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  #16  
Old 09-27-2011, 08:15 AM
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TEX599 , are you going to flush the system to clean out any potential burned oil caused by the compressor failing ?
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  #17  
Old 09-27-2011, 09:37 AM
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yeah, this is a good point.
since there is no freon in there now anyway, and your compressor is grinding, thus debris is in the system, at a minimum, you need to reverse flush your lines, and the condenser using an a/c flush agent, and dry nitrogen. get a new reciever, and if it were me, I'd also convert the expansion valve into a flush tool to flush out the evaporator as well, then install a new expansion valve. that way, you can use the PROPER oil for the refrigerant you choose to install, and charge it up right!
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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  #18  
Old 09-27-2011, 09:50 AM
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Quote:
Originally Posted by vstech View Post
.... and if it were me, I'd also convert the expansion valve into a flush tool to flush out the evaporator as well, then install a new expansion valve. ....
If you did that with the expansion valve you would be following the Mercedes AC Factory Shop Manual.... always a safe plan...
The other stuff is of course right on the money also for longevity.
If this is the R4 compressor the manual says the manifold needs to be renewed. Seems it can not be flushed properly in case of compressor failure.
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  #19  
Old 09-27-2011, 10:18 AM
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It is the R4 compressor and I do plan to replace dryer, was not sure about the expansion valve. System was completely rebuilt in 2008 with new everything. I was going to have the shop that will fill the system do the flush. How hard is it to flush, I know you can by the flush at the parts store? If I do the flush, can I also fill the system with R134a? Anyone have experience on this?
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  #20  
Old 09-27-2011, 10:22 AM
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flush is a cleaning prep step for the new compressor.
it's a small step, that requires completely blowing out ALL residue/oil/flush chemical from the lines with dry nitrogen.
once this is complete, all the o-rings in the car need to be replaced, then the oil, and compressor and reciever get installed, and pressureized with nitrogen to verify it's leak free. then that needs to be removed, and the system totally evacuated and THEN the system gets charged with refrigerant.
R12 would be my choice of refrigerant though.
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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  #21  
Old 09-27-2011, 11:39 AM
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Originally Posted by leathermang View Post
If this is the R4 compressor the manual says the manifold needs to be renewed. Seems it can not be flushed properly in case of compressor failure.
You mean this:




Clean that sucker out...

Pic shows 134a valve with the red top on it and the r12 valve on the top tube.

If you have r12 for sure I'd stick with it. Consensus seems to be that R4 compressors are marginal running with r12 pressures and r134a operating pressures are higher. Oil is another thing. R4's may not agree with the oils r134a require plus r134a will leak out of the old hoses faster than r12.



If your compressor threw debris through the system you may be in for a job. Not an impossible job, not really that hard, just kind of tedious.
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  #22  
Old 09-27-2011, 11:52 AM
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Yes, that one.
Someone was going to send me an old one and me cut it apart to see if we could determine if there was some screen hidden in there which can not be cleaned properly... thus the instructions in the MB AC manual to REPLACE IT ....
The impression that R4 running R12 were marginal only comes from you hanging around a group of people who have cars with 200k PLUS miles on them and often cars which they have no idea what kind of idiot serviced them in the decades before they owned them.
MILLIONS of R4's worked great with R12 ....
I do not know if ' TEX' is from Texas... but if he is then R12 is the highly recommended refrigerant running Castrol premium cold flow oil of the proper amount. Cleaning the system properly is of extreme importance if you want it to last... and cool...

VStech, where did the super AC sticky thread go ? Are you condensing and finalizing it now... since you have plenty of time with no huge time sensitive projects in your life..like getting rid of 75 cars which accidentally followed you home over the years....
It is still hot in Texas....LOL
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  #23  
Old 09-27-2011, 12:55 PM
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I unstuck it for the fall.
I'll clean it up and make a nice first post and send it back up top in the spring.
of course it's still hot in TX... does it EVER get really cooled off in TX?
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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  #24  
Old 09-27-2011, 01:23 PM
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Maybe this is why they said replace it:

Bushehr reactor #6 inlet - YouTube

This is mine taken off a functioning system that had been converted to 134a. Compressor clutch went bad.

I ran a wire through both tubes and didn't feel a filter.

Here's my receiver:



You'll want to replace it as well.

Perhaps "marginal" was too strong a term but the overall design makes them oil charge sensitive because they have no sump to store oil.

I would be scared to run another one on 134a.
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  #25  
Old 09-27-2011, 01:43 PM
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Originally Posted by 1980sd View Post
Maybe this is why they said replace it:

Bushehr reactor #6 inlet - YouTube
UGH!
that's just nasty!
imagine all those scabs flaking off with fresh oil and refrigerant, and flowing through your system!
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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  #26  
Old 09-27-2011, 02:33 PM
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Originally Posted by vstech View Post
UGH!
that's just nasty!
imagine all those scabs flaking off with fresh oil and refrigerant, and flowing through your system!
Most of it looked like corrosion although I think I saw some particulate
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  #27  
Old 09-27-2011, 06:41 PM
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Originally Posted by vstech View Post
I unstuck it for the fall.
I'll clean it up and make a nice first post and send it back up top in the spring.
of course it's still hot in TX... does it EVER get really cooled off in TX?
120 days in row over 90 degrees
87 over 100 days . Record by about 20 days.
no rain for four months....
Hottest average temperature for the summer Ever ... 150 years of recording...
Aug hottest month on record.
I am in the county which had the 1500 homes burn on 35,000 acres...

It just seems like TEX599 might could have done some research in that thread if it were available... and some people wait till reasonable weather to tackle their AC systems ....
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  #28  
Old 09-27-2011, 10:00 PM
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Originally Posted by leathermang View Post
120 days in row over 90 degrees
87 over 100 days . Record by about 20 days.
no rain for four months....
Hottest average temperature for the summer Ever ... 150 years of recording...
Aug hottest month on record.
I am in the county which had the 1500 homes burn on 35,000 acres...

It just seems like TEX599 might could have done some research in that thread if it were available... and some people wait till reasonable weather to tackle their AC systems ....
It's also a safety issue. The defroster works extremely well when the AC is working.
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1980 300SD
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  #29  
Old 09-27-2011, 10:40 PM
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Quote:
Originally Posted by leathermang View Post
120 days in row over 90 degrees
87 over 100 days . Record by about 20 days.
no rain for four months....
Hottest average temperature for the summer Ever ... 150 years of recording...
Aug hottest month on record.
I am in the county which had the 1500 homes burn on 35,000 acres...

It just seems like TEX599 might could have done some research in that thread if it were available... and some people wait till reasonable weather to tackle their AC systems ....
the thread is still there, just not stuck.
anybody can bump it up to the top. I figured it was not getting much attention. heh, maybe I should post a poll to stick it or not... that didn't sound right...
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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  #30  
Old 09-27-2011, 10:46 PM
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Originally Posted by 1980sd View Post
It's also a safety issue. The defroster works extremely well when the AC is working.
Evidence my brain is fried... I knew that and yet had to read it four times to understand what you were saying..

for others not intimate with your dash workings...

When you turn on the Defroster.... your car turns on the AC also ( if it is functional )... it routes both fresh air and recirculated cabin air through the AC cooling fins first... dropping out the moisture.... then to the heating coils of the heater and is directed to the inside of the windshield to keep it from fogging over.
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