My problem ultimately turned out to be the pin that attaches to the terminal inside of the BEC that’s held together in the middle of the 4 bolts. When turn upside down that pin is loose and melting. I tried the new board knowing the pin wasn’t in great shape. Now it’s all bypassed should of done...
I just had this problem on my 06. I went to junk yard and replaced the board and swapped the wiring and put new fan in. Lasted 2 months. Just finished putting 2 external relays for the fan. All good now. The low speed fan is supposed to come on when AC is on. But didn’t it was the middle...