I have manuals to replace windshield wiper motor... And have ordered and replace one already... However when I replaced it actually functioned differently to the one I had previously... With my previous motor... The wipers would pop up about 5 to 10cm and then start to work and then when they were switched off they would pop pack to the same position and then move back to the rest position... The new motor I installed does not pop out and as a result hits the black plastic covering between the bonnet and windshield... Am I doing something wrong??? Or is it not the correct motor????