Question about 1991 Mercedes-Benz 560

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I have a 1986 mercedes 560sel with AMG package. The a/c was converted from R12 to R134. At times the a/c is cooling and then it periodically stops gets warmer and then cools again.

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91 Mercedes 300 E has R12 ac system that is no longer blowing cold. A faint bit of cool air sometimes shows up but it can hardly be called cool. Is there any additive out there compatible with R12?


Propane does the same as R12. I don't recommend it though(highly volatile). Best to convert to 134R. Last time I converted an R12 system was about 10 years ago. I would tell you how to do it, but I could get in trouble because you have to vent out the R12 first. I don't even know of a shop that has an R12 unit anymore. Good for you, they still have the adapters to go over your ports and the 134R today is compatible with the old systems oil. No need to change the compressor, dryer, and expansion valve.

Jun 06, 2016 | AC Cars & Trucks

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How do I figure out what type of refrigerant I need for the ac?


The car originally had R12. If it has not been converted to R134 you would need to have it serviced by a pro or have someone convert it to R134. The R134 fill kit will not fit the R12 fittings.

Jul 30, 2013 | 1990 Chevrolet Lumina

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How do you convert R12 AC systems to R134


http://www.aa1car.com/library/retrofit.htm

google really is a friend, 1s hit. and is a very complex subject.

Apr 08, 2013 | 1990 Geo Storm

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How to convert my a/c r12 to 134a my car is mercedes e300 1986


As far as I know you only have to change the compressor and dryer-filter to comply with 134a. Other components from old Freon 12 are safe to use for 134a. There's an Urban (mechanics) legend that you can use a 134a to an r12 system, but you can't use an r12 to a newer 134a system. But be on the safe side, change the compressor and dryer to use 134a or ask an expert on refrigeration.

Oct 03, 2012 | 1986 Mercedes-Benz 300

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How to recharge the A/C system


You would need to find out if the system has been converted to R134 or if it is still using R12.
If R12 you would need to have a licensed tech do it, or have someone convert it to R134.

Aug 30, 2012 | 1985 Jaguar XJ6

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Retrofit ac, how much 134a needed where there was 2.5 lbs of r12?.. what is new correct equalized pressure?. whats high side,? low side? while operating?


2.5 lbs sounds like a lot of gas thats about 1.1kgs ,anyway i think it will work on around 800grms of R134 ,now use the same weight of gas but start around the 800 grms mark as too much gas will hold the engine back ,Now R134 gas is different in its cooling properties and the pump pressures are different as it doesnt need such a high pressure or a big cooling radiator ,i have no idea where the fillers are but look pump for the fattest tube and follow this back to the firewall and you will find the low pressure connection here.Fit the adaptor here for the R134 and then if you havent a vacumn machine to do it properly just start engine and turn AC on with the fan motor and let it charge and as the pressure builds up the pump will click on and **** the gas in for you.Now remember that as R134 need a bigger cooling radiator to cool the high pressure hot gas so the smaller rad used for R12 will not be as efficient it will work when moving better than stationary so make sure that the exterior of the rad is well clean and no dead bugs on it .As stated it will work and if you have any R12 gas still in the system it will mix ,I mix CO2 from a beer barrel gas bottle into my machine with R134 as its so much cheaper iam paying 248euros for 15kgs of R134 so the average car of 750 grms is costing me about 14 euros in gas alone without the 2500 euros for my machine

Jun 18, 2011 | 1986 Chevrolet S-10 Blazer

1 Answer

What type of refrigerant for a/c


It came from the factory with R12 but look and see if it has already been converted to R134. If not then convert it over the R134 as R12 is very expensive. If it is low then you have a leak that must be repaired before adding refrigerant. It is illegal to add refrigerant to a leaking system.

May 22, 2010 | 1995 Cadillac DeVille

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Broken ignition switch in 1986 m/b 560sel Have


you will have to replace the lock barrel(not cheap)

Apr 06, 2010 | 1991 Mercedes-Benz 560

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Have a 1986 F-350 A/C puts out cool air but not cold. Don't know if system is R12 or 134A. Compressor is centr and has 2 threaded black caps with schrader valves for gage connection plus 1 quick disconnect...


in 1986 it is r12 but you can convert to r134 which is a ton cheaper than paying for r12 you need a license to buy r12 r134 is right on the shelf at auto zone they also sell retro fit kits with everything you need to convert your system and they work very well

Aug 18, 2009 | 1998 Chevrolet Cavalier

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