The thermostat may erratically stick open or closed. The can result in illumination of the Check Engine Light and/or engine overheating.
Average mileage: 50,404 (12,700–89,000)
19 people reported this problem
A4 overheating, mechanic stated termostat needs replacement. cheap part, high labor... 5.8 hours. I asked if water pump should be replaced at same time and was told no necessary.
Usual plastic bs thermostat on the new 3.0L engines snapping and getting stuck in closed position. Audi replaced it after fighting with AOA about it, since it's a common failure and they refuse to make a proper metal thermostat that won't just snap off because it's plastic and brittle after being in hot coolant for thousands of miles.
Driving normally and warning light came on. Well maintained, dealer certified car that was purchased as CPO and I'm glad I was covered under warranty. Dealer said its a common problem and knew exactly what was up. Also replaced my fans but I didn't know why the fans broke down. Cost me only $75 because I was covered.