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Thread: Temp reading

  1. #1
    1animal1's Avatar
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    Temp reading

    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?
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  3. #2
    Imteyaz's Avatar
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    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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    Westy's Avatar
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    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. #4
    FazS3's Avatar
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    Thermostat fella
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    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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    HTC
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    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.

  8. #7
    1animal1's Avatar
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    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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    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.

 

 

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