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Intermittent temp gauge.

Discussion in 'A4/S4 forum(B5 Chassis)' started by Iceash, Dec 20, 2013.

  1. Iceash

    Iceash Member

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    Hi all,

    had the stat changed as I was getting odd temp readings. As it climbed it would fall suddenly, then climb higher then fall again. It would eventually get to 90 then maybe now n then drop to say 70, hold then climb back to 90. The 49c would mirror this also on climate con. Could this be the cts? Or something else?

    thanks,

    Ash
     
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  3. myth

    myth Member

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    Definitely the CTS. If you have a vag com, surely it will throw a code.
     
  4. Iceash

    Iceash Member

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    Don't have access to vag com. Can't be anything else then?

    Is it something Audi keep on the shelf?
     
  5. Bradderz_1988

    Bradderz_1988 Dont replace it, Upgrade it !!

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    Mine did this a while back when i fitted a new temp sensor and thermostat !! I would be driving on motorway and it would drop to 70' then slowly creep back to 90' left it alone to see how it got on and its never done it since !! Both were genuine audi parts !!
     
  6. Iceash

    Iceash Member

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    Been doing it for weeks now, new stat fitted today. Fitted the higher temp one though. Engine and oil nice n toasty.
     
  7. B5 BIKER

    B5 BIKER Member

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    Definitely the cts mate
     
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  8. Iceash

    Iceash Member

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    Audi likely to carry one on the shelf?
     
  9. B5 BIKER

    B5 BIKER Member

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    Ya they get changed that often they normally would
    2 different versions though. 2 pin or 4 pin
     
  10. Iceash

    Iceash Member

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    Has 4 wires coming out of it so assume 4 pin. So other than feeding temp to dash gauge. What's its purpose?
     
  11. desertstorm

    desertstorm Moderator
    Staff Member Moderator VCDS Map User quattro Audi A4 Audi Avant Owner Group TDi

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  12. Iceash

    Iceash Member

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    Funnily enough, I went through 3 in 5 years on my 6n polo!
     
  13. Bradderz_1988

    Bradderz_1988 Dont replace it, Upgrade it !!

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    That one is the newer style 'D' shaped two pin sensor you need the old square style 4 pin one thats green they are what audi supplys and have superseded from the old blue square 4 pin sensor !!

    But double check as some late TQS's have the 'D' shaped green one !!
     
  14. desertstorm

    desertstorm Moderator
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    They have 4 wires because there are two seperate temperature sensors in there. One supplies the ECU the other the dash for the temperature reading. One or both can be intermittent. Quite often you only notice because the temperature gauge starts going like a windscreen wiper.
     
  15. Iceash

    Iceash Member

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    I had a D shaped one, changed surprise surprise. All works lol :-D
     
  16. B5 BIKER

    B5 BIKER Member

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    Good stuff, I had to change mine on my old A4, even my A6 now needed one also so it must be fairly common.
    Both sides were shot, needle used to jump around and the ecu sensor also it used to make the engine run uneven and bring on the esp light
     
  17. Iceash

    Iceash Member

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    Thankfully she behaved other than using a little more fuel. However when the one on the Polo failed it kept reving which was scary when trying to engine brake lol
     

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