It was replaced about 25,000 miles ago. That was in 2007.
I'm pretty sure the compressor stopped running and everything else is working. The blower tried to compensate.I'd suggest taking it back to the shop. You paid them to fix it, and it still has problems. It may be multiple problems related to the engine cooling and a.c. systems. Or there may just be radiator fan problems.
I assume when you say the a.c. stops working, the cabin fan is still blowing air - it's just not cooling.
My family owned several Intrepids over the years. The biggest fail point with the AC system was the evaporator. I recall the Chrysler dealer asking my Dad $3500 to replace just the evaporator on his '02 SE - and that was at employee cost. He told them to shove it and bought a new '08 Charger 3.5 when Chrysler was giving them away.It seems, whatever is controlling these systems isn't working properly or it is and something else isn't working.
He said he looked through the opening and saw it had broken off. A 26 year old brittle plastic part. It was laying there. I guess the mount broke. I don't know what prompted him to check that. The evaporator was replaced about 10 years ago with a Chrysler brand one at the same place.Never heard of the temp sensor breaking off the evaporator (and from reading your post, they won't warranty anything since they're likely considering this a "new" issue). Sort of makes me suspicious if the shop is deliberately breaking other parts in order to raise costs.