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-   -   Blower motor issue (https://www.hummerforums.com/forum/hummer-h3-17/blower-motor-issue-41892/)

Mark68 Sep 15, 2019 12:34 PM

Blower motor issue
 
My blower motor continues to run with the engine off. I replaced the blower motor resistor but the problems persist. I thought about possibly replacing the blower motor relay but can't find the relay anywhere, i checked the fuse boxes and don't see one.

oceanbrave Sep 16, 2019 04:33 AM

1 Attachment(s)
https://cimg1.ibsrv.net/gimg/www.hum...fd0761ed4c.jpg
This is a very common problem, not sure what year you have, but for a 2005's there isn't a blower motor relay, pretty sure yours will be the same.

The Blower Motor Control Processor (commonly called a "Resistor") has a single Blower Motor Speed Control input and two outputs to the blower motor, thats all (other than GND and VBATT)

So either the pulse-width-modulated input is somehow running flat-out (unlikely) or your replacement module is also faulty, where did you get it from?

Replacement controllers are hard to find, there's actually a repair service on ebay but you can do it yourself usually just a case of replacing the power MOSFET (IRFBA1405PPbF) search on ebay or RS Components.

Close to this very thread is this one which goes into more detail.


Keep us posted.


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