I have a '91 Taurus. I have pretty good heat. Unfortunately, along with the heat comes what I believe are exhaust fumes. When the car is moving, I don't get the fumes. But, if I stop for a light and the car is sitting, the car starts filling with fumes. If the light is long, I will have to open the window. What I have been doing is turning off the heater when i stop and then turning it back on when I start moving.
If it helps, before the car heats up and is blowing cold air, I don't seem to get the fumes. But, once the heat comes, so do the fumes.
This summer, I realized that when I used the air conditioning in the recycling-the-air-in-the-car mode, I didn't get fumes. But, when I used the "fresh air" mode, I got the fumes. Not as bad as when the heater was on, but the fumes were definitely there.
Any ideas and/or suggestions are welcome. Thanks.