One problem related to defogger has been reported for the 2007 Jeep Grand Cherokee. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2007 Jeep Grand Cherokee based on all problems reported for the 2007 Grand Cherokee.
Heater started blowing cold air on drivers side. Blend door broke and fell down inside the dash. I paid $130 for "heatertreater" fix and repaired the broken doors by converting the dual controls to single drivers side control only.