That's an interesting thought because 80 percent of the time it has happened when coming to a stop at a light. It has happened while just driving down the road but only a few times.

 

Could it be the heater core or even freon leak. Check your a/c and see if it gets cold.

 

The AC and heat both work fine.

Trying to think back to the times it has happened, it has been when the fan was on any setting i.e. defrost, lower vents, upper vents, AC. There was a period of time it seemed to stopped and then i relized it was in the off position.

 

Correction...The AC doesn't seem to be working like in used to.

05supercrew - you may be on to something. I was talking to someone yesterday and he said if there is a leak in the AC system it could cause an an oily smell and some smoke to come through the vents.

What tests should the dealer be doing or what can i check myself?