Andy,
The compressor installation for the 4.2 is different than for the 3.8. Below are photos of each. The 3.8 has the compressor on top. I had to buy a crank and water pump V- pulley. I don’t know if you’d have to use special pulleys for the 4.2, but you might be able to tell from the photos. I know they supply the idler pulley(s) in their kits. (I’ve heard that they sell a retrofit Sanden kit for factory AC equipped cars, but don’t know if they use the original brackets).
The evaporator is modeled off the original OEM unit (but with bigger vents). Plenty of leg/foot space on the passenger side for the unit in my car. I did hear that they were going to move the fan motor to the bottom of the unit, so it would hang down a bit more than for my installation (motor is on top and in a void in the under-dash structure). I believe the factory units had the motor on top, so your car would already have that cutout. You’d be way ahead of the game with the proper cutouts for hoses.
I modified the original console, which is pretty straight forward on an S1. What’s in there now is temporary, as I might fit a radio later, and I also want to make the front panel more like the original.
I fit a larger idler pulley on my S1 as it gave me a larger contact patch on the alternator pulley and reduces the severity of the reverse radius on the belt. The top mounted alternator for the 4.2 allows for a larger and probably more powerful unit…obviously a plus.
I located the accumulator under the brake reservoirs instead of on the same panel, as I didn’t like the cluttered look with a high mount. I therefor had to fabricate some new hoses. Best to ask them for adequate length of hoses and loose fittings if you want to modify anything. The accumulator bolts to the lower S2 heat shield that I subsequently purchased from one of the usuals. The photo is from during the trial installation, In any case the hose runs are now hidden by the inner fender/mud guard.
Didn’t care for the evaporator mounts in the kit, so fabricated my own. Happy to share photos of that later if you buy a kit.
Original brackets for the forward (firewall end) radio console supports are blocked by the evaporator. No work around in the kit…had to fabricate something. By the way, I dumped both evaporator drains out the passenger side, so that water doesn’t drip on hot exhaust pipes.
The discharge hose hook up to the evaporator is ridiculous. Solved with a right angle elbow, which also moves the hose inboard (not directly over drivers leg where there are reports of condensation drips).
You have to bend your own condenser brackets for the S1. Think the S2 brackets come in from the side If not, make dang sure they angle downward at a steep enough angle to clear the bonnet when closed (I had to redo mine…good thing I caught it before bumps showed up on the bonnet.
