You'll find that if you are using the sill jacking point its not uncommon for a small mod to be made by yourself. Take a small piece of wood 1/2" inch thick, cut to fit snug on top of your jack or stand and saw a slot down it about 1/8" deep to fit on the sill point. Otherwise you are still able to use the main garage jacking points as in the schematic that you have probably seen earlier.
If your taking half an hour before the air con kicks in then you do have a problem, take it to an air con specialist mate, they are at least the least expensive guys in the market. Probably needs re-charging.
Air con in all my cars does not come on straight away after starting the engine until it has warmed up to normal running temperature.
Are you saying that you expect the aircon to work straight away after starting your engine?
It relies on your engine to gain its running temp to be able to adjust hot to colder mainly with freon gas or a similar gas.
Overall aircon takes the heat away to make your air cooler than the cars running temperature. I find that mine takes about a couple of minutes to gain some heat that can be conditioned.
Just seen this, hope he hasn't got any kids, especially if they play with their special friend that does not exist. He'll have them out the front cleaning his non existent car.
I wonder if he's on face book?