paulmerc

hi all,please please can somebody help me,if i cant get advice in the next 24hrs im in a bad way for xmass,ive no heating in the car 2000 s320,thermo ok,valve pump,ok,water pump ok ive also replaced the heat control unit above the ash try ,,there is one fault reading,code 1269 its the "multi function sencor"what the hell is this and where is it,all the mechanics ive spoken to dont know,please can somebody tell me where it is and what it does,i need heating in the car over christmass,thank you to all