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  #1  
Old 05-30-2003, 09:02 PM
conanh
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How to replace an A/C Compressor 240D

I have just bought a compressor for my 83 240D I was thinking about having some one do it but he is going to charge me $150 is replacing the compressor easy Im also having to replace the condinser that looks easy but the compressor looks hard. The compressor is an R4 on the lower left side of the engine can any one tell me what it all involves replacing this compressor.

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  #2  
Old 05-30-2003, 09:18 PM
engatwork's Avatar
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Location: Soperton, Ga. USA
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Pretty straight forward

Look at the back of the compressor. You will see three 19mm hex head fasteners. Loosen all three of them. I have found that a long 19mm box end works good. You can get to the two bottom ones from under the car and should be able to get to the uppermost one from above the car. You will also see a 15mm hex head fastener holding the hose "manifold" to the compressor with another 13mm hex fastener supporting some of the weight of the manifold. Loosen these before you get the 19mm fasteners out. Now that you have started loosening the 19mm fasteners you will want to back the belt tensioner fastener that pulls the compressor to put tension on the v-belt. Loosen this one pretty much all the way. Once you have backed it off you should be able to remove the v-belt. Go ahead and finish removing the hose manifold fasteners and then take out the 19mm fasteners. Capture and remember where the different size spacers go. You should now be able to remove the compressor from underneath the car. It does have a little weight to it so you will want to be holding it securely when you remove the last 19mm bolt. Pay attention to what kinds of gaskets are between the hose manifold and the compressor. You will want to put new ones here. Your new compressor may have a different type so you will want to make sure you use the right ones. You are going to want to get approximately 2 ounces of oil in the compressor. The way I do it is to lay the compressor face down, pour oil in both of the holes and turn the compressor where the internals are turning. Add some more oil and repeat. Do this a couple/few times until you have put about 2 ounces of oil in it. If you overfill during this procedure it will just spill out a little when you bolt it up. Anyway start putting everything back together. Position the compressor into place and try to get the 19mm fasteners started. When you have them going you should be able to bolt up the hose manifold. Don't forget to put the seals in place and I always use some Nylog on the seals. Tighten the hose manifold fasteners and then slip the v-belt over the pulleys, pull it tight and tighen everything down. If you are just doing your compressor you will want to measure the amount of oil that you pour out of it and then just add the same amount. Getting the correct amount of oil in there may be the hardest part of your whole job.
Are you going to vacuum/charge the system yourself or have someone do it? Are you sticking with R12 or going to 134?
good luck
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  #3  
Old 05-30-2003, 09:33 PM
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I just replaced mine in the '84 300D last weekend.

Save the freon - but of course.

Loosen the adjusting nut and the two bolts that secure the compressor and the really hard to get at bolt that holds it on to the engine. Rotate it on the third bolt to get the belt off.

Then you will remove the two bolts that secure it from rotating. Watch out for the large washers..
Put a pan under the compressor to catch the oil and remove the fitting that holds the hoses to the compressor.

If its original you might find washers that have integrated O rings. Take them off if your new compressor has the O Rings on it.

Remove the last, really hard to get at, bolt and off it comes.

Now the decision: Do you want to pump the new oil into the compressor or do you want to pour it in first?

If you want to pour the oil in while its off the car, then you will need to remove the hoses and attach them to the compressor after you fill it with the proper oil - (mineral if R12 (heaven forbid) or ester oil if R134 and others but I don't know about R4(check with an HVAC guy))... - This will make reinstallation more difficult with those hoses hanging around... Then in goes the freon and off you go...

If you want to pump the oil in just attach the new compressor to the car in reverse of the installation, pump in the oil and then the freon. Burrrrr

Good luck!
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1995 E320 - 115kmi+ Smoke Silver/Cream (Wife's Wagon)
1989 260E - 195kmi+ Black/Grey (My Panther)
1984 300D - 242kmi+ Black/Palomino (Retired)
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  #4  
Old 05-30-2003, 09:36 PM
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I love it when two people answer at once. Just goes to show ya that this forum is well attended.

Listen to engatwork. He understands it better than I do.

Good luck again!
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1995 E320 - 115kmi+ Smoke Silver/Cream (Wife's Wagon)
1989 260E - 195kmi+ Black/Grey (My Panther)
1984 300D - 242kmi+ Black/Palomino (Retired)
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  #5  
Old 05-30-2003, 10:26 PM
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Location: central Texas
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Why are you replacing your compressor ?
Why are you replacing your condenser ?

