B1234 = Sun sensor (increases fan speed), most of us report that fault.
B1459 = Electromagnetic Clutch at compressor. May be siezed. Can be replaced. More diagnostics needed.

__________________
Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)