JJS Posted November 4, 2020 Share Posted November 4, 2020 Changed thermostat on audi a3 1.9tdi now my car is using colant? How much would have drianed when changing the thermostat? Quote Link to comment Share on other sites More sharing options...
cliffcoggin Posted November 4, 2020 Share Posted November 4, 2020 Jamie. Can I assume there is not a leak at the thermostat housing? Even if you topped up coolant directly after the change, it is inevitable you now have some air in the system which is slowly working its way round to the reservoir and so needs to be replaced. That may take several top ups and should eventually stabilise. Let us know if it does not. 1 Quote Link to comment Share on other sites More sharing options...
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