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Coolant Temperature Guage

Discussion in 'A4/S4 forum(B5 Chassis)' started by filipharvey, May 22, 2008.

  1. filipharvey
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    filipharvey Amusing Tagline

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    [May 22, 2008]
    I posted this in the A6 lounge, but as a lot of you A4 owners have the 1.8T engine, I guess it would be applicable in here too.

    Basically my guage is reading high at speed and normal at lower speeds.
    Any ideas?
    #1
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  3. olds_kool
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    olds_kool Active Member VCDS Map User

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    [May 22, 2008]
    is it moving smoothly or eratically, eratically would suggest temp sender, by normal do you mean needle is pointing straight up 90 deg c ish
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  4. filipharvey
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    filipharvey Amusing Tagline

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    [May 22, 2008]
    Yeh, normal being 90. It then goes up to 110 within about 10 seconds and doesn't generally (although I've only driven about 60 miles) go back down to 90 until I slow down.
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  5. AndyMac
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    AndyMac Moderator Staff Member Moderator

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    [May 22, 2008]
    Usually a knackered temp sender will under read or fail to read anything at all and often cause erratic idle & stalling. Sounds more like thermostat is stuck closed, but try the temp sender first as it's only £20 and a 30minute DIY job
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  6. olds_kool
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    olds_kool Active Member VCDS Map User

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    [May 23, 2008]
    id go with the thermostat first then, i had opposite problem with old car wouldnt reach normal temp so thermostat stuck open? only cost £7 for thermostat but £20 for correct red coolant.
    fairly easy diy expect wet arm though and note which way round it goes, did mine on my new car when i bought it as i was flushing coolant anyway and it seems a common failure part so didnt want it to fail a few months after flushing system
    i replaced sender first and made no difference so put old one back and added new one to my spare part collection, sender is at rear of engine 9opposite side to belts) if you want to change it.
    andymac how did it take you 30 mins? 3 coffee breaks?
    #5
  7. low610
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    low610 Member

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    [May 23, 2008]
    I'd go for the temp sensor, about £20 from Audi and as said, you can fit this yourself.

    Just make sure the engine has cooled down, i made this mistake when changing mine. :)
    #6
  8. AwesomeSarah
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    AwesomeSarah Member

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    [May 23, 2008]
    Maybe even worth thinking about water pump
    Part of the water pump breaks off
    At normal steady speeds it is OK
    Motorway driving the rest of the impella cannot keep up
    So temp goes up
    Has it been replaced before?
    Sorry
    Sarah
    #7
  9. Markey
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    Markey Active Member

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    [May 23, 2008]
    Sounds like an idea.
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  10. Blue_Thunder
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    Blue_Thunder Active Member

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    [May 23, 2008]
    I 2nd that Sarah, defo sounds like water pump to me.
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  11. olds_kool
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    olds_kool Active Member VCDS Map User

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    [May 23, 2008]
    makes sense!. you can get ones with metal impellars to prevent it happening again
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  12. Markey
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    Markey Active Member

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    [May 23, 2008]
    When i replaced my plastic one it had bits missing all over.
    #11
  13. AwesomeSarah
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    AwesomeSarah Member

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    [May 23, 2008]
    Sorry , it is more expensive than temp sensor too :(
    Sarah
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  14. AndyMac
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    AndyMac Moderator Staff Member Moderator

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    [May 23, 2008]
    Slightly, £20 vs £400 (as you'll need to do cambelt/tensioners etc at the same time)
    #13

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