Having problems with your 1990 GMC Suburban ?
My rear window wont roll down with the key anymore but it still works from the inside switch
The key lock cylinder has contacts for the window switch at the inner end of this lock cylinder. They are corroded so they do not work for you. If you can tear it apart and clean the contacts it may work well again for you. Sometimes they are to far gone to clean
Repair Help & Product Troubleshooting for 1990 GMC Suburban
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