Hello to all i recently changed water pump in car (1995 S600) along with new coolant before i changed waterpump the electric fans would come on when it would start to heat up. now with new pump as soon as i turn on the car doesnt matter what time of day or night the electric fans start running is this normal? what did i do wrong temp stays below 80 i put all wires and plugs were they go. maybe i need to change thermostat? it doesnt heat at all but im guessing they are not to be running all the time and i dont have ac on. Any ideas?

Check your connections on top of the thermostat. They are not seated properly. i had the same problem. Hope this helps.