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I also own an Audi TT and just replaced its Audi oxygen sensor last month. There are many parts that may cause overheating. One of it is loss of coolant because of a leak. Possible leak points include hoses, the radiator, heater core, water pump, thermostat housing, head gasket, freeze plugs, automatic transmission oil cooler, cylinder head(s) and block. Check on these parts and do something about it.:cool:
 

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mikee3 said:
over heating proublem on my tt
There is a plastic thermostat housing that can crack or distort easily. Already replaced that on my car. They are about $29. Check for dripping antifreeze or the smell of a coolent leak.
 

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BLOODY HELL.These lot will have you buying another car.Water pump impellor breaks away form the pump.Check you have coolant returning to your header tank.if the answer is no then its 95% waterpump.Also the old dash insertproblem that can read high values.WATERPUMP WATERPUMP WATERPUMP
 
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