Two problems related to engine cooling system have been reported for the 2000 Audi A6. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2000 Audi A6 based on all problems reported for the 2000 A6.
2000 Audi A6 4. 2l v8 quattro engine cooling system failure. The plastic coolant pipe between the oil cooler housing and the engine block fails causing potential catastrophic coolant loss, overheated engine and potential fire. The plastic pipe hardens/crumbles with age, approximately 10 years and 135k miles. I replaced the pipe. . . It takes about 10 manhours. The replacement Audi part is maybe $20 but it is still plastic. I replaced it with a billet aluminum part with double o-rings. Dealer wanted $2900. 00 to repair!! I understand this part is on every 4. 2l v8 on both A6 and a8 cars from 1998 to current 2010.
A strange noise from the engine compartment of a 2000 A6 Audi began several months ago. The noise became progressively louder. I then suspected a water pump malfunction was forthcoming. The vehicle was taken to an Audi dealer for evaluation. They determined that the water pump was defective, and recommended a replacement. Most people would not have recognized this noise and an on road accident could have taken place on a freeway when the engine would have overheated and seized. Since there was only 31500 miles on the vehicle I am concerned that this type of problem occurred at all. Either the pump shaft was bent by an over tightened belt or the part was defective at manufacturing point. (the belt has never been adjusted after purchase).