice, but pricey.
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