Crazy Blower

[Damien2003]

For the last month now when i turn on my defrost, the air comes out find, 5mins later it startes going crazy. The blower comes on high then goes low. I have 2 take the fuse out 4 it 2 work right. Any ideas what the problem is ? If i hit the ac button or the vent button it does the same thing.

[BlownMerc]

Probably the blower motor speed controller. Possibly the EATC control head, but most likely blower motor speed controller. I have put quite a few on in my day as a Ford tech.