dell supportassist

hello i changed my cpu fan from my dell computer vostro 3668 and i turn off the 'dell supportassist' but alawys when i boot my pc scans for errors and always says cpu fan failure but the fan works perfectly and i have way lower temp then the old one so please can someone tell me how i can disable or delete that thing.(i changed from the intel stock coller to coller master 212X)