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Hi, my name is***** this a 2002 Grand Cherokee? 4.0 liter?
Have you any other electrical problems when it rains or damp weather? Do the hazards work?
Have you tried replacing the turn signal flasher relay? It should be located under the drivers side dash.
Did you use an aftermarket flasher or one from a Jeep dealer? There have been problems with aftermarket flashers. Also are you saying the A/C stops working and so does just the drivers seat heater?
If you have a minute, there is a harness that incorporates all three of those components that runs near the transmission pan. It could have rubbed a bare spot on the harness.
Let me know how that harness looks and we can proceed. But if it has chaffing, check for any open wires and re wrap the harness.
Okay so I was correct about the flasher relay? Excellent. I am glad we found your problem. Thanks for using JustAnswer! Let me know if there is anything else I can do for you before you rate my service!
The moisture/dampness may not be a coincidence. Hairline fractures in the solder points inside the flasher may still be an issue. If you are still having problems I would still recommend a new flasher preferably OEM. I am glad it is working for you now.