Most modern dash temp sensors are biased to give a stable reading around the middle of the gauge rather than an actual temp reading.
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The VAG temp gauge for the 1.8T shows the same reading
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(middle) on the gauge between something like 70 and 100 degrees, they show cold below and hot above.
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I guess it's been decided that most drivers would be offended
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/ distracted
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/ worried by needles moving around on the dash!
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The MR2 sensor
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/ gauge is unbiased so moves in relation to the actual temperature of the coolant.
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Check that your coolant system is fully bled of air bubbles.
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Air in the system can cause unstable or inaccurate readings.
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