The ARA unit also used this "engine load dependent" vacuum switch, since they were both "dealer installed" options. My '73 GT had an ARA unit and it had it. The ARA console is the nicer of the two units, IMO, and that old GM A-6 compressor, while it weighs a ton, is built like a tank. It's the ONLY automotive compressor ever made that has an oil pump in it, all the rest rely on atomized/splash oiling. I digress . . .namba209 said:This could be a long post, but I'll try to make it as short as possible for a start. There were 2 units installed in the GT, A GM unit and an ARA unit. They differed in where the compressor was mounted and the type of cowling used between the seats. Both had the condensor mounted in front of the radiator which caused the battery tray to be rotated 90 degrees and a hole had to be cut in the belly pan to remove and install the battery. Both had the cooling unit mounted behind the rear seats and a raised shelf was placed over the units. The GM used the rotary compressor mounted above the alternator, the ARA had the compressor mounted low on the right side of the engine and to the water pump. Both had lines running under the car, through the floor and in to the cooling unit and they both had two groove pulleys mounted on the crankshaft. The GM used a vacuum operated microswitch to turn the compressor on and off depending on engine vacuum. Those are the differences I'm aware of, I have/had a GM on my 72 GT, and when working it would throw ice cubes, figuratively speaking out the hole between the seats. It was missing the ducting between the seats and around the brake and gear shift. HTH. For a start.
Just so happens that Vintage Air is located in San Antonio as well.opel_nut said:I'm looking to install an a/c in my opel GT. I have the mechanical ability. I just don't have the parts I need and where to get them.
If they have, it's not been posted on this site. Having AC in Willit? when I bought it, and swapping out the engine/tranny, I can tell you for sure, the Sanden AC pump from Vintage Air will work nicely in a GT, just build up some brackets to mount it. It's about the same size as the alternator, maybe a bit longer. You'll have to have a condensor and dehydrator/filter mounted in front of the radiator, naturally. Which means you'll have trouble accessing the battery. The evaporator and fan assembly will have to be mounted behind the seats, which means hoses from the pump/condensor to the evaporator, just like the dealer add-on package. You'll also need to do the electrical and temp control package to get it all to work, but it's not too hard. It could be, all the components could be had from Vintage Air and just mod their components as far as mounting to get it to work. If needed I can take pics of the system I have in Willit? to give you and idea or two. All I'm going to be using as far as ducting is one outlet between and behind the seats, I didn't have the console ducting when I bought the car, but with that one large outlet, It cooled the interior quite nicely.I guess from the lack of response on the subject I can assume no one has done it.