My 990 overheats, in slow traffic and i Colombian low land temperatures and in city traffic the thermometer crawls up to the second but last bar and the fan is running the whole time blowing hot air on my left knee. The only thing that I can see is that the coolant level never moves in the expansion bottle, always sort of mid level. It warms up reasonably quickly and according to a mechanic in Guadalajara the thermostat is ok. He's changed the coolant by the way and it made no difference at all. It's bit depressing sitting in rush hour traffic and knowing it's overheating and maybe it'll stall due to high temp. The Colombians will lynch me! waterpump? burp? It runs well by all standards.