Chrysler Repair: jeep lights flashing & smelly vent air, vent air, cab air

Question
High Kevin my jeep 04 grand Cherokee lights flash at night some times when the switch is on auto . You have addressed this before but I can't find it . So if it is the sencer ?where is located and what does it look like . I am not sure if does it during the day ? For now I just shut them off . Also you helped me before with the lock motor on the key clay of are 96 Town & Country mini van , we noticed that in are new used van that the vents smell stinky ( like body odor from the past owner )can we freshen them up ? Should I take the blower fan out and spray fabrease in there I assume it is under the front cowl since it is not in the engine compartment or maybe put the vent setting on recirculate and spay it where it intakes the cab air ( where would that be located ? ) what do suggest to change this old smelling van into a good smelling van
Thanks so much for your time.                             Thanks from Canada GREG

Answer
the sensor is on top of the dash  the little red thing on top. U remove the 2 side panels and then lift up on the top  2 screws hold the sensor to the dash.

the smell could be water staying inside  and getting mold or  have an evap leaking.  U can spray lysole in the intake of teh cowl outside  on the pass side  and that will help with the mold in there. Have the fan on low when doing this.