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Senior Member
Simplified A/C concept?
As I’m starting to peck away at my build again, the A/C question is bouncing around in my head again as I mentally spool up. Any feedback for cutting the heat exchangers out of the air handling sub frame in the WRX, and placing them side by side with a fan mounted on each one to blow through into a plenum for mixing and distribution to vents (aka, sheet metal box)? Rather than one fan control followed by a slider, two fan controls, one for hot, one for cold. Achieve a desired mix by varying each fan speed. I imagine using the factory setup for air so the background stuff (compressor control, radiator fan control) is already integrated, but make a new circuit for heat (matching control switch, resistor module, fan). I’d want the fan control switches to match, so may have to sort through either a new switch to run the oem A/C, or looking at the factory switch to see if it’s a traditional setup to control the heat with a second sourced matching fan switch. Perhaps a gravity assisted rubber flap (like a dryer exhaust) at each heat exchanger’s output to prevent backflow if only one fan is running. And for any married guys, perhaps mount the heat on the passenger side, A/C on the driver’s side, and install a butterfly valve to split the plenum to give her heat and you A/C, lol. It’ll be a bit before I act on anything here, but figured if we start the conversation now, more heads involved would either help sort out or simply point out the problems with the idea. I envisioned something like an add-on heat unit for a UTV, just with 2 parallel blowers and a baffle or two to encourage mixing. Without digging out the WRX blower unit, I assumed 2 new blower fans.
It still requires having longer A/C hoses to be made, but allows for much of the factory stuff to be used like compressor, condenser, always open heat exchanger, etc.
Rich
818S in progress. 2007 WRX sedan donor.
Powered up: 7-8-14, First Start: 7-20-14, Go kart: 8-19-14
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