SOURCE: 1994 volvo 850 - non turbo
Try cleaning the throttle body and air idle control valve (IAC). The computer kicks the idle up when the a/c is on, if your throttle body or AIC valve is full of crud it will idle very low and feel rough.
SOURCE: 1993 Volvo GLT 850 Electrical things won't work
I'd be taking the dash apart looking for burnt wires in a harness, so you will likely have to take the outer cover off some of the bundles. Start tracing back from the plug in for the radio. Hope this helps.
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