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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)


(I know to fill on the low side!)

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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Old 05-11-2001, 06:22 PM
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
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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Old 05-11-2001, 08:01 PM
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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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