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Converting Mercedes to R134a

fastshivy on Sat June 26, 2010 6:16 PM User is offline

Year: 1988
Make: Mercedes
Model: 560SL
Engine Size: 5.6
Refrigerant Type: r-12
Ambient Temp: 90
Country of Origin: United States

My 1988 Mercedes has suffered black death. I would like to convert it to 134a Does anyone make a compressor specific for this application? i:e a new compressor that will fit and is r134a specific ......Not sure what to do at this point.....originality is not a big concern.
I have worked on a few other cars and this system looks a little different?? Any suggestions please

TRB on Sat June 26, 2010 8:56 PM User is offlineView users profile

My suggestion is to stay with R12 as your refrigerant. Not do you a compressor being R134a or not. More so these cool on the poor side to begin with and think it best to stay R12 with them.

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iceman2555 on Sat June 26, 2010 11:08 PM User is offlineView users profile

2nd suggestion to stay with R12.
Wonder what has been added to this system for the 'black death' issue. The compressor used on this vehicle is not normally associated with a 'black death' issue. Has someone being 'playing' around with the system...adding a extra chem or two?
If you truly have the 'black death' issue with this vehicle...get ready for some serious labor and repair time. The evap needs to be flushed and clean completely. This involves the removal of the TXV. Some MB have an access for the TXV, others require the removal of the evap. MMMMM....lots of labor.....serious job. But if this system is not thoroughly cleaned...and the 'black death' issue is valid.....the system will continue to fail...over and over...and over.
Get the system cleaned.....absolutely clean.....stay with 12 and you should have a successful repair.
Good Luck !!

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The strongest reason for the people to retain the right to keep and bear arms is, as a last resort, to protect themselves against tyranny in government.
Thomas Jefferson

bohica2xo on Sun June 27, 2010 2:58 AM User is offline

That car should stay R12.

"A little different"? Um, yeah.

The engine bay was so tight on that car the underhood airflow was poor. Underrhood temps were awful. There is a recuperator in the refrigeration suction line that cools the fuel . Otherwise the gasoline tended to boil...

Possibly the worst vehicle choice ever to try to convert to 134a.

B.

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"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest."
~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446.

fastshivy on Sun June 27, 2010 3:29 PM User is offline

fastshivy on Sun June 27, 2010 3:47 PM User is offline

sorry for the above bad. Glad i asked!... just bought the car and found old repair bills for the AC. The fellow that owned it passed on to a new life. The car has been worked on at least 4 times.. new hose twice, new clutch, new evaporator. The compressor froze up and someone took the belt off or it burned off...who knows. The part that looked funky were the lines going near the throttle body...thanks for the explanation above. I do not have easy access to R12 or the manifold gauges (all my stuff is for R134) that is why I wanted to change it over. Perhaps I can do most of the work and find someone to charge the system. I am very mechanically minded, but a little rusty and did very little AC work. I really appreciate you guys steering me out of trouble.

bohica2xo on Sun June 27, 2010 4:04 PM User is offline

Yes, that little heat exchanger in the suction line does look a bit odd. A gasoline cooler is certainly not mainstream equipment.

Compressors fail. Usually most of the junk winds up in the condensor & receiver/dryer. Best to break the system down to individual components to flush, and start with clean parts.

Access to R12 is a simple online, open book test & 609 certification.

B.

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"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest."
~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446.

fastshivy on Sun June 27, 2010 5:33 PM User is offline

Thanks again ...Let me google that and see if i can pass a test! Is anyone manufacturing R12? The tvx has me a little spooked as I got on a Mercedes forum and it looks like you have to remove the dash on this model. I am semi retired so time is not a huge issue. Another question just popped up.....will the cheapest vacuum pump sold on this forum be sufficient? do the pumps do both R12 and R134a?

fastshivy on Mon June 28, 2010 9:32 AM User is offline

Checked out the 609 certification. It looks easy enough, not sure about investing in a recovery unit as it would be used very little. Most of these older cars i find do not even have any refrigerant in them. Even as a DIY I need to stay legal. What would be the absolute cheapest way to obtain a recovery unit? I believe they want the serial numbers for the certification?? Any ideas?

NickD on Mon June 28, 2010 1:51 PM User is offline

Remember that fellow with the same era Mercedes that converted to R-134a? That thread a record for the longest thread since Adam ate the apple.

But recall he finally got good results, but don't recall his handle and he never showed up again after his job was done. Something about what system to use, think it was a TXV, problems with the compressor mounting and finding the correct pulley, added radiator fans, parallel flow condenser, just about everything was changed except the blower and the evaporator requiring a major dash change.

Would be much easier to keep it stock that also includes the stock refrigerant. Could also say, if you want good AC, stay away from a Mercedes, that is from experience.

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