No practical advice for the poster, but this problem simply re-inforces the false economy of not running the A/C system. All stems back 20 years or more when A/C was only found on luxury motors, and your dad would tell you that it increased the mpg by 10% or more.
Modern systems use nothing like as much power, and they prefer to be in constant use rather than left off for weeks at a time. The repair costs of an under used system will far exceed the cost of leaving them switched on.
In high-end cars the default is to have the system on, and you have to actively switch them off. There's also the mis-guided folks out there who only think A/C is for summer, it's actually more important in the winter where it dries out the air in the car and stops steamy windows.
I've never seen the need to switch it off in any of my cars over the past 15 years...
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