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  #1  
Old 08-23-2006, 09:38 AM
Mookie32
 
Join Date: Aug 2006
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How to tell if your AC compressor is bad?

I've got a mechanic telling me my AC compresser and evaperator/dryer are bad and need to be replaced. I bought the car off Ebay and the AC worked for about 300 miles.
I've purchased a 'parts car' of the same year and modle and I was going to take the compressor and dryer off of it. The engine on the parts car doesn't run and when it did, the former owner said he wasn't getting any cold air off of it. So, without knowing how to tell if the AC compressor is working, I don't know if it's worth the time and effort to take the part off the 'parts car' other than hoping it works and saving about $400 in AC parts.
(It's about another $300 to $400 for labor and freon.)
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  #2  
Old 08-23-2006, 09:43 AM
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What flavor of car are your writing about?
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  #3  
Old 08-23-2006, 09:51 AM
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A compressor can still operate even with leaking seals. Make the mechanic tell you what is wrong. It is standard practice to replace the dryer along with the compressor. In a perfect world, the dryer should be replaced any time the A/C system is opened.

Do not use a used dryer. They are usually $50 or less. Cheap insurance. A plugged dryer will cause the system to not function, or worse.
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  #4  
Old 08-23-2006, 10:04 AM
Mookie32
 
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HeyTX76513,

I'm working on a 1985 300SD Turbo Diesel.
menu_register("postmenu_1254646", true);
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  #5  
Old 08-23-2006, 10:08 AM
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not a foolproof test but....

put your hands on the compressor and turn the metal center part, usually with three angle parts forming a triangle.
if it is free, at least you know the compressor is not siezed up.
John
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  #6  
Old 08-23-2006, 10:12 AM
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Quote:
Originally Posted by mookie32 View Post
HeyTX76513,

I'm working on a 1985 300SD Turbo Diesel.
menu_register("postmenu_1254646", true);
PM me your email address and I will send you the 21 page pdf document to test every component on your 85SD ACC. Don't get overwhelmed with the amount of information, but it's a good idea to become familiar with the beast. ACC can be a real bummer as you probably have read many threads on the subject. With that said, once you get the idea of how everything works there not that bad. There are plenty of pictures to help you identify components
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Last edited by TX76513; 08-23-2006 at 10:45 AM.
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  #7  
Old 08-23-2006, 11:00 AM
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Quote:
Originally Posted by TX76513 View Post
PM me your email address and I will send you the 21 page pdf document to test every component on your 85SD ACC. Don't get overwhelmed with the amount of information, but it's a good idea to become familiar with the beast. ACC can be a real bummer as you probably have read many threads on the subject. With that said, once you get the idea of how everything works there not that bad. There are plenty of pictures to help you identify components


I'll drop ya a PM too, my '85s will be gettin' fixed this weekend hopefully.
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  #8  
Old 08-23-2006, 11:26 AM
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Quote:
Originally Posted by mookie32 View Post
I don't know if it's worth the time and effort to take the part off the 'parts car' other than hoping it works and saving about $400 in AC parts.
(It's about another $300 to $400 for labor and freon.)
Given the cost of labor and freon, it just isn't worth it to fool around with salvage parts. The drier is not reuseable, anyway. You can buy a new compressor for around $200.

Saving money on A/C repairs usually turns out to be an expensive proposition.
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  #9  
Old 08-23-2006, 11:33 AM
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Napa Auto has the R4 version which I think is whats on that car for 130 bucks. Its a reman but for the price you get a warranty. A cheap option but way better than junk yard ac parts.
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  #10  
Old 08-24-2006, 11:09 AM
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Quote:
Originally Posted by Endust View Post
Napa Auto has the R4 version which I think is whats on that car for 130 bucks. Its a reman but for the price you get a warranty. A cheap option but way better than junk yard ac parts.
Do you know the p/n and would that fit my 75 240D?
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  #11  
Old 08-24-2006, 11:20 AM
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I dont have a clue whats on the 1975 but Its prolly the older Sanden one. That one looks like a bilge pump sitting on the pass ide of the engine. The R4 look slike a doughnut.
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  #12  
Old 08-24-2006, 11:31 AM
18 year old benz newbie
 
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not that mine works (spins freely, but i think it doesnt work) my 76 300d has a york compressor
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  #13  
Old 08-24-2006, 11:51 AM
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Originally Posted by Rudolphrocks View Post
Do you know the p/n and would that fit my 75 240D?
Unless it's been retrofitted, a '75 240D will be equipped with a York recriprocating compressor. A retrofitted car would have a rotary Sanden.
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  #14  
Old 08-25-2006, 09:33 AM
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Quote:
Originally Posted by TX76513 View Post
PM me your email address and I will send you the 21 page pdf document to test every component on your 85SD ACC. Don't get overwhelmed with the amount of information, but it's a good idea to become familiar with the beast. ACC can be a real bummer as you probably have read many threads on the subject. With that said, once you get the idea of how everything works there not that bad. There are plenty of pictures to help you identify components
TX, can I get in on that offer also? It will be appreciated.

Thanks,

Padraig
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  #15  
Old 08-25-2006, 09:44 AM
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Quote:
Originally Posted by Padraig View Post
TX, can I get in on that offer also? It will be appreciated.

Thanks,

Padraig
Sent
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12 VW Bora TDI
86 Holden Jackaroo Turbo D
86 300SDL
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Old 08-25-2006, 09:44 AM
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