Volvo Repair: air-conditioner, volvo 240 gl, volvo 240

Question
Volvo 240 GL Injection( break/stationwagon)1986/87
Problem: air conditioner. After a refill of gaz the a.c. works perfect for one day, but only when I drive, not when motor turns stationair. The more I speed, the cooler it is, but still for one day?

Answer
there could be a problem with the expansion valve.I would replace the expansion valve and reciever drier and also be sure there are no leaks anywhere.look for sifng of dampness on all components which would possibly indicate oil leaking out and freon leaking.