I replaced the thermostat recently. It got hot during a 5-10 mile trip in town. I never heard an audible warning, but all of the sudden noticed the temp meter nearly pegged. Not sure if there is an audible alarm with aveos. I had to stop and let it cool down a couple of times to get it home. Since recently replacing the purge valve solenoid it has been running as strong as it ever has. A few months back before the thermostat replacement I noticed some hesitation under heavy acceleration, but that is gone now.... Just this pesky startup issue and the fouled plugs. Someone else mentioned to me that maybe the E3 plugs are running a bit too hot. I'm gonna get a new set of OEM or double platinums most likely tomorrow.