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Heater blowing cold and temperature gauge reading too high

Discussion in 'A3/S3 Forum (8L Chassis)' started by TDIQ, Jul 1, 2011.

  1. TDIQ
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    TDIQ 8L > 8P > 8V

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    Today I noticed my car crept up to just over 90 to about 100 degrees. It's warm so I didn't think much of it.

    Later on I saw it had gone to 105, this is as high as it read, so I thought I'd try and put the heaters on to take some heat out. The thing is, they blow cold.

    I have run the engine with the coolant cap off and squeezed the pipes to remove a possible airlock, but there doesn't seem to be one. The engine was running, and the gauge was at 90, so I put my finger in the coolant tank and it was warm, but definitely not 90!

    Car hasn't been using any coolant at all, and runs really nicely with no smoke so I'm confident it's not a headgasket, so what could it be?
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  2. steve bain
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    steve bain Member

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    coolant temp sender is a quick and cheap place to start. car has aircon so it works a bit differently i think.
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  3. Sandip
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    Sandip Well-Known Member

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    Waterpump
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  4. steve bain
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    steve bain Member

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    actually, now you said it, that makes a lot of sense.
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  5. S3Lol
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    S3Lol Member

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    hmmmm, sandip, could this be my issue of running at about 100 degrees?
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  6. s3dave
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    s3dave TFSI Hybrid

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    thermostat stuck open ...and a failing waterpump
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  7. S3Lol
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    S3Lol Member

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    well the thermostat is about 2 years old but no guarantee its not messing up. If it was the water pump I would expect the temperature to go straight up. Mine just sits at about 99/100.
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  8. TDIQ
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    TDIQ 8L > 8P > 8V

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    So worst case at the moment is the waterpump? Is it safe to drive back about 30 miles at say 50mph? Obviously keeping an eye on the gauge.

    Cambelt is due anyway so will get it done tomorrow with some luck.
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