Foggy windows in 89 735i

Hi,

I have an 89 735i, it is the second one I have owned and have had this one about three years. The windows seem to fog up excessively. If it is raining out or I have one or more passengers in the vehicle I have to keep the defrost on and it only manages to clear the front window. If the car sits in the sun when it is a little cold out I have to take a towel to the windows before I can drive.

The heater core appears to be okay and the coolant level remains constant. I cannot find a leak or any moisture in the car to suggest a leak. I do not remember my last 735 having this problem. Do any other 735 owners have this problem? Is there a fix?

Mark