GMC Troubleshooting Questions? Ask a Mechanic for Answers
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This may not be the info you wanted to hear here but unfortunately I have ran into this several times before and the only way to repair this is to replace the sun visors themselves.I have tried to remove the mirror housing but it usually becomes damaged or damages the visor itself.I know you can locate these used in places like Ebay or a salvage yard as a complete visor assembly.
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