One problem related to defogger has been reported for the 1998 Jeep Grand Cherokee. The most recently reported issues are listed below.
Have just been advised that a motor which operates some type of door to release heat and air in a 1998 Jeep Grand Cherokee needs to be replaced. It appears that no replacement is available and Jeep has a 1200 part backlog with no plans in the works to even begin production of this part for replacement. While one can conceivably do without heat or air conditioning, this is a definite safety issue as having a working defroster in the middle of winter is a necessity.