Engine Exhaust System problems of the 2015 Ford Edge

We've been experiencing an intermittent exhaust and sulfur odor in the cabin of our vehicle since we purchased it last July. The odor is present while running and parked, while idling at stop lights, while coasting along with traffic on the freeway, while accelerating or not, speed does not seem to matter. The fumes and odor have gotten stronger and have become so strong that we can't even drive the vehicle with the windows down. Our whole family has experienced headaches and severe nausea while riding in the car on both long and short trips. My daughter almost passed out on a recent hour long drive. We brought the vehicle to the service center twice now. The first time they replaced the cabin air filter. The vehicle is currently at the dealer service center. After we mentioned the sulfur smell we were told they would have to contact Ford motor company hq and open a case.

When merging onto the interstate and you accelerate and go from approximately 40 mph to 75 pmh there is always a smoking -burning smell coming out of the a/c exhaust vents inside the passenger compartment of the car. I had an explorer before and it did the same thing. I thought my engine was going to blow up even though it only had approximately 30k miles on it so I traded it. Now this Edge is doing the same thing . . . Is this an ongoing problem that is trying to be repaired soon. I asked if the 2018's had this problem the the Ford dealership said yes. Same thing happens when I pass someone on a regular highway any time you accelerate your speed from a lower speed to a higher one. Thanks.

Exhaust in cabin way beyond permissible limits from day 1. I suspected the firewall was allowing exhaust into interior, but then I started suspecting the rear was allowing exhaust in due to an air eddy recirculating behind the vehicle allowing exhaust into the cabin via lower rear door seal not sealing tight enough via the automated door closure not sufficiently forming a seal.