You asked a very specific question.. and got specific answers based on recent experience....

However, I am worried about the bigger picture... since you do not mention replacing the Reciever/Dryer , possibly needing to flush the system due to the reason you needed a new compressor....

Since you do not sound like you have the specialized tools /experience to do this... you may be better off having that machanic you mentioned do this job... as I am assuming he was including these almost de rigueur* items in his labor estimate.


------------------------------------------------------------
*de rigueur

\De ri`gueur"\ [F. See 2d Rigor.] According to strictness (of etiquette, rule, or the like); obligatory; strictly required.
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and yes,,, I understand that the combination of " almost" and 'de rigueur" together is an oxymoron *.
-------------------------------------------------------

*ox·y·mo·ron ( P ) Pronunciation Key (ks-môrn, -mr-)
n. pl. ox·y·mo·ra (-môr, -mr) or ox·y·mo·rons
A rhetorical figure in which incongruous or contradictory terms are combined, as in a deafening silence and a mournful optimist.
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  #6  
Old 05-30-2003, 11:05 PM
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A/C problems

conanh,

You should be very careful in removing the old compressor since venting freon 12 into the attmosphere is punishable by a $10,000.00 fine. If a neighbor sees you doing it and reports you, he/she gets a $5,000.00 reward. The enviromental wackos are very serious. Be cautious, maybe take it to a shop and have them evcauate the system before tinkering.

Ben
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  #7  
Old 05-30-2003, 11:09 PM
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Ben, Not to mention FrostBite.... and I am not kidding... this is the same process that some cancers are taken off the skin by... and is very painful afterwards...
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  #8  
Old 05-30-2003, 11:37 PM
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Ice Cold

leathermang,

Now you tell me. Been there done that and could have turned my doctor in for $5,000.00. I'd have called that "Medicare", big time.

Ben
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  #9  
Old 05-31-2003, 08:05 AM
conanh
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The tubing going into my condenser broke off and my compressor locked up. Im also going to replace my dryer and im going to have a frend vacume and charge the system with 134. By the way where is the expantion valve and what does this one look like.
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  #10  
Old 05-31-2003, 08:18 AM
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Location: central Texas
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You are new to the board so it is not surprising that you have not found our excellant search engine feature... for instance... here is a thread which talks about flushing... and has a picture posted by me of the expansion valve location...

A/C Failure - How to Diagnose?
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  #11  
Old 05-31-2003, 08:50 AM
LarryBible
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Ridge,

The fine is $25,000.

Conan,

After internal compressor failure it is IMPERATIVE that you flush the ENTIRE system to remove the debris left over from the failure. If you don't, your new compressor will FAIL, period.

The priced quoted for replacing the compressor sounds like it is ONLY for replacing the compressor. Make sure the system is flushed THOROUGHLY, or you will have the opportunity to replace the compressor a second time.

Good luck,
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  #12  
Old 05-31-2003, 10:16 AM
rebootit
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I think the expansion valve on this setup as it sounds just like the way my 300d is set up is a little square looking thing under the dash by the evaporator. Since the system blew open I would change it out as well cause they have tiny holes and will plug up, rust, etc.
I guess I got lucky with my 77 240d with the York compressor, what an easy thing to R&R if needed

Also that 10k fine think sounds like BS to me. A shop doing it yes, your neighbor claiming you did it? Prove it. My system was M-T before I started the work. Show me the gas I let loose
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  #13  
Old 05-31-2003, 10:21 AM
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If there is any possibility stuff got into your system... either from a former compressor giving up, a former Reciever/dryer losing its bag of dessicant , or the system open for a while... the books certainly recommend replacing the Expansion Valve... only about $35 typically... so cheap insurance in my book...
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  #14  
Old 05-31-2003, 08:13 PM
LarryBible
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rebootit,

It's not a $10,000 fine, it's $25,000. It's very clearly laid out in the EPA test material.

That said, as with any crime you have to be caught in the act or otherwise have clear evidence for prosecution.

For an individual it would be difficult to be caught. It would not be so difficult for a shop to be caught because records are supposed to be kept of each vehicle serviced, amount of refrigerant recovered or recycled, etc.

Have a great day,
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  #15  
Old 05-31-2003, 10:03 PM
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Location: central Texas
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Hey, Yall quit getting Larry stirred up.... Don't mix R12 with anything.. and don't vent it to the atmosphere... and change your engine oil when it is hot and just loosen your oil lines.. don't take them all the way loose.....

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