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jPs |
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Newbie ![]() Group: Members Posts: 46 Joined: 17-August 04 From: Austin, Texas Member No.: 2,554 ![]() |
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. Attached image(s) ![]() |
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Kerrys914 |
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Dear, the parts I just sold paid for that part ;) ![]() ![]() ![]() Group: Members Posts: 1,568 Joined: 26-December 02 From: Williamsburg, VA Member No.: 16 ![]() |
I have the DPD system in mine with a few tweeks and have R134a in it.
DO a search here and on the bird board..but here are some of the MUST do's for a conversion to 134a but most aplly to R-12 too: - Replace the drier - Get new hoses - Get a new fan, electric ones are cheap and will help with the vent temps - Replace the TXV (expansion valve) for the evap. These run about $30 - Flush the system and add NEW oil. - Pull a deep vacuum for about an hour and charge by weight - Get a binary switch for the high pressure cut off I was going to put a WOT switch in but decided against it. Every time you let off the gas the compressor would kick-in feel very funny with the on-off-on-off-on-off. I installed a nice switch to kill the A/C if I was in need of some extra horses. It only takes a second to flip the switch and it will keep the A/C off untill you pass that dam miata (IMG:style_emoticons/default/smile.gif) (IMG:style_emoticons/default/smile.gif) (IMG:style_emoticons/default/driving.gif) Best of luck |
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