i've got a series 3 lightweight with a 2.5 petrol out of a 90 i put a 4 core rad in a few months ago with an 88 degree thermostat and its was almost always in the red regardless of drivin enviroment. so i currently run without a thermostat and have noticed that around town the water temp gauge reads at just abouve normal but when drivin on motorways or dual carriageways it runs almost totally in the cold area any suggestions on what to do would be very gratefully received