There is nothing that will mix & will work as a refrigerant. Based on your tests, I'd say that your friend's system is low. There is no way of knowing how fast R12 will leak out without dumping a can in. One good sign is that fact that he has some refrigerant in his system. Has his AC been down for a while? More than a month? If so than he does not have a major leak and it's safe to dump in a can. If he had a major leak then you would not have any charge left by now.
Thanks, Tom Hargrave 256-656-1924 www.kegkits.com -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Dave M. Sent: Monday, July 04, 2005 11:19 PM To: [EMAIL PROTECTED] Subject: [MBZ] What to use as test refrigerant on R-12 system Hi all, My friend has a W124 with no A/C. I pressed the schrader valve and there is still some pressure in the system, so it's not empty. I shorted the low pressure switch and the compressor runs, and there are bubbles (or something) visible in the sight glass. I did not have my manifold gauges with me to test pressures. I assume the system is low on R-12 at the moment. I hate to feed it precious R-12 just to have it leak out. I don't have a vacuum pump, so I really don't want to open the system. Is there anything I can feed in that will be compatible with R-12 (and cheap1), or am I stuck either taking the gamble (add R-12) or having to discharge, vacuum, and re-fill with a mineral-oil compatible replacement like Duracool, AutoFrost, or good 'ol R-12? He's on a tight (read: zero) budget but sure would like some cool air if possible. Suggestions welcome... :-) -- Dave M. Boise, ID 1994 E500 - 94kmi (Q-ship) 1987 300D - 256kmi (Sportline) _______________________________________ For used parts email [EMAIL PROTECTED] For new parts see www.buymbparts.com For repairs see www.oldworldauto.com To Unsubscribe or change delivery options go to: http://striplin.net/mailman/listinfo/mercedes_striplin.net
