Re: 03 Taurus Window Fogging
We have that problem on our 2000 Taurus. After searching alot of people said heater core. However we have no loss of coolant and no smell of coolant. Next, and a more likely culprit was the evaporator core. It is either leaking or blocked. Third option a friend mentioned was the in cabin air filter. Well I tried this one first and it is 85% better. Then again, I should mention that we live in a cold climate and when on the highway, the windows would ice up. Now they are pretty decent. Far from perfect, but still reasonable. It was like a $15 item, the cabin filter, and you can find it under hood at the firewall. There were 3 or 4 clips, 2 screws, and a bit of work with smaller hands. It definitely made a world of difference.
Hope this helps.