Engage/test airco after years of not using it

[Landy7]

I have a 2.4TDCI defender but it has been sitting still for years. Changed oils etc and already done 1000 miles without issues but did not yet enable airco. Can I check some things first before engaging the airco? Never had a defender with airco before so that part of the car is new for me

[western]

Might be worth having the system leak checked & recharged with the correct gas to ensure it operates properly.

[ballcock]

I would check that the fan hasn't seized in front of the aircon rad.