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  #1  
Old 06-01-2004, 11:08 PM
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Join Date: Aug 2002
Location: oregon
Posts: 135
expansion valve o-rings

I have been replacing parts with the a/c in prep to get recharged with r-12. During the winter, my a/c compressor seized and began my venture. I have installed a replacement compressor, new receiver dryer, and finally an expansion valve.

I stopped at MB dealership today to pick up a set of seals that did not come with my original parts order. The counter parts guy was not the most experienced and his computer listed 4 o-rings and put together a set of these. The set he gave me had 4 different sizes:

small
slightly larger
a hair just under large
and a large

All fit except for the large which the opening that I tried it on appears to be another "hair just under large".

Did they give me the wrong size or somehow should there be four different? I want this thing sealed up well before I have someone purge and refill with $r-12$.

Thanks.
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Whoever dies with the most toys......Wins!

1984 300d
165k miles
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  #2  
Old 06-02-2004, 07:18 AM
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Join Date: Sep 2001
Location: central Texas
Posts: 17,277
Do you mind sharing the year/model/and type compressor you have with us ? Only one of us is Sylvia Brown Psychic....
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  #3  
Old 06-02-2004, 08:19 AM
LarryBible
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Greg,

Which one of us is Sylvia Brown? I know it's not me, I flunked the mind reading test when I joined Mshop, but they let me register anyway.

pdxman,

Did you THOROUGHLY and COMPLETELY flush the ENTIRE system after your compressor failure? If not, you will be replacing your new compressor again VERY shortly.

If this is a 123 car I think there are only two sizes, but it's been awhile since I had one apart. We have no way of answering your question without knowing what year and model MB that you are working on.

Good luck,
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  #4  
Old 06-02-2004, 08:52 AM
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Join Date: Aug 2002
Location: oregon
Posts: 135
OOps! I applied my car (84 300d) to my profile so it won't happen again.

Larry, I have not hooked the belt up to my compressor. I will let the Inde shop do that AFTER they flush the system first or however they do so. They did say they would clean/leak test before filling with R-12. They also wanted to make sure that the evaporator was not at fault before putting in r-12 as there were no obvious leaks when I originaly showed to them. When I took the passenger kick panel off to replace the expansion valve, that is where i found the obvious leak. The foam surrounding it was soaked with oil and looked like a fitting failure occurred.

Thanks.
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Whoever dies with the most toys......Wins!

1984 300d
165k miles
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  #5  
Old 06-02-2004, 09:13 AM
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Join Date: Sep 2001
Location: central Texas
Posts: 17,277
Not me either , or I would have just answered it to show off.... I meant, if she is a member then she is the only one which would not need that info.... LOL... I could have said Uri Geller, but too many young people would have missed the joke...

I notice that you put a new compressor on.. which is always nice when one can afford it... was the only indication of the reason the ac was not working that it was low on Refrig and you found that leak ? In other words, do you think the safety systems which are supposed to protect the compressor worked.... or that you also had catastrophic compressor failure ?
If that is the case you may need to replace some of the lines or manifold... I just read in the AC MB manual that some parts are considered NOT FLUSHABLE (rephrase:not cleanable by flushing ).... I am on the way to appt.. will check and post about this when I get back...

Disclaimer, I do not believe in Psychics ( until more evidence is submitted )... Do not do this at home, or while under the influence of Diesel Fumes.....
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  #6  
Old 06-02-2004, 10:27 AM
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Join Date: Aug 2002
Location: oregon
Posts: 135
No, the reason I found out my a/c wasn't working in the winter is that my car was shudderring at idle. I thought of other reasons for causing this other than the a/c compressor. Shortly after came the screaching and eventual breakage of the a/c belt caused by the stress from a seized compressor. Once the belt blew, the engine smoothed out due to it not having to work so hard turning the compressor pulley.

In a nutshell, the compressor was toast. Not sure if this was the cause or result of another failure. I do know that when I took it into the shop it had completely leaked all r-12.

The a/c blew nice and cold last summer and early fall, so I believe the leak was maybe sudden and not gradual. The compressor was replaced about 5 years ago as well as the other componants as I gathered from record history.

Could the expansion valve leak have caused the compressor failure or would it be more of vice-versa?
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Whoever dies with the most toys......Wins!

1984 300d
165k miles
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  #7  
Old 06-02-2004, 02:52 PM
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Join Date: Sep 2001
Location: central Texas
Posts: 17,277
I think you need to really look at your system before you get it or put it back together yourself...
I think that it leaked out the R12... and that your backup systems which should have protected the compressor failed to operate correctly...
Thus you lost the compressor instead of just the R12...
Some compressors have a supreheat switch on them... plus the high/low pressure switch on the R/D....
I would SURE hate for you to lose a NEW compressor due to your backups failing again.... A really sickening thought...
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  #8  
Old 06-02-2004, 04:34 PM
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Join Date: Aug 2002
Location: oregon
Posts: 135
Thanks Leather...What suggestions do you have then since I've replaced the r/d, exp valve, compressor, have a new belt, new o-rings etc????

I thought I pretty much covered everything already and won't tackle the evaporator unless it is proven to be at issue.
__________________
Whoever dies with the most toys......Wins!

1984 300d
165k miles
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  #9  
Old 06-02-2004, 07:44 PM
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Join Date: Sep 2001
Location: central Texas
Posts: 17,277
Your high ( and particularly LOW ) pressure switch. This should have cut out the compressor when the pressure got low from the leak..... and perhaps someone direct wired it , bypassed it, failed to check the low pressure side of it.... etc...
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