I can't find the low pressure port on my 1987 240 DL wagon. The system was converted to R134 before I purchased the vehicle. I found one port on the back of the A/C compressor but it was too big in diameter. Is there another connection on the compressor or is the one I found the only one? Where do I hook up the can of r134 to? Thanks in advance!

You sure its a 134 retrofit (what stickers under the hood)? For most original setups the low side is on the back of the compressor with an "S" next to it. The low side 134 fitting is quite large - 1/2" I think ...