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Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 29520
Experience:  GM Grand Master Technician 2007. 14 years experience.
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2005 Chevy cobalt: The BCM 3 fuse (30 amp) blows..somewhere

Customer Question

2005 Chevy cobalt. The BCM 3 fuse (30 amp) blows after the car has been operating for about an hour. I initially thought there was a short in the system somewhere but the fuse remains good. Could this be a dragging blower motor that eventually needs more amperage than the fuse can handle? Anyone seen a similar problem?
Submitted: 7 years ago.
Category: Chevy
Expert:  GM Tech (Cam) replied 7 years ago.
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GM Tech (Cam) :

That fuse is for the blower motor. If that is popping then you have a blower motor that is drawing too much power.

GM Tech (Cam) :

YOu willneed to replace the blower motor for this issue.

Expert:  GM Tech (Cam) replied 7 years ago.
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Expert:  GM Tech (Cam) replied 7 years ago.

That fuse is for the blower motor. If that is popping then you have a blower motor that is drawing too much power.

YOu willneed to replace the blower motor for this issue.

Customer: replied 7 years ago.
So do you think that it's just drawing more power as it heats up? The last time I replaced the fuse it ran for about an hour before the fuse blew. I tend to think you've nailed it but I wanted to check with a Chevy expert to see if this has been noted before. My confusion is that the fan runs for, as I said, about an hour then blows.
Expert:  GM Tech (Cam) replied 7 years ago.

As the motor heats up, it can slow down if failing. THis will draw higher amps and cause the fuse to pop.

 

GM Tech (Cam) and 4 other Chevy Specialists are ready to help you
Customer: replied 7 years ago.
Okay...thanks. Nice to have an expert confirm my thoughts.
Expert:  GM Tech (Cam) replied 7 years ago.

Thanks for using Just Answer. If you want me to answer your next GM or GM product question, please put "For GMTECH Cam to Answer" and I should get it. Thanks and have a great day!!

Customer: replied 6 years ago.
I replaced the blower motor but it didn't solve the problem. I finally found a short in the wiring to the computer--almost impossible to find. I did, however, agree with you and thought the blower motor was the problem.
Expert:  GM Tech (Cam) replied 6 years ago.

DO you recall exactly where you found this wiring issue?