Aircon Pressure Switch

Has anyone replaced the aircon pressure switch?

If so:
1) can it be done without depressurisation of the system?

2) is it as simple as it looks

3) where did you get the replacement switch.

Cheers!
 
I believe there's a valve behind it so you can do it whilst it's pressurised, you'd lose a tiny bit of gas, that being said it's been a while so don't quote me on it lol.
 
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