Megane 1 blower resistance

Hello, I have a problem and it’s about my mother’s car and I hope someone can help me. It’s a Renault Megane 1 with, tailpiece and 1.6 l machine It all started with the rain, the interior was wet and so it was clear that the procedures were clogged. Now I wanted to take care of the problem today and cleaned the left side because I can’t get to the right side because the windscreen wipers have been jammed or have been screwed to hard but I remove that. moren with a puller. Now the first question the Megane has no processes with a hose but it is enough if I remove the mud (left side with battery I found nothing and therefore only removed the mud which then partly fell by itself on the ground. Now my real problem the blower goes only from level 5. I guess it is the resistance now I don’t know where it is on the Internet already looked through everything and from under the battery, behind the r center console, under the amature board on the left side in the blower box everything found. It is like said a 1.6l megane from December 1997 with air conditioning 6 stufig. If you need to know more please write. What does this resistance look like? Have found a wise box with large Bos*h logo, a plug with silver gray heat sink etc already too much on the Internet. Sometimes there was also talk of a cable harness. In my workshop the 2 hours for installation and 130€ for the part and that’s not worth it anymore for such a car. Can it be something else? Will it solve the problem as soon as possible because I don’t want my mother driving around with a broken blower in this season Thank you for your quick help