Root cause insight into the common BMW blower motor resistor failures
The fsu from behr doesnt have that resin and it was easy to open.the new module has the transistor on a copper plate to make the heat transfer fast but the contact with the aluminium its not so good.I did lost the waranty when i did this,but i'm not giving up in building an fsu from scratch.I have some pictures of the fsu.
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