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#1
08-28-2010, 07:24 AM
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Thanks for your response.
I pulled a vacuum on the car's a/c system and immediately set the unit to charge it with virgin R134. Seven ounces were sucked in rather quickly, then nothing. The virgin cylinder seemed to be heated pretty good. I don't know how hot it should get before the pressure is high enough. The manual says it could take 10 minutes, but it was longer than that. The car's compressor doesn't seem to be turning on. The clutch certainly isn't turning, but I can turn it by hand. Does the car's compressor need to be running in order to draw in more of the refrigerant? If so, how do I get it to run? 
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#2
08-28-2010, 10:42 AM
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I vacuumed and tried to charge the system again. The low side reads 105 and the high side is 110. The compressor is still not on. Six ounces of refrigerant were sucked into the system before it stopped. Any ideas?
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#3
08-28-2010, 10:48 AM
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search posts by larry bible.... he seems to know the systems...
there's a way to jump the a/c compressor to have it start up....
__________________
1989 300ce 129k ( facelifted front,updated tail lights, lowered suspension,bilstein sports, lorinser front spoiler, MOMO steering wheel, remus exhaust,stainless steel brake lines). (Gone) 1997 s320 154k (what a ride). Sold with 179k miles. Replaced with Hyundai Equus 1994 e320 Cabriolet 108k  1972 280se 4.5 153k Owned for 12 yrs, sorry I sold it [/SIGPIC]
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#4
08-28-2010, 10:52 AM
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from mb doc:
if you remove the klima & use a jumper wire between circuit 15(power) & 87(compressor) the compressor has to run.... Those circuits are marked on the relay..& are marked 5 & 7 on the electrical connector. That test will allow you to decide if the compressor is good or if you are having "klima" control problems. __________________
__________________
1989 300ce 129k ( facelifted front,updated tail lights, lowered suspension,bilstein sports, lorinser front spoiler, MOMO steering wheel, remus exhaust,stainless steel brake lines). (Gone) 1997 s320 154k (what a ride). Sold with 179k miles. Replaced with Hyundai Equus 1994 e320 Cabriolet 108k 1972 280se 4.5 153k Owned for 12 yrs, sorry I sold it [/SIGPIC]
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#5
08-28-2010, 11:10 AM
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Thanks Lee. I was just doing that when I came in and saw your post. I jumped the pressure switch and the compressor turns on and the clutch engages. However, there still seems to be a pressure gradient. Maybe now that I know how to turn on the compressor I should evacuate the system, pull a vaccum and try to charge it again.
Oh, and I've read so many related a/c posts that my head hurts.
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#6
08-28-2010, 11:38 AM
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There's still a problem with the pressure as the "pressurizing tank" light on the a/c recovery/recharge unit continues flashing. The refrigerant is just not getting drawn into the car's a/c system. I didn't perform another evacuate and vacuum cycle after I got the car's compressor to turn on. I don't know if that's where my problem is.
So far only 8 ounces of refrigerant have gone in. I don't want to run the car's compressor too long without a sufficient charge. Does anyone have any other recommendations?
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#7
08-28-2010, 11:44 AM
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what kind of air do you have when you run the compressor.....??? cool? i think the systems don't take much more than a can and a half or so..
i don't want to lead you down the wrong path...but wondering if you have a stuck expansion valve.
__________________
1989 300ce 129k ( facelifted front,updated tail lights, lowered suspension,bilstein sports, lorinser front spoiler, MOMO steering wheel, remus exhaust,stainless steel brake lines). (Gone) 1997 s320 154k (what a ride). Sold with 179k miles. Replaced with Hyundai Equus 1994 e320 Cabriolet 108k 1972 280se 4.5 153k Owned for 12 yrs, sorry I sold it [/SIGPIC]
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