Just adding myself to the rolls of those who have had the air conditioning fail on their 2014 i3 Rex. Car is still under CPO warranty until June 2021.
I took it in back in July here in Denver, because, at 56,000 miles, the AC started working only intermittently. I told them I had to keep it set on 60 degrees and control it manually to get it to work. They returned it to me with a note, "System working, unable to replicate symptom."
I returned it to the shop last week. After a few days, got a video by email from the technician - compressor has failed, threw metal filings throughout the system, needs to be replaced. The shop called me shortly thereafter, said it needs between $10k-14k worth of work, they will have to get approval from BMW NA, because all the AC lines, the compressor, and the condenser would need to be replaced (as described in other's posts on this thread). I told them I had read these threads, was alarmed at all that would have to be done and what the cost would be, so to please let me know as soon as they got word back from corporate. They said it could take a while to hear back from corporate, then 8-15 days to order the extensive list of parts required, then time for the labor.
That was Friday, this is Tuesday. I got a text this afternoon stating that my car was ready, and they emailed the invoice. All the work was covered under warranty, but they replaced only the compressor and 3 gaskets, with the following notes: "Metal in lines, created TSARA case, stated replace compressor and perform running in test plan. Replaced and performed required test plan. System now operating at high capacity and acts like normal. TSARA did not require for system to be flushed. Dryer filter will clear system and trap one contaminates."
I called BMW NA and was told they defer to the dealer. I called the dealer, and was told they defer to BMW NA's regional technician and can only do the work authorized by them. So I wasn't left with a choice, and I picked up the car last Wednesday.
The good news is, it's still under warranty until June of next year.
I guess we will see what happens in the coming days/months and I'll post an update. I don't feel confident that this isn't just going to happen again down the road.