'91 190E heater is always on...

So on my 190e water is always flowing thru the heater core. Only odd thing I can think of is that the Radiator indicator saying the coolant level is low light is active on the dash. The coolant isnt low I think it is just a false indication. Car does not over heat and the coolant is flowing throughout the system.
 
The hot air ONLY blows thru the two outside vents on the dash and the two inside vents blow normal (i.e. AC or outside air) AT THE SAME TIME... never have I seen anything like it. I really wonder if the cars internal cpu is telling it to run the heat to keep th ecar from over heating.
 
any ideas or known problems with this?
 
thanks in advance

I'm stumped. You might want to try 190revolution.net...you would get an answer in minutes from 190e owners