1986 Buick Skyhawk 1.8L 4 Cyl. 1986-1989 Buick Skyhawk 2.0L 4 Cyl. In earlier vehicles, they are used to directly turn the compressor off to avoid compressor failure. Ensure Proper FitTo confirm that this part fits your vehicle, enter your vehicle's Year, Make, Model, Trim and Engine in the Compatibility Table.