Hi, hope it can help me. with the Ka from my wife the heating blower only goes, if the rotary regulator is turned to 4 and then also with the full speed.On 1,2,3 does nothing. Does someone, what could be defective here and where and how I get to the defect part? It is very annoying to run the blower on full steam. The Ka also has climate. For tips I am really grateful. Bj 97.-1,3Lit. rob1