Can someone please help me out. I can't find the high side valve for my A/C system. The low-side valve is right on top near the valve cover, correct?

thanks

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'85 300td Frybrid WVO Kit

Yup. Cant miss it when looking from underneath the car. I believe pass side.

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http://superturbodiesel.com/images/sig.04.10.jpg
1995 E420 Schwarz
1995 E300 Weiss
#1987 300D Sturmmachine
#1991 300D Nearly Perfect
#1994 E320 Cabriolet
#1995 E320 Touring
#1985 300D Sedan
OBK #42

I just went through this about a week ago. It is located near the bottom of the alternator, passenger side. Mine was pretty full of road grime and difficult to see.

am I right about where the low side is located?

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'85 300td Frybrid WVO Kit

yes

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Current Mercedes
1979 maple yellow 240D 4-speed

Gone and fondly remembered:
1980 orient red 240D 4-speed

Gone and NOT fondly remembered:
1982 Chna Blue 300TD

Other car in the stable:
2013 VW Jetta Sportwagen TDI / 6-speed MT

Here's how you can find the low and high side connection on ANY car......

By knowing the simple flow through an a/c system you will know what is low and what is high side. from that, you can simply trace the lines and find the ports.

Starting at the compressor, you will have a high slde, small liquid line that will go from there to the condensor, possibly through an accumulator or filter drier which might be on the other side of the condensor. The liguid line will then go to the expansion device and then through the evaporator. The output from the evaporator will be a large vapor line which will find it's way back to the low side of the compressor.

SOOooo.... between the evaporator and the compressor will be low side and between compressor and expansion device will be the high side. Trace down the lines and you will find and identify your ports.