My 92 RS's climate control is stuck on the vent setting. Moving the selector doesnt do a thing. When the A/C button is pushed, the light comes on. The compressor doesnt engage when set on Max or Defrost. The engine cooling fan doesnt appear to be working either. I removed the control unit, looked it over, and didnt see any unconnected wires or breaks. My thoughts are centered around a relay. Any ideas?