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Temp reading

Discussion in 'A3/S3 Forum (8L Chassis)' started by 1animal1, Jan 26, 2009.

  1. 1animal1
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    1animal1 The Clar!! it mouves!!! VCDS Map User

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    [Jan 26, 2009]
    Hola!! just playing around on the way to work this morning and decided to check the inlet temps.... i think this is option 49 on the aircon unit....

    anyway, sat mostly at 78 C but went down to 69 C whilst coasting down a long hill, is this normal? my temp gauge also went to about 80 C whilst this was happening...whats the diagnosis chaps?:racer::sadlike:
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  3. Imteyaz
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    Imteyaz 6th Gear

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    [Jan 26, 2009]
    I could be wrong here (somebody please correct me if I am) but using '49' function on the aircon screen tells you the temperature of the coolant that the ECU will see, not inlet temperature.

    I had the same issue, temp would drop on long journey but steadily rise when stuck in traffic. I changed the thermostat (and dipstick tube as it shattered whilst trying to access the thermostat) and checked again to see that the temp stayed at 90degC once warm.

    Thermostat from a stealer is about £12, dipstick tube about £3 and the grazed knuckles you get from doing the job are free!
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  4. Westy
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    Westy Double Dark Side! Diesel & 8P

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    [Jan 26, 2009]
    yeah if your temp guage on the dash is showing the same as your aircon reading then you'll need a new thermostat.
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  5. FazS3
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    FazS3 Member

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    [Jan 26, 2009]
    Thermostat fella
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  6. Prawn
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    Prawn My other car is a MINI!!!!

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    [Jan 26, 2009]
    it's a very typical VAG problem, that the thermostat starts to stick open. it's not doing any massive harm, although it'll take longer to warm up, and won't usually reach 90 on a run. it'll also probably get progressively worse.

    My car runs fine at 90 in summer, but in the cooler winter months, it rarely gets above 70 degrees, which is bloody annoying!

    New stat will cure it
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  7. HTC
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    HTC Active Member

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    [Jan 26, 2009]
    Theory-o-etic-cally-ish (spelling :)) an engine not running at it's designed temperature might cause raised engine wear.

    I concur, it's a thermostati-cally-isk problem.
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  8. 1animal1
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    1animal1 The Clar!! it mouves!!! VCDS Map User

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    [Jan 26, 2009]
    cheers guys, i thought as much but wanted clarification..... the temp display isnt showing the same as the aircon yet but assume its best to change

    will do a search for the guides to replace......
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  9. V.I.P_UAE
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    V.I.P_UAE Member

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    [Jan 26, 2009]
    Yeah as everyone explained, its the thermostat, mine was the same last week, I was on the motorway and it went all the right down to register nearly nothing. Changed the thermostat this week and it is now a rock solid 90deg always once up to operating temperature.
    #8

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