98 E320 A/C help

[m rose]

I am working on a co workers car, seems its low of freon( he thinks) and the controls dont turn on the A/C compresor.
does anyone know a SITE where i can review a wiring diagrahm or more info thanks
M Rose

[jwko]

If the system is extremly low on freon the compressor will not kick in. Put a gauge on the low pressure side and see what pressure you have. It should be quite a bit of pressure as the system pressure will equilize on both the high & low sides when A/C is off. If pressure is very low, I would look for a leak.