So its starting to get cold here in OH and with the new S4, I have noticed the heat does not work, my first thought was clogged heater core (which is getting flushed, as well as the whole cooling system this weekend since it does not have G12 in it) but even with the car up to operating temp, and no matter what the climate control unit temp is set to, it blows out ice cold, and the A/C compressor is engaged (can hear it running when you turn the climate control unit from off to any setting other then "econ", can feel the loss of power and condensation builds up on the AC lines) if I push the econ button, the compressor shuts off, but it blows out about 65 degrees not hot, but not cold and again the temp it is set too does not seem to have any effect.

Any ideas on what could be causing the compressor to always be running??

Thanks!