Change color of part of row if condition met

Hello, I'm working on a macro to change the color of the row between column W to AN if in column K the value is "FCA" (without quotes).

So far I have this, but it doesn't work:

Sub Test()

For Each cell In Range("K1", Cells(Rows.Count, "K").End(xlUp))
    If InStr(1, cell, "FCA") Then
 Range("W" & cell.Row & ":AN" & cell.Row).Interior.ColorIndex = 3
    End If
Next cell


End Sub