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Help A/C Upgrades questions

mdurbahn on Mon May 26, 2008 11:57 PM User is offline

Year: 1979
Make: Porsche
Model: 930
Engine Size: 3.3
Refrigerant Type: r-12 or 134a
Country of Origin: United States

I have a classic car, 1979 porsche 930. The a/c is very poor at best in these cars. I added 2 more condensers, replaced the york compresser with a sanden 508, got all new barrier hoses so far. Now I am too the point where I am ready to flush the one old condenser I reused, finish the wiring, and evap and charge. I have some question though..First when I got the new hoses I wanted a high/low pressure switch too, the switch has 4 wires sticking out of it...I have no idea where these go...anyone have a clue what to wire them into? Second, If I chose to run R134a would I need to change the expansion valve? Would the fitting be the same? Can I get one from this site?

Thanks, Matt

TRB on Tue May 27, 2008 2:53 PM User is offlineView users profile

R12 valve should be fine. No clue on the type of switch you purchased. Most Low/high binary switches have two wires.


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mdurbahn on Tue May 27, 2008 4:00 PM User is offline

When I got it, they told me I would only need to hook up two of the wires...The thing is I don't know where to hook them up to?

mk378 on Tue May 27, 2008 5:50 PM User is offline

Find which two pins on the switch are closed at normal pressure with the compressor off (about 50-100 psi). Wire those in series with the compressor clutch, so the compressor will stop when the switch opens. The other two pins are to control condenser fans, they will close at about 200 psi.

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