A broken seat heater element located in the seat cover may make the seat heater inoperative. The condition usually occurs in the seat bottom; two repair kits are needed for each seat.Google+
Car Problem Reports
Jeep Grand Cherokee Broken Seat Heater Element May Make Heater Inoperative
Jeep Grand Cherokee Problem
Average Mileage: 101,000 mi (78,000 mi - 115,000 mi)
Visitor, 1997 Jeep Grand Cherokee, 78,000 mi
Have not repaired yet.
The seat grids have failed. Where to get new ones and the replacement procedures
No heat on Drivers seat.