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07 Acadia...Blower motor will not shut off...

5K views 5 replies 3 participants last post by  Murphree35 
#1 ·
SO my issues continue..Have a amp ordered..A BCM ordered...Replaced the Resistor below the glove box as it was smoking hot when i took it out....Put new on in and still would not turn on...Wife was driving it 2 days later and going down the road it kicked on...Blows ice cold or hot, i can change it back and forth.. Problem is when she got to work, it would not turn off..Took keys out and hr later still blowing, so i took the fuse out to kill it .....Any idea's , thinking our's is half Christine...
 
#2 ·
interesting that you say its ice cold or hot.

meaning something is also commanding the AC to turn on....

Keep is updated on what you find with the ordered parts.
 
#3 ·
Murphree35 said:
SO my issues continue..Have a amp ordered..A BCM ordered...Replaced the Resistor below the glove box as it was smoking hot when i took it out....Put new on in and still would not turn on...Wife was driving it 2 days later and going down the road it kicked on...Blows ice cold or hot, i can change it back and forth.. Problem is when she got to work, it would not turn off..Took keys out and hr later still blowing, so i took the fuse out to kill it .....Any idea's , thinking our's is half Christine...
Check the wiring terminals at the resistor module. If some of the pins are dark or darker than the others you should replace the pigtail. Check the new part too in case it is affected. Check the blower motor terminals too. The blower is a higher current device and can overheat the terminals. It's best to replace all the male and female connections at the same time(the part and connectors) as needed.

It's typical for a blower motor to go bad and work at times. Maybe you should replace it too.

The body module isn't connected to the HVAC.

There's a dark green wire that goes from the A/C control head to the resistor. That varies voltage to the resistor and can be measured with a meter or maybe a test light to see if it changes when adjusting the blower speed.
 
#4 ·
So i took the new resistor out and put the old one back in...put the fuse in and nothing....Took old out and put new back in, installed fuse and on it came...I did notice the wires, wrapped in electrical tape to be as if tape was melting, you know the slimy feel.....Now to back track that i suppose...The fuse box had been replaced after we got it, wonder if they messed something up or got a wire backwards or left something off..But why would it work for so long, come and go at times and then just stop all a sudden, and now wont turn off......Thoughts....
 
#5 ·
If that fuse box was replaced for corrosion there may be some new problem with the fuse box or existing wiring to it.

The new blower resistor could have issues and you need to determine if it's bad or doing what the control is telling it.

That blower motor can have weak armature/brushes which will make it stop working at times or pull to much current through it and it's control parts.

The wiring terminals to them can be corroded from heat which will cause intermittent operation. Any discoloring should be investigated. Greasing the terminal pins with a silicone dielectric is a good way of preventing corrosion and microfretting which will stop current flow.

The control module could also be a problem giving erratic signals to the resistor.

So what would you like to do, change some parts or whip out a volt meter, any cheapo will do.
 
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