My gen 1 RX had this issue twice. Well, it looks like it's happening again. My auto climate control gets "stuck" on cold and won't adjust the temerature of the air coming out of the vent for the temp I set. I know this is the case because the passenger side is like Siberia and my side is fine (all with temp set at 73 on both side).

this was a very popular topic in gen 1 RX and GS forums. I thought Lexus sorted this out but guess not. Anyone with the same problem out there?

 

I see you have a 2013, do you have so many miles you are out of warranty?

 

It's a CPO and I'm under the warranty. I dread going to the dealer, however. I'll tell him it's the air mix servo and he'll probably ask me "what's that?" Some years ago when this happened to my gen 1 RX they recharged Freon gas saying that my car was fixed. I guess i'll give it a shot again.