I made a little bit more progress with the air con project today. That said, its going slower than I hoped both because I've had less time to devote to it than expected and it turning out to be trickier than I thought. With our upcoming overseas trip I now doubt I'll have it all done before the weather is such that I'll need it. Oh well!
In finally getting the condensor and drier in place, the instructions then call for the relocation of the driver's side horn to share space with the passenger side one as it would be in the way of the hard lines through the radiator support in its original location. This, at least, was reasonably straightforward with just a small bit of wiring needed to extend over the other side.
So the next step is to cut some holes in the radiator support for the hard lines to pass through. They provide this template to stick on the engine side so that the two 1 1/4 inch holes are in the right place.
Sounds simple but of course there are all sorts of bits and pieces in the way. First step was to remove the flash stainless steel coolant overflow tank but even this wasn't straightforward as the bolts holding it in place to a flange on the radiator itself were hard up against the plastic shroud around the electric fans and I couldn't get any sort of spanner on them. The fan shroud therefore had to be at least loosened at the top so it could be tilted out of the way enough. This was also pretty fiddly with tiny little allen headed screws holding it in place. Anyway, I got the overflow off. I think I'll probably have to modify how this is fitted to put it back as it'll interfere with the hard lines.
Before
and after
Then I removed the voltage regulator you can see in the "after" pic and, following Coolabah's earlier advice to the letter, applied masking tape to the drill site.
I may add another layer of tape before I hold my breath and start drilling. Before that, though, I have to find my right angle drill attachment as there's no space to do it without that. I bought it 12 years ago when I was rebuilding my previous Mustang, used it once for something to do with that, and put it somewhere safe, but that was at our previous house.