Several members have reported problems with the air conditioner compressor belt on their 1998-1999 D. They report that the mounting bolts were sheared off, and one reported that the compressor fell into the engine fan and ruined it. FL service centers reportedly have told them that this belt is too short and puts a lot of tension/pressure on the compressor.
However, FL in Gaffney says that the 17430 is the proper belt, but they recommend using 17435 as it can be installed over the cooling fan blade.
Personally, I would check and make sure that I had the 17435 belt, rather than take a chance on the 17430 belt causing a problem as some D owners have claimed.
The DISCOVERY OWNERS ASSOCIATION, INC, was formed to promote the sharing of information and the camaraderie of fellow Discovery motorhome owners. Membership in the club is limited to owners of Fleetwood Discovery motorhomes.