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How to check Coolant Temp on Air Con Display?

Discussion in 'A4/S4 forum(B5 Chassis)' started by madkebab, Oct 15, 2011.

  1. madkebab

    madkebab Member

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    I remember reading this can be done but cannot find through searching the exact procedure. Can anyone help as I am pretty sure my thermostat is duff.
     
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  3. AndyMac

    AndyMac Moderator
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    Hold in recirc and up arrow and the display will change to 0c then use the + to dial up to 49c and it will then display the coolant temp. However if the temp sender is at fault which is usually the problem, then this trick will show the same temp as the temp guage as they get the feed from the same sender.
    What are the symptoms?
    If running permanently cold with bad starting and stalling then it will be the temp sender - easy DIY fix, but buy a replacement from dealer (£10), don't buy an ebay cheapy.
    If the car runs OK but is cold on motorway, but reaches 90 when idling in the drive for 10mins then sounds like the thermostat is stuck open.
    If it's overheating then its stuck closed
     
    #2 AndyMac, Oct 15, 2011
    Last edited: Oct 15, 2011
  4. madkebab

    madkebab Member

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    Cheers Andy. Your description confirms my thought that the thermostat is stuck open. Looking in the service history the car only had a thermostat about 12 months ago. Is it worth getting a genuine thermostat from the dealer? Also how difficult a job is the thermostat to change?
     
  5. AndyMac

    AndyMac Moderator
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    I'd get one from a dealer or GSF as they are peanuts. Think it's a bit of a PITA to change, there is a guide on here somewhere.
     
  6. macpdm

    macpdm Member

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