What is this smell, ammonia? If so the system has a leak and is gone.
If the frig. is still OK and you replace the coil make sure you get one for that model as there are dozens to pick from.
WBCCI 12156 AIR 3144 WACHUNG TAC NJ6
2004 Excursion 4x4
1991 34 ft. Excella +220,000 miles, new laminated flooring, new upholstery, new 3200 lbs axles