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  1. #1
    Veteran Member Three Rings b5a4erik's Avatar
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    Unknown Connector ~ Help Please

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    I've searched.

    From the right side of the engine bay, a long wire,

    813 971 956
    to
    357 919 754

    where does it connect to?

    Regards,

    ~ ea
    1999 A4 FWD AEB 1.8T ~ Atlas

  2. #2
    Veteran Member Four Rings Believer's Avatar
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    Oct 24 2011
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    New Jersey

    Pretty sure it's for the connector on the AC condenser

  3. #3
    Veteran Member Three Rings b5a4erik's Avatar
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    Quote Originally Posted by Believer View Post
    Pretty sure it's for the connector on the AC condenser
    Thanks for the response Believer, but isnt the purp/green one for the compressor?



    EDIT:

    Or you're talking about the radiator looking like thing?
    1999 A4 FWD AEB 1.8T ~ Atlas

  4. #4
    Veteran Member Four Rings Believer's Avatar
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    That is the compressor not the condenser. The condenser is the radiator like unit that sits in front of the cooling system radiator.

    Sent from my LG-H815 using Tapatalk

  5. #5
    Veteran Member Three Rings b5a4erik's Avatar
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    Ah, word. Thanks for the clarification. You're probably correct.

    I believe.

    Thanks man.
    1999 A4 FWD AEB 1.8T ~ Atlas

  6. #6
    Veteran Member Four Rings Believer's Avatar
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    The harness is supposed to rout down along the inside bottom of the core support and come out of the hole in the core support on the passenger side and then connect to the condenser. If I'm right lol

    Sent from my LG-H815 using Tapatalk

  7. #7
    Established Member Two Rings Airrik's Avatar
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    Aug 14 2016
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    Germany

    Google says coolant temperature sensor.

  8. #8
    Veteran Member Three Rings b5a4erik's Avatar
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    Quote Originally Posted by Believer View Post
    The harness is supposed to rout down along the inside bottom of the core support and come out of the hole in the core support on the passenger side and then connect to the condenser. If I'm right lol

    Sent from my LG-H815 using Tapatalk
    I actually removed my whole AC system a while back. I'm hoping I just forgot to remove this connection haha. I was worried about the length (quite long), but the way you describes it seems to make sense.

    Quote Originally Posted by Airrik View Post
    Google says coolant temperature sensor.
    Word. I think they are the same plastic connection piece, used several places, with varying wires going through them. My CTS in in place Thank you though.
    1999 A4 FWD AEB 1.8T ~ Atlas

  9. #9
    Veteran Member Three Rings b5a4erik's Avatar
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    Wait, are there 2 coolant sensors?
    1999 A4 FWD AEB 1.8T ~ Atlas

  10. #10
    Veteran Member Four Rings Believer's Avatar
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    There are two temp sensors. 1 at the back of the head in the flange and the other will either be a 3 pin in the radiator on the drivers side or a 2 pin? In the lower rad hose. Neither of the latter use this connector

    Sent from my LG-H815 using Tapatalk

  11. #11
    Veteran Member Three Rings b5a4erik's Avatar
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    Interesting. I've replaced my top CTS several times. My coolant temp barely gets to above halfway to stay there, almost always a 1/4 on the gauge. Could this secondary sensor have anything to do with that?

    But word. The secondary sensor is atleast plugged in.
    1999 A4 FWD AEB 1.8T ~ Atlas

  12. #12
    Veteran Member Four Rings Believer's Avatar
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    Yea the secondary sensor is only for auxiliary fan activation as far as I know

    If your temp is not getting up and you've replaced your primary CTS your thermostat is the likely culprit

    Sent from my LG-H815 using Tapatalk

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