if it makes a clonking noise then the mecanisim inside is knakered and the motor isnt stalling if it thought it had to go further it would come back down again as they have a anti trap function on them ,is very common on these if so go on ebay brand new ones on there for 35 pound lr want 140 pound lmao,had to do mine about a month ago ,when it reaches the top or bottom the motor should just stall no matter what if it trys to go further the teeth have worn away
to adjust the motor you can disconnect the battery then reconnect it then fully open the window till the motor stalls then imediatly close it fully till it stalls will then say window set on the dash job done