Since it's so hard to find a shop willing to simply recharge my r12 system. Most say all they can do is convert the entire system to R134 but want to charge an arm and a leg.

I purchased the conversion kit from the auto parts store but it didn't work. The fitting in the kit was wrong or something, the kit said r12 to r134. What am I doing wrong?

Basically my question is how do I convert the low and High side fitting to r134?



Thanks

Your car should already be 134a

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1999 C280

What country are you in?

that is what I was thinking.

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Jim

It is ................................

Read the yellow A/C " Refrigerant Type/Capacity Warning Notice " tag on the radiator cross member.

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A Dalton

All MB's starting in 1994 had R134a from the factory!

__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator

really so why cant I get this r134 recharge kit to fit. I got one with a gauge on it from Advanced but it doesn't fit on the low side.

The one with the black cap right behind the compressor right?

I am not familiar with the C class but my 95 E320 has the low pressure side fitting up near the intake manifold and about halfway back to the firewall. The high side is slightly to the front of the compressor and down lower in the engine bay.
You need to find the low side fitting (it is the smaller diameter of the two).
Please be careful and wear safety glasses. This is a job that is better left to someone that understands a/c systems.

Man I'm stumped, Mercedes faxed me over an AC system Diagram but it looks like I'm missing something.

I cannot find the low side. The one down below right behind the Compressor is in fact the High Side. I traced every single line but some go underneath very hard areas to see.

Anyone know what general area I should be looking? Isn't it true in most cases the low side sits higher than the high side?

Post a pic of your engine compartment - the experts here will quickly identify the port. It should be in the "thicker" A/C line which is typically wrapped in foam. It may have a black cap on it which might be making it harder for you to see.

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08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280

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A Dalton

Yep... in fact, I think most car companies switched to R134a in 1994. Lexus changed over in 1993.

On my car the other fitting is just behind the grille on the drivers side by the side of the radiator. Open the hood, look at the front of the radiator (where the bugs are) and look at the drivers side of it. See if there is a black cap peeking out. I don't know if that's high or low but the other fitting is behind the compressor. Don't know if it's the same for '95.

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra

In the E class chassis, the switch over to r134a started in 1992 with the 400E and 500E.

The 300E and 300E 2.8 came with it in 1993.

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Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".

you get small size to large size adaptors and vice versa , you can use any of the charge points depending on whether you are using vapour or liquid if you havent done HVAC dont do it yourself you can destroy your compressor vanes , if r12 your system must be flushed and new orings fitted the gasses are not compatible and make an acidic mix which will destroy your system over time , that is why it costs to convert.