MFTBC investigated the failed part and found the dent with 1.6mm on the bracket where is to measure the temperature. Bimetal and Bracket were interfered due to the dent and clutch cooling fan failed to operate. The reason for bent is unknown and difficult to guess. MFTBC would like to recommend not to disassemble or to pump silicon into the subjected part, otherwise to suggest replacing the assembly. When the similar failure occurred again, please leave them assembled and keep the part in stock until MFTBC request to send them back. Thank you for your understanding. This PQR is recorded.