rt1002002

ever since i got my '87 924s its never really had ac. it blows kinda warm and upon inspection the ac compressor has a loose wire and i have absolutely no idea what it goes to. i have some pics but i also would like for someone to tell me if it has a 134a swap.(based off the fitting)I live in sc so it gets pretty hot.thanks.also whats the yellow wire for ?

V2Rocket

that wire in the last picture is the wire that controls the AC compressor clutch, there should be a male mate wire coming off the AC compressor that goes into that connector.

Jfrahm

Looks like a quick release R134A fitting.
http://www.aa1car.com/library/r134_service_fitting.jpg

Tiger03447

looks like a 134 fitting alright. You need to take it to an a/c shop where they can pull a vacuum on it. An essential step prior to recharging. Otherwise you will probably trip out the high pressure limit switch before you get any cool. Also expect to have to replace the receiver dryer prior to recharge. Stay cool in SC!!

PaulD_944S2

No need to vacuum if it still sealed system.

Press the tiny stem inside the R134a adapter. If you hear a hiss then the system is still sealed and you can proceed with adding R-134a into the system. No hiss means you must find the leak or damage and evacuate the system.

Here's a good link that will walk you through the re-fill process:
https://edelweiss.smugmug.com/Cars/P...tioning-Gauge/

Otto Mechanic

Just as an aside, you can get a vacuum pump off eBay for about $70 and a gauge set for about $25. My experience has been most shops will charge more than that just to do the diagnosis.

But as Tiger says, if you have a leak you need to find it. One way to tell for sure is to pull a vacuum on the system then see if it holds vacuum for at least 20 minutes, but to do that you'll need a pump and gauge set to start.

These compressors (usually the source of a leak) can be re-built pretty cheaply. I did my 928 compressor for about $25 in seals.

Otto Mechanic

Forgot to mention the place you can get cheap seal kits, Century Auto Air Conditioning in Tuscon AZ. http://centuryautoair.com/

rt1002002

thanks guys it did hiss.I noticed the ac clutch doesnt turn and where should i find the male connector ?

PaulD_944S2

Both R134a connectors are the same style but slightly different in size.

Low pressure service port may be on the compressor, or in that immediate area.
High pressure is the larger of the two service ports, where the "red" hose would connect.

rt1002002

Little update I found the male plug and the compressor only kicks on when the fresh air fan is on. The freon levels are okay.

Otto Mechanic

Sounds like all you need to do to begin is get the compressor clutch going.

rt1002002

What would that take ?

Otto Mechanic

I suppose I'd make sure your compressor clutch was connected to the head unit of your AC? I'm not certain about the 944, but one way to force the clutch to engage in some cars is to turn on the fan.

You should have a signal from the A/C head unit (the one the interior temperature gauge is connected to) that engages the compressor.

The other problem may be you have air in the system, which doesn't compress and expand as well as freon so it just doesn't work as a coolant.

Otto Mechanic

I'll just assume you turned the thermostat way down?

rt1002002

yes