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Temperature gauge going up and down like a yo yo

Discussion in 'Classic Audi Forum' started by Vince70, Dec 10, 2012.

  1. Vince70
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    Vince70 New Member

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    I wonder if someone can help,
    I have an audi 80 2.3 and the other week I put my heater on and noticed the water dropped in the expansion tank by about a litre so I refilled it with anti freeze and all was well.
    Today I warmed the car up and all was well then when I put my heater on my temperature when back down to 0%.
    I was thinking maybe an airlock or maybe a new thermostat, I put my heater on full hot and undid the bleed screw on the pipe which goes into the heater matrix but nothing came out.
    Also I notice when I undo the expansion tank the level goes up a touch but don't know if this is related.
    Any ideas would be much appreciated.
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