checking were filler are located on freon lines on 1990 ford e-350....found one by battery on drivers side, not locating the other one. any ideas....this was an old ambulance that is now a flat bed

 

Look by the accumulator for the low side. High side may be on the compressor.

 

believe this or not, i can't find the accumulator. would there be any kind of different hook up with that being an old ambulance?

 

Not really a hook up but a system design. Systems with orifice tubes have accumulators. Systems with expansion valves have receiver dryers.

The accumulators are on the low side after the evaporator. What they do is catch liquid so it doesn't go into the compressor.

Dryers are on the high side.

I am not familiar with these automobiles so exactly where the service ports are I don't know.

Follow the big line from the compressor to the firewall. It is there somewhere.

Are you needing to charge the system?

 

Just make sure you only attach the can to the low side (bigger of the two).
High side pressure will blow the can.