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Thread: Heat coming from footwell

  1. #1
    Join Date
    Aug 2014
    Location
    Maracay, Aragua,Venezuela
    Posts
    3
    My Cars
    1992 BMW 325is

    Heat coming from footwell

    I've asked this before but haven't found an answer to it. I live in south Florida and in here the weather gets hot as hell.

    I've set my temperature to the coldest, and when I've just started the car, everything is ok. But when it gets warmed up the AC starts to blow heat through the defroster and footwell vents.

    Along with that, I get these codes:
    9C54 AUC sensor
    9C55 Fogging sensor

    I'm able to erase them, but later on they'll come back.

    Any clue to how I can solve this?

    Sent from my Nexus 6 using Tapatalk

  2. #2
    Join Date
    Feb 2010
    Location
    Atlantic Beach, Fl
    Posts
    502
    My Cars
    81,e21 orig ownr&05,e60
    The fogging/condensation sensor is bad, sending a bad signal to the IHKA module. The hvac is being instructed to defrost the windshield. The sensor is mounted on the windshield, forward of the rear view mirror.

    Bad AUC sensor. AUC is mounted on the passenger side of the radiator. The AUC senses hydrocarbons in the outside air and sends a signal to the IHKA module, which closes the recirculation flap, preventing hydrocarbons from entering the cabins air.

    Find both sensors under heating and cooling in REALOEM.com obtain the part numbers and order online from someone like, fcpeuro.com

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