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Coolant temperature gauge

Discussion in 'A4/A4 cabriolet/S4 forum(B6 chassis)' started by Eric_funk, Jun 30, 2012.

  1. Eric_funk
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    Eric_funk New Member

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    [Jun 30, 2012]
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    [TD="class: alt1, bgcolor: #F5F7F9"]Hi all

    2002 B6 1.8t

    Hope someone can help, my coolant gauge is erratic, sometimes works and sometimes doesn't, always goes to 90 degrees when working though, I've replaced the coolant temp sensor with a genuine Audi one, and the heater works ok.

    I'm noticing that the radiator fans come on from a cold start in the morning and it has on occasion cranked a while before starting, could it be the thermostat?

    Thanks for any help given, am loving the car and just a few things to sort out (front pads, front and rear subframe bushes)

    Cheers

    Derek
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    #1
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  3. Andi25th
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    Andi25th Member

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    [Jun 30, 2012]
    If the fans are on it could be because your aircon is on. If its not on then possibly a faulty fan switch.
    #2
  4. marktdisport
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    marktdisport Active Member

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    [Jun 30, 2012]
    id say its your temp sensor m8 easy and cheap fix....
    #3
  5. bowen
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    bowen Member

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    [Jun 30, 2012]
    if your fans are on in the morning when its cold etc it could be a fan switch. I have a fault temp gauge, the actual gauge can be at fault.
    #4
  6. Eric_funk
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    Eric_funk New Member

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    [Jun 30, 2012]
    Cheers guys, good tips, I'll pick up a fan switch and yeah Bowen I suppose it could be the gauge, I'll check that out too, thanks again
    #5
  7. bowen
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    bowen Member

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    [Jul 1, 2012]
    i know mine is the gauge ia vagcom, however it was pretty obvious it was the gauge as it would sit at 90 with the engine off and other odd signs.

    Replace the temp sensor with a OEM part no cheap ebay ****. I actually think i have a spare OEM one, let me know if you want it.

    With the fans going, on and off at cold start I would imagine that the fan switch has had it. £440 iirc at the dealer?
    #6
  8. Mike B
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    Mike B Member

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    [Jul 1, 2012]
    Wont be the stat if the heaters OK and I would expect a switch to fail in the off position.Why not disconnect the switch and see if the fan stops?Seems like a faulty guage to me
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  9. Eric_funk
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    Eric_funk New Member

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    [Jul 1, 2012]
    Thanks guys, if you mean the coolant temp sensor Bowen then I've replaced it with a genuine one, so I had the car scanned today using vag-com and it's throwing up 17704 - error in mapped cooling system, check temp sensor and thermostat

    P1296 - 008 - implausible signal

    Any ideas what this might be?

    Ill also try the fan switch thing Mike B, thanks
    #8
  10. bowen
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    bowen Member

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    [Jul 1, 2012]
    the heaters are hot and stay hot? even stationary in traffic?
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  11. Eric_funk
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    Eric_funk New Member

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    [Jul 1, 2012]
    Good point, ill do a full test tomorrow to find out, I forgot to mention that the engine managment light is on also, I'll keep this updated

    Thanks Bowen
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  12. Eric_funk
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    Eric_funk New Member

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    [Jul 2, 2012]
    Heater is fine and hot even in stationary traffic, is it not the thermostat then?

    Cheers guys
    #11
  13. Eric_funk
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    Eric_funk New Member

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    [Jul 2, 2012]
    Just an update, i read the codes again today with the engine on and the fan was running (from cold) and then cleared them, once i cleared the codes (DTC's) the fan stopped running (it will switch off anyway after a while) hmmm

    Also got this code from Vag-com today, could this mean my gauge is faulty?

    01317 - Control Module in Instrument Cluster (J285)
    49-10 - No Communications - Intermittent

    Cheers
    #12

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