Doesn't Thor do aftermarket ducting on those? Not sure of the setup, but I'd check all the things simidrm mentioned, then see if you can trace the ducting from the engine bay firewall side... probably not an easy task.
If you have cold refrigerant lines, use your infrared thermometer if possible to trace the cold air flow to see where it stops. But like mentioned, I'm guessing it's a compressor issue.
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