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  #1  
Old 05-11-2001, 02:50 PM
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Join Date: Oct 1999
Location: New York City Burbs
Posts: 177
It has been a couple of years since I topped off my R12 in my 84 190E.

Before I put my manifold/gauges on, which was the HIGH pressure nipple, and which was the LOW side. If I recall the low was up near the left (drivers) strut tower and the high side nipple was over near the oil dipstick / exhaust manifold (right side)

Thanks

(I know to fill on the low side!)
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Patrick Leber
'84 190E 2.3
'83 Porsche 944 (track car)
'84 Porsche 944 (parts car)
85.5 Porsche 944 (sled)
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  #2  
Old 05-11-2001, 06:22 PM
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Join Date: Mar 1999
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An easy way to be sure is to run car & see whitch one gets hot! the hot one is the high side. Also the high side uses a *smaller* dia tubing than the low side.
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MERCEDES Benz Master Guild Technician (6 TIMES)
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190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
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  #3  
Old 05-11-2001, 08:01 PM
dlswnfrd
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Hi Lo

Brother of the Benz
In determining what line is what, remember that the low or suction line is the larger of the 2 and returns from the evaporator/dash to the compressor. When the A/C is operating this line will be cold. The discharge is the smaller of the 2 and goes from the compressor to the condenser. This 1 is HOT.
Your charging hoses must have valve openers.
If you are capabile of servicing your unit, and considerring the cost of R12; you may consider changing to R134A.
The change over is quite simple and very inexpensive, $29.95 at K-Mart. This includes 3 cans of R134A, 1 can of oil charge, a can adapter and charging hose with excellent instructions.
My W124030 does quite well with R134A.
Happy Trails Beep Beep from The Spiderman in Houston!!!
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