Air Conditioner problems of the 1999 Ford Expedition

Tires: had a blowout on the highway in April of this year. I went to the nearest firestone dealer. He inspected the tire and reported that it was defective and not repairable, so I bought a new one. Ever since this happened, the vehicle vibrated terribly at highway speeds. Reported (3times) to dealership since April. Each report is documented. Allegedly fixed each time. Finally on 8/04/00 the tire was declared defective by the dealership and was replaced. (I have documentation/receipts on all work). Problem is that the truck still vibrates at highway speeds although at lower mph than previously reported. Air conditioning: first reported strong moldy odor back in Jan 1999. Was told by Ford service rep. That it was due to the truck's having been idle in the hot sun/parking lot prior to my purchasing it. I was told that it would dissipate in time. It did not. I brought it in three times since then. Each time I asked that the cause be fixed and not just the symptoms. On the 4th visit, I involved the owner and his dealership hired an outside company to remove the mold from the system. They claimed to have done so but during the cleaning process they added a chemical/perfume that is so strong, one cannot tell if the actual problem is still present or not. I was told (by the service rep) the owner was so offended by this smell that he had the company come back out & redo the truck to remove the added chemical. They were unsuccessful as it smells very strong even today (2 weeks later). My concern is as follows; if they removed the mold and smell then why would they need to add a chemical/perfume? I believe that they added this chemical to mask the fact that the mold is still present. I think that all they were able to do was overpower the stench of mold by adding this fragrance. I want the cause of the problem fixed, not just the symptoms. Having mold spores blown into my face is a risk to my health and is of serious concern to all. My truck is not the only one.