Hello , I drive a PUG 406 SV 2.0 16V , RFV Bj. 1996 Recently my ventilation sporadically spins , that is when I start the engine and make the air conditioning or normal ventilation , the fan from the heating / air conditioning does not run with . I can also press on the AC operating unit what I want , the fan stays off . Only when I turn the engine off again and then on the ventilation goes . What can this be ? MfG Patrick