I have read other "overheating topics" but needed to add my own to explain other symptoms for my 1996 Tarago. * The temperature guage always sits just over half way and never goes to the red. * If I fill the radiator tank to the required level, it heats up and spits out all coolant out of the tank, * Today when I turned on heater, there was a 'banging/clunking' noise coming from under the bonnet. * If the van is stone cold (outside temp 5 degrees C), within 1 km the temp guage is half way and heater appears to be working a treat... * Exhaust sometimes smells like burnt gassy water and sometimes blows whiteish smoke... * OIL is not cloudy and is a good colour/level but sometimes I smell burnt oil smell... I am contemplating changing the thermostat but now I don't know what the problem could be??? I am assuming the thermostat is under the drivers seat, can anyone tell me if I need to take the drivers seat & floor pan out to change it?