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I've got a real gremlin hiding in my '89' 240 wagon-the rear defroster doesn't shut off like it should after it's been on for a while.I've swapped the relay and the switch,cleaned the fuseblock&replaced the fuses,checked the wiring at the hinges(their both getting bad,but everything works);I've pulled the fuse and the damn thing still won't shut off(the O/D even still clicks in& out).Last night,I even tried unplugging the harnesses with no effect.There seems to be a feedback problem, but I can't find it.I also noticed that the A/C pump doesn't seem to be cycling when the A/C switch is turned on.In nearly 30 years of working on Volvos, I've never come across this problem before-
Any ideas or tips to help me figure this out?
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