Air con is not covered by Motability as in the past the servicing dealer for my VW cars never had the service of the AC but did not stop them calling me to have it done. I always tell them if Mota pay I’m happy to spend my time at the garage while they do the AC service. They never call back.
That said with my cars always being renewed at 3 years its never been a problem for me anyway but generally they do say to have it done every 2 years but its not my car so why worry as long as its working…. without smelling.?