Chungstyle

Hey folks. I got another problem for you to try to solve.
1.) The SC400 is smelling a bit on the outside and it smells a bit like either burning oil or exhaust I guess is the best way I can put it.
2.) Not only is the smell coming from outside the car when it's off, but inside the car as well through the vents. If I turn the A/C on cold the smells dissappears a bit, but the minute I either try to turn the heater on or just vent, the smell stinks up the place.
3.) The smell inside the car gets worse if I leave the car off for several hours and I return to it when its off.
4.) The most annoying part: The heater doesnt work half the time... it just blasts cold air and warm for a bit then goes cold again. But the ANNOYANCE: On the highway, if I have the A/C unit off even off vent, there is still air coming in from the vents thats very warm and the smell continues. I just dont see why its happening if I have all the vents and stuff turned off. Any input?