The LS1 A/C system is pretty easy to get working in a 240SX. The only real issue is the fact that Nissan used special fittings going into the evaporator under the dash. I took the old Nissan lines and cut them off. I bought some low temp brazing rod and attached standard A/C bead lock hose fittings. The high pressure side I cut off about 18″ long so that it could pass by the headers before it went to a rubber hose. The suction side runs up and over to keep away from the headers.
Here is the compressor mounted up. I used a “doc’s blocks” rear block adapter to convert the compressor to #8 and #10 standard a/c fittings. Doc’s stopped selling parts a while back so this crucial part is not easy to find any more. I got mine on eBay.
I used an aftermarket hot rod condenser up front. It is a parallel flow setup and is much more efficient than the factory Nissan unit. It is also about 4″ narrower than stock. I copied the mounting of the factory Nissan unit and it is fully isolated using the Nissan isolators and grommets.
Overall the engine bay doesn’t look too cluttered even with the extra hoses in place.
Driving at highway speed this setup will blow air in the mid 40’s with outside temps in the high 90’s.