One problem related to rear window defogger has been reported for the 2002 Jeep Grand Cherokee. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2002 Jeep Grand Cherokee based on all problems reported for the 2002 Grand Cherokee.
The heater / defroster stopped blowing hot air out on both passenger and driver's side of vehicle causing dangerous conditions while driving in cold conditions. I live in colorado and the other day even the inside rear view mirror was frozen and was no use.