Hi, I have a '88 124 series 260E Merc and having problems it seems with electrics, for starters the aircon will switch on then off after about 5 min then not come on again, the heater switches control wrong sides ie: the left wheel heats the right and visa versa and the recirculation air switch also goes on and then switches off in about 5 min, its all very weird, I thought it might be the chip board behind the control panel where the heater wheels are attached? Any help will be appreciated