Broken or missing blades can cause vibration and affect engine cooling. Defective fans should be replaced as soon as possible. Please Note: Mercedes has superseded the original fan blade and fan clutch on 1986-1989 260E/300CE/300E/300TE up to the following engine numbers:2.6 To Engine # 10-0173362.6 To Engine # 12-0371403.0 To Engine # 10-0188863.0 To Engine # 12-097939You must replace both the fan blade and fan clutch (part #20-025) together. Later engine numbers, either item may be ordered separately.