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Replaced Thermostat

Discussion in 'A4/A4 cabriolet/S4 forum(B6 chassis)' started by SL11CKK, May 2, 2013.

  1. SL11CKK
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    SL11CKK Active Member

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    [May 2, 2013]
    Ive just replaced the thermostat again because its not going over 60 degrees and then going back down when driving.

    Now ive replaced it under warranty and bled it for good 20 minutes. What I dont understand is that its bang on 90 degrees on the cluster however if I go and touch the coolant its ice cold however the heater matrix pipes are blazing hot.

    So im thinking its a faulty thermostat?

    What you guys think?
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  3. Mike B
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    Mike B Member

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    [May 2, 2013]
    Is the rad hot ?If not the waterpump may be failing
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  4. SL11CKK
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    SL11CKK Active Member

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    [May 2, 2013]
    I couldnt touch the rad, but the top pipe going into the rad was cold.

    I changed my waterpump when I did my timing belt not too long ago. All from dealer too.


    Also it doesnt seem to be overheating either.
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  5. Ian-83
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    Ian-83 Member

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    [May 2, 2013]
    The pipe from the thermostat housing to the rad will be colder to touch than the hose from the rad to the block. Have you checked it once the cooling fans cut in? Usually a good indication the thermostat has opened and the coolant is circulating and being cooled in the radiator.
    #4

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