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If it stopped workin', then worked again, there's somethin' else goin' on.
Look for a dirty contact at the switch. Ya' gotta' break down the console, and check for power comin' in to the switch, and check the ground wire too for continuity.
84 c4 werked fine ...then didnt fer day or two real cold....then ok again ...now nothing...any clues where to look be great...thanks
I live in Toroto, and learned early on in my 86 Coupe - if it gets cold(freezing or below!) and your outside mirrors get water/moisture inside them, the water can freeze and prevent the mirror-controls from working! If my car then can thaw inside my garage(un-heated but above freezing) for a day or two - the ice/water then thaws and dries out. Voila - mirrors are working A1 again! With a warm/heated garage, the fix should be even faster.