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Car Forum / Mercedes-Benz Cars / May 2009mercedes or GM ac compressor
Hi, My 1984 300SD needs a new ac compressor. My last mechanic said mercedes compressors were junk and GM's were better. I'm running R12 in the AC. I've read in past posts that Mercedes ones are better because they are oriented correctly. Any opinions? Also, what is the correct amount of oil and freon for this car? Thanks, Jeff I buy my compressor on ebay... save a ton of money. Here is one... brand new... not rebuilt for $180 shipped. http://cgi.ebay.com/ebaymotors/77-93-Mercedes-Benz-190-240-300-Series-AC-Compres sor_W0QQcmdZViewItemQQ_trkparmsZ72Q3a1171Q7c66Q3a4Q7c65Q3a12Q7c39Q3a1Q7c240Q3a13 18Q7c301Q3a0Q7c293Q3a1Q7c294Q3a200QQ_trksidZp3286Q2ec0Q2em14QQhashZitem3a4e20d9d 9QQitemZ250418878937QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories Mercedes R4 is the same Delco R4 used in GM... there is no difference between the two. The only thing might be different is the clutch and the wiring but it does not seems for strictly for the R4. For the other Nippondenso, the difference is the wiring harness which some mechanic spliced it to make it fit... and the clutch is definitely different. I usually buy from the guy who has red picture but he doesn't have R4... Tiger, Thanks a million for the link to ebay. The other place I found was techchoiceparts. They had a new compressor for 180. Thanks again and everyone stay cool this summer. Jeff Tiger, Who's the guy with the red picture? Jeff Don't just buy any compressor just because it is new. I bought one that was new, but not a AC Delco and it didn't last very long and was nothing but trouble. I just had a new compressor, AC-Delco, put on and I paid the AC shop in Las Vegas $430 for the part. I looked around on-line for one but I couldn't find an AC Delco one new. That's the make of compressor that was on my car when I bought it. I don't know if it had been replaced or not, but I doubt it because the car was mostly used in Seattle, where you don't use AC much. I have driven though Death Valley and this week to Venice Beach and back and the new AC setup has worked just like when the car was new. I had them put R-12 (freon) in because that is the coolant the system was designed to use. We tried 134a once, but it didn't cool well enough. I replaced the evaporator and condenser last season. http://cgi.ebay.com/ebaymotors/85-93-Mercedes-190E-260E-300E-A-C-COMPRESSOR-NEW- KIT_W0QQcmdZViewItemQQ_trkparmsZ72Q3a1171Q7c66Q3a4Q7c65Q3a12Q7c39Q3a1Q7c240Q3a13 18Q7c301Q3a1Q7c293Q3a1Q7c294Q3a200QQ_trksidZp3286Q2ec0Q2em14QQhashZitem3351389af eQQitemZ220405996286QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories He has red pictures... on ebay that is. I bought two compressors from him. > Mercedes R4 is the same Delco R4 used in GM... there is no difference > between the two. The only thing might be different is the clutch and the > wiring but it does not seems for strictly for the R4. The Mercedes compressor is bottom mounted. There is a passage that allows oil to get into the bearings. The proper orientation is marked with an X. The Delcos are apparently usually top mounted so that when used on the Mercedes, the compressor is upside down and oil won't flow into bearings under gravity. Many have used GM compressors on MBs with good results - presumably enough oil splashes around to lubricate the bearings but perhaps the compressor life may be affected. Here is an old post on the subject by the late Dr. Marshall Booth (an MB diesel expert!): http://www.mail-archive.com/mercedes@okiebenz.com/msg57091.html CN > The Mercedes compressor is bottom mounted. There is a passage that allows > oil to get into the bearings. The proper orientation is marked with an X. [quoted text clipped - 5 lines] > oil splashes around to lubricate the bearings but perhaps the compressor > life may be affected. Carnut... thank you for your information. That is critical information and may be the only reason why some of those R4 don't last long. |
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