How do you replace back window seal in 1980 240d Benz?

To replace the back window seal in a 1980 Mercedes-Benz 240D, first, carefully remove the rear window by cutting the old seal with a utility knife and gently prying the glass out. Clean the window frame and ensure there are no remnants of the old seal. Apply a new sealant to the frame, then carefully position the new window in place and press it firmly into the sealant. Finally, allow the sealant to cure as per the manufacturer's instructions before using the car.