One problem that I've encountered on both of our 940 Turbo Volvos (1993 and 1994) is the air conditioning control switch. I think that it's really important to point this out because I'm sure that I can help someone save a bunch of money from an expensive mis-diagnosis.
Steve, the ex-owner of Drive for Life Volvo Saab in Las Vegas is the one that told me about this. What happens is that the soldered connection behind the "AC Off"or "AC ON" switch (depending on the year) fails; the solder breaks and so the switch doesn't work. It typically goes intermittently, where once in a while it will work until there is never a connection.
This can be mis-diagnosed by anyone who is not formally trained or experienced with Volvos so beware! You may be told that you need a compressor, drier, condensor...NO. Have your mechanic check the switch first if there is no A/C clutch engagement when the switch is pressed. You can check the switch if you can reach under the dash and find the wires, connect your voltage meter to each of the wires and see if there's a change in continuity when the switch pressed. Your mechanic can either take it out and solder it for around $120.00-$180.00, or replace the panel.
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