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Hi My 98 z3 recently starting overheating. It will run fine for first fifteen minutes or so then and temp will be right where it is suppose to be then in a minute or too needle will go all the way up. I am pretty sure it has to be either the thermostat or the waterpump. But is there any way to test which or am I better off just replacing both the car does have 92 k on it. Thanks for the responses.:)
 

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At that age your well past due for

Radiator
Expansion chamber,
hoses
pump
thermostat (and cover)

Best to do it all at the same time.
 
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