Hopefully i can revive this thread and get some needed guidance.
My blower motor in my 2004 4 door ex Honda Accord stopped working so i did some googling and found the blower motor transistor was a common problem. I pulled it and found the thermal fuse was shot. I de-soldererd the board and installed a new fuse. When i plugged it back in the blower motor started working but it comes on right when you turn the car on and it only runs at high speed no matter what you do from ac control. It also wont shut off. I checked my relays and fuses but they look good. I am wondering if this is a sign that i messed up my soldering? or if there is something else i should look at?

 

It appears the power transistor is shorted closed. See attachments.

good luck

 

This is not a conventional fuse to protect for over current. It is made to protect against overheating not over current. Select a replacement thermal fuse with a rating close to the original 140C rating and at least 2A. It can be a higher current rating with no problems. Most thermal fuses are used in A/C operated heating equipment but will work for this application.