Recharge A/C 95 SL500 - Mercedes-Benz Forum
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post #1 of 27 (permalink) Old 08-25-2009, 12:25 PM Thread Starter
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Recharge A/C 95 SL500

Hi,

I want to recharge the a/c in my 95 SL500
Where is the low pressure port (picture would be nice)
what refrigerant do I use?

thanks
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post #2 of 27 (permalink) Old 08-25-2009, 12:56 PM
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Most people on the site will tell you if you have to ask where it is you dont know enough about AC to do the work. I kind of agree. If you do it wrong you can cause 3 to 4 thousand dollars worth of damage. The stuff that they sell at grocery stores should have never been allowed. Refrigerant can cause frostbite at the least or if it gets in your eyes it can cause blindness.

My dealer is charging me $69 to do the work. I dont think thats too unreasonable

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Last edited by Nimrodthewombat; 08-25-2009 at 04:25 PM.
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post #3 of 27 (permalink) Old 08-25-2009, 03:53 PM
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Thanks!

My A/C needs recharging also, so I read this post with interest. I will take it in to be recharged!
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post #4 of 27 (permalink) Old 08-25-2009, 06:10 PM Thread Starter
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Originally Posted by Nimrodthewombat View Post
Most people on the site will tell you if you have to ask where it is you dont know enough about AC to do the work. I kind of agree. If you do it wrong you can cause 3 to 4 thousand dollars worth of damage. The stuff that they sell at grocery stores should have never been allowed. Refrigerant can cause frostbite at the least or if it gets in your eyes it can cause blindness.

My dealer is charging me $69 to do the work. I dont think thats too unreasonable
Nimrod,

that kind of reply is not very helpful. The whole idea of these types of sites is to share knowledge so that people can make thier own judgements, as to things they are willing to tackle. I asked a simple question which could have been answered very easily.

Luckily I went down to the local autozone, and the sales clerk showed me which connector it was. for $20 and 5 minutes of my time. I was able to recharge my system.

for anyone else reading this thread for the answer
the connector that has a black (similar to a bicycle tire) is the low pressure , you will notice the tube is insulated, and leads into the dash , it is on the driver's side. for my year sl, it uses the r 134 refrigerant ( i found the label when I checked under hood (drivers side as well). Please don't let any one intimidate from trying this. read the instructions on the recharge kit, and by all means please make an attempt to be safe by wearing saftey goggles, and a good set of gloves
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post #5 of 27 (permalink) Old 08-25-2009, 06:40 PM
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I would encourage anyone who is interested to recharge their A/C themselves. I will add two points.

First, its best to use a pair of gauges: one for the high-side pressure and one for the low. This helps ensure that the system is not over or under-charged. Used gauges are inexpensive on eBay and Craigslist.

Second, if refrigerant is leaking out, then the oil that mixes with the refrigerant is probably leaking as well. Therefore, if you are regularly adding refrigerant, then at some point you probably should add an oil charge as well.

Many used parts available from a '92 SL. Email or PM for more information
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post #6 of 27 (permalink) Old 08-25-2009, 07:29 PM
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Helpful or not it's true. When your system leaks out the refrigerant (and it will because you have a leak in the system) you will pay big bucks to get it fixed correctly. In order for the system to be recharged correctly you must evacuate and vacuum the system before recharging.

My comments about working on air conditioners being dangerous when you don't know what you are doing are also true.


I'm sorry that you took my comments the way that you did. My concern was that you not damage your fine car any more than it is already and for your safety, not to make you feel inadequate.

I still say that when you are dealing with a highly pressurized system on a $100,000 car and refrigerant that causes frostbite on contact and you don't know where to add the refrigerant or what kind you should use that you are in over your head.

I'm glad you are ok. I hope your car is too.

BTW the fitting for the low pressure side will not fit on the high pressure side. They are different sizes.

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Last edited by Nimrodthewombat; 08-25-2009 at 07:41 PM.
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post #7 of 27 (permalink) Old 08-26-2009, 02:42 PM
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Welcome to the forum, yes we are here to assist and some times laugh.
Some times members try to protect other members especially if they seem not to
have enough knowledge.

I believe that depends on the individual some can, others can't.
In your case you were able to do the repair, and I am glad that you did.
You are from the ones that can so keep on asking.
(You are not from the types that give up easily.)
Right Mr, L Bull?

One of the problems that I see on charging is that the refrigerant has oil with it.
It is OK if you have a leak and you only add a can or two.
(Some of the oil leaked out any ways.)
But too much oil takes the space of the refrigerant so the system gets over loaded
with oil, and there isn't enough refrigerant to do the cooling....

Two test gauges with valves will do a better job like Bob recommended.
But you can also get easier in trouble.

As far as the car been expensive or dangerous.....
It is the same danger on an inexpensive car.

Now as you know there is a lot of legality's of blowing refrigerant in the atmosphere.
So replacing compressors evaporators etc, with out certification, the proper tools, and know how I would say leave that out for now.

Regards.
aam.
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post #8 of 27 (permalink) Old 08-26-2009, 08:17 PM
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Like Bob said the important thing is to also add oil,people re-charging over and over and wondering why the compressor fails.
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post #9 of 27 (permalink) Old 05-12-2015, 11:25 AM
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I agree with the author of the original post... more n more im beggining to leave from my time spent on the site, with the worst taste in my mouth from members who lack the most basic fundamental points of people skills.
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post #10 of 27 (permalink) Old 05-12-2015, 12:10 PM
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The OP asked two very basic common questions, why jump all over him.

On MB, the low side connector can be hard to find, often not in a common location. Granted, the owners manual does say what refrig to use, as does the sticker in the engine compartment. But given the age, it's not uncommon to (a) no longer have an owners manual and/or (b) have the underhood stickers either gone or not readable. now off my soapbox


There are stickies that will tell you how to access the climate control diagnostics. From these you can read pressure directly from the climate control panel. and using the diagnostics in the stickies you can determine if the pressure is below normal and refrig needs to be added or if your overcharged. You don't even need a set of gauges they are included with the car!

And on R134 I'd say it is virtually impossible to hook to the high side with the cans sold in U.S. stores. And all U.S. 129's use 134. 134 doesn't use a screw on shrader valve the same size on high and low sides like R12 did. R134 low side is a press on coupler.

high side is a completely different coupling.


--------His------------Hers-------

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/Parchment Leather/Black Top


Chromed OEM wheels, Akebono's, H1+90 fog, Burlwood/Leather shift knob, Rostra Lumbar support, Check seat heaters, Bilstein's, Parrot Bluetooth, GG Bailey Custom cargo mat, GG Bailey trunk mat, Real Burlwood Instrument Cluster w Chrome rings, Burlwood & Chrome shift surround, Euro headlights with Osram 70W/65W H-4's, clear corners, Silverstar corner lamps, Euro Trunk mount Warning triangle, SL600 Burlwood armrest trim & Burlwood cupholder sliding cover, Kahtec flashing third brake light (CHMSL)


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Last edited by e-420; 05-12-2015 at 12:15 PM.
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