Heater seats dont work but light comes on.

you need new heaters. I've replaced dozens on that model.

You have a leak in your air conditioning compressor Your system works on the reheat principle All air passing through the system is cooled and reheated before it enters the cabin this sould be dehumidified air but it passes through the heater core and sence the air is not dehumidified you are getting condansation as the air flows the heater core that is heated by the engine heat and the water is from condencation because of the leak in the ac compressor The unit is a press fit in the center of it and fials unfortinatly a lot with this disgien of compressor

First off, I would contact your local Jeep dealer and have them run your VIN # to check for any recalls. The 1999-2004 Grand Cherokees had a recall on the seat heaters. If your vehicle doesn't fall into the VIN # range then either your seat heater switch has gone out, or you have a broken element in the seat heater. I have replaced more seat heaters than switchsm the elements heat up and break. Hope this helps out.

Best of luck

hi
contact your jeep dealer as there was a recall for the grand cherokee heated seat pads as some of them heated to much and set the seat on fire... they will replace them free off charge.
hope this helps

hi
contact your local dealer, all grand cherokee jeeps were recalled for faulty heated seat pads. they will replace them free of charge
hope this helps

check the fuse for the dash for the seats.

hi this could be down to bad conetion on the wireing , check all conections , clean them down , if that doesnt work then its in the electris somewere . you need to trace it ,

I have a 2002 Grand Cherokee Special Edition and the same thing happened to my heated seats. The light would come on but the seat would not heat up. In my case the Heating element burned out and needed to be replaced. I got it fixed at the dealer and they said this was common and earlier models had a recall on it. You should contact your dealer and see if your year had a recall for it. It was not too bad, about 300 bucks. For an hour work.

Likely, the heating element in the seat has failed. The reason is simply that the drivers seat is in use more than any other seat in the vehicle. You can check continuity of the element with an ohmeter across the seat side of the heater connector. Check for power at the harness side with a volt meter. If there is power but no continuity, heater element has failed. Personally, I'd probably just live with it but you can either attempt to install a new heater element or if you can find a similar seat in a salvage yard, just buy it and put it in! (whole seat probably costs less than the element!!!

Sounds like the same problem I had. I brought it to the Jeep dealer and they told me that the heating element in the seat stopped working. They told me that the only way to repair was to take the seat apart and replace the heating element in the seat. Of course they will charge you the standard $80 to tell you this. and then quote you $500 plus to repair. I can't even remember how much, I have decided it was not worth it.
Also this website could help you:
http://www.wjjeeps.com/seats/seats.htm