i replaced my blower motor in my 90 formula 350 but now it doesnt have a high speed just low then the two middle fan settings --- it also makes an annoying sqeeky sound every now and then--usually when its been on for awhile....any help?

thanks

 

Follow the purple wire at the blower motor. Within a foot or so, you'll come to the high speed relay. It might be bad. Then observe that there is a big red wire going to that. Follow that wire. About over the right valve cover you will find a connector of extremely stupid design. I'll bet that's the problem: that connector burnt to ashes like everybody else's. Replace it with the BIG FAT yellow spade terminals, make sure it's the big fat ones because there's alot of current that goes through there.

 

what do you think about the squeeking?
also would this still be the problem if i had high before i changed it----i didnt know if the switch could also be bad??

 

anybody?

 

My 89 IROC has the same problem. I'll have a look at it and see if I can come up with anything.

 

ok cool let me know what ya get ill do the same

 

It could be a couple of things. 1) The high speed relay RB was talking about or 2) The fuse link for the big red wire could be bad. Just put a test light on the bottom of relay where the big red wire is and see if there is power, if so then the fuse link is good. To test the relay put the test light on the bottom of the same relay where the big purple wire is, then turn the fan setting to High, the light should come on, if not, then the relay is bad, or something is wrong with the orange wire that is also at that same relay. Maybe it got cut or whatever.

Whew, do those simple tests and get back to us.

Hope that helps.

 

anybody knwo about the squeeling??