I have 97 merc villager with 0ver 130K miles, which keeps overheating. The temperature gauage does not show it over heating, but you can just see the smoke coming out from under the hood after only driving about 5 - 10 miles. The fluids all look great, and as the car is idling it does not get that hot and there is no smoke. this only happens when you drive the vehicle. The smoke smells like antifreeze, if this helps. Also, the water pump is not squealing. Could fluid be leaking from another point onto the manifold or engine causing the smoke, but truly not overheating?
just food for thougt