Vacuum down the AC system on my 84 Spider - Alfa Romeo Bulletin Board & Forums

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post #1 of 4 (permalink) Old 06-19-2016, 01:00 PM Thread Starter
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Vacuum down the AC system on my 84 Spider

I've rebuilt my AC system and am going to vacuum the system down and check for leaks, etc. and use R134A.
On the high side, do I connect the high side of my gauges to the D connector of the Sanden compressor or the connector on the dryer?


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post #2 of 4 (permalink) Old 07-03-2016, 02:19 PM
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are you using a manifold?

you are correct, connect your high/Red hose to the compressors D port and the low/blue hose to the S port.

open both the high and low valves for evacuating with a typical vacuum pump, usually takes 30 mins give or take

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post #3 of 4 (permalink) Old 07-04-2016, 03:21 AM
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Originally Posted by LBinNM View Post
On the high side, do I connect the high side of my gauges to the D connector of the Sanden compressor or the connector on the dryer?
Either one. Both fittings are on the high side.


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post #4 of 4 (permalink) Old 07-04-2016, 08:26 AM
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Don't use R134a, if you can at all avoid it. R12 is out there, on eBay and CL, and you can also use R152a, which is a fantastic refrigerant. Google it. R152a in my 31-year old BMW 635 gets me vent temps of 37-degrees. Also much easier on the compressor. R134a is generally not going to work well in any car unless you upgrade your condensor to a parallel-flow type.

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