Mike951

What capacity of oil and refridgerant goes into a fully evacuated system on a '87 924S?

Thanks
Mike

83na944

R12 - 100 ml of oil and 950 g of R12.

R134 - 130 ml of oil and 760 g R134a

porcho heat

I have a semi-related question

If I evacuate my system on my 83 944, fix leaks and etc.. I can refil with R134a without changing anything?

Mike951

thanks

Zero10

porcho heat,
Yes technically you can. Best idea would be to empty the compressor, condensor, and all accessible lines of all oil (by pouring it out), and change any accessible O-rings as a preventative measure. Also, you should change the receiver/dryer every time you do any major work on the system, as the dessicant eventually gets depleted, and it collects a lot of oil as well.

So, for $20 for a recevier/dryer, and $10 in misc A/C O-rings, you can just re-fill it with R134A

83na944

porcho heat is correct. The only thing you really need to change is the drier and any O-rings (be sure to get the right ones for R134a). You really should drain the oil from the compressor and put the same amount of POE oil in there. And the same amount of POE oil that you drain out of the drier.

You will also need a couple of R12 to R134a fittings. When I converted my 83 944 to R134a, I used an "L" shaped fitting on the compressor. This was the only way I could fit a hose in that tight space.

Another trick to ease access to the compressor port, which is where you have to charge the refrigerant on an 83, is to use slightly shorter belt. This rotates the compressor toward the center of the car so that the top of the compressor clears the alternator. Someone posted this info about a 12 to 18 months ago here. If you search on my name and NAPA you should find it with a little other stuff.

Good Luck.