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Coolant problems still TDI 130

Discussion in 'A3/S3 Forum (8L Chassis)' started by @udi A3, Oct 10, 2012.

  1. @udi A3
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    @udi A3 Active Member Site Sponsor

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    Ive noticed the coolant takes a lot longer to get up to temp now.
    previously it was sitting just under 90 on the dash, and dropping off slowly when driving, i changed the thermostat. Occasionally it still drops while driving but the heaters stay hot.

    Ive checked channel 51 on the aircon unit and it reads a steady 75'c when warm even when the needle drops.

    How to test each sensor is working properly with vcds logs?
    I know some dashes have this fault, it did this on my last dash too though, but im sure the 75'c is too low and its another problem.

    thanks tom
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  2. Vex182
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    Vex182 Guess what I drive...

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    Check 49 on the control, should be around 100 in day to day driving when warm.
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  3. @udi A3
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    @udi A3 Active Member Site Sponsor

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    Ch 49 maxed out on 92'c when warmed up over a 30 mins ish drive, and stayed there when i had a spirited drive home.
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  4. Vex182
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    Vex182 Guess what I drive...

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    That sounds to me like either the temp sensor is not reading correctly or the thermostat is stuck wide open.
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  5. @udi A3
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    @udi A3 Active Member Site Sponsor

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    Ill get a thermostat fitter first then, i need to change the coolant and a pipe anyway.
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  6. Vex182
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    Vex182 Guess what I drive...

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    Yeh I would check it again, pop it in cold water then boil the water and see if it open. Should of course close then as the temp drops down again. Might be just a duff one you fitted unfortunately.
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  7. @udi A3
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    @udi A3 Active Member Site Sponsor

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    ended up replacing the coolant temp switch. its been working fine, still a while to get up to temp, but i guess thats down to cold weather.
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  8. jojo
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    jojo S3 Drift King! Staff Member Moderator

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    Diesels just take longer to warm up compared to petrols from my experience.
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