This week’s Corvette question comes from Mike who owns a 1993 C4 Corvette.
How do I adjust the windshield wipers on my 1993 Corvette?
Despite their notoriety as a high-performance car and their innovations in design and technology, the C4 Corvettes had their fair share of imperfections. One common problem is with the C4 Corvette Windshield Wipers. Although only a minor flaw, the wipers on many of these Corvettes are not properly adjusted to rest beneath the hood when turned off. When the wipers do not park correctly, they can scrape the black paint on the window trim, resulting in unsightly scratch marks on the trim and blemishing the aesthetic appeal of the vehicle. Fortunately, this minor problem can be easily corrected. All you need is a ratchet, 10mm socket, a flat-blade screwdriver, and no more than 20 minutes of your time. This simple adjustment will allow your Corvette’s wipers to rest below the hood line and prevent your Corvette’s window trim from being scratched again.
After opening the hood of your Corvette, look in the direction of the wipers where you will see the wiper transmission access plate. Remove the plate with a flat-blade screwdriver by carefully prying up on it. Not all C4 Corvettes have this plate, if you don’t simply remove the entire grill. Once the access plate or grill is removed you will have access to four retaining nuts. Loosen them with a 10mm socket but be sure not to remove them as reinstalling the nuts can be very difficult. Last, gently push the wiper arms towards the firewall. You will need to adjust both arms to avoid interference between them. Adjust the arms until they do not hit the windshield molding or they are below the hood line.
Once you have your Corvette’s windshield wipers adjusted properly you can tighten them down. Be sure not to over tighten or you could snap the stud on the linkage. Now check the adjustment. Close your Corvette’s hood and have someone spray water on the windshield while you operate the wipers. (Don’t operate the wipers without water on the windshield or you could permanently scratch the glass). Make sure the wipers are no longer hitting the windshield molding. Switch the wipers to high to check that they are not contacting each other or binding up. If they are contacting, then readjust them until they no longer contact each other. The same applies if they are still hitting your Corvette’s windshield molding. Once your adjustment is satisfactory, replace the access plate or grill and your job is done.