A/C Install, The quest for coolness begins Options

[jPs]

I know most of y'all take A/C out of your 914's but I'm hoping to add it and am wondering if anyone can give a little advice.

I just aquired an old underdash unit manufactured by Heatransfer out of San Antonio, TX. I've read that VPC and DPT made underdash unit and so this might be a little unique...I dunno. At any rate the underdash unit appears to have everything needed such as expansion valve, standard pcar looking blower motor, etc. From the unit runs a red line (12v hot), green (ground), and red (compressor relay). Bench test shows that everything appears to work correctly and I also have picked up the original York compressor and a relay of some sort with the unit but I've no clue how it's to be wired or what. Below is a picture of the connectors and the only info on the relay is 150-10 12V.

Forgive my ignorance here but first does anybody know what the relay pinning is or is it even really necessary to run a relay. From what I can figure I should be able to connect (red) compress relay line direct to the compressor and evaporator fan and I'm guessing the underdash unit would trigger the compressor and evaporator fan to kick in as needed....am I off base here or do I need a go-between relay some where in this picture?

I have access to R12 and evac machine on the cheap and so I may upgrade the compressor down the road based on performance but for right now I'd like to get it all hooked up and see how it runs to begin with.....any advice would be GREATLY appreciated. I am willing to buy a new relay but admittedly I'm clueless on what I would need.

[jPs]

The PO had the engine rebuilt and the pulley was missing. I picked one up from slits here on the board and plan on installing it.

I'm planning on installing all new hose line that's 134 barrier and o'rings. however I'm gonna run r12. I have free access to a friends auto repair shop and he has all the needed equipment to evac, charge, etc and all I'll have to pay for is r12 and oil. He's pretty cool about everything it just has to be done afterhours and I have to do all the work myself. So basically I'll get it all plumbed and ready at my house and then over to his shop for the rest of the work. I still need to checkout pricing on hoses just haven't had time.

BTW: The old hoses were so brittle they cracked when pulling them out. The hardline is pretty much fubar with stuff in the line.

The compressor I picked up, while it weighs alot is in very good shape, the oil was clean and I couldn't find any debris so I'm gonna use it for now. I actually prefer to run r12 as it's superior to 134 (IMHO) and from my perspective the enviromental folks can (IMG:style_emoticons/default/pissoff.gif) I actually live in farm country and if you saw the cars around here mine is an epa dream in comparision.

Regarding the venting of the trunk I agree. My rough plan was to cut the tow hook as it's worthless and I will be welding in a scoop but I'll probably use a heavier gauge of metal to stand up to armadillos that are always on the road in the early morning and evenings. No sense in having bent up tin underneath if necessary. I'm also going to install galv. mesh to keep out the rocks. I pulled several 1" rocks out that had found themselves lodged around the condensor.

Keep the ideas coming as it makes one think more before throwing things together plus this thread will probably help someone down the road as I've learned more from this board than any manual can provide just in the past searches I've done.