blower mtr fuse keep burnt, help needed!
#1
blower mtr fuse keep burnt, help needed!
Maxima 2000 SE.
all of a sudden, my blower motor fuse burnt out. They are 2 15Amp fuses, all burnt. OK? I put new ones on, get burnt in 1 day. test done as below:
turned blower motor on, no problem.
turned on AC, no problem
manully upspeed blower motor, no problem
maunlly downspeed blower motor :---- flash!
and fuses are gone....
I took the resistor out, it feels warm, some corrosion found on surface.
My question: is the fuse burnt out because of resistor expired?
Thanks in advance
all of a sudden, my blower motor fuse burnt out. They are 2 15Amp fuses, all burnt. OK? I put new ones on, get burnt in 1 day. test done as below:
turned blower motor on, no problem.
turned on AC, no problem
manully upspeed blower motor, no problem
maunlly downspeed blower motor :---- flash!
![EEK!](https://maxima.org/forums/images/smilies/eek.gif)
I took the resistor out, it feels warm, some corrosion found on surface.
My question: is the fuse burnt out because of resistor expired?
Thanks in advance
Last edited by erictown; 10-29-2012 at 07:46 PM.
#2
I don't think the resistor could be doing this. The way the fan motor works is that one side of the fan motor is connected to the fuses. To make the fan spin, the other side of the fan motor is connected to ground. For high speed, the fan is connected directly to ground. For slower speeds, the resistor gets connected between the fan motor and ground.
Translation - you have a bad fan motor.
Translation - you have a bad fan motor.
#3
I don't think the resistor could be doing this. The way the fan motor works is that one side of the fan motor is connected to the fuses. To make the fan spin, the other side of the fan motor is connected to ground. For high speed, the fan is connected directly to ground. For slower speeds, the resistor gets connected between the fan motor and ground.
Translation - you have a bad fan motor.
Translation - you have a bad fan motor.
#8
problem solved. After disassembled motor and the resistor, I found some small rust and burnt spot around 3 welds. They're actually getting too close because of corrosion between them. short circuit must be happenning somewhere sometime. I cleaned around all welds. Now no fuse problem.
Thanks fellows.
Thanks fellows.
Last edited by erictown; 11-02-2012 at 06:22 AM.
#9
came in to post this
when rust gets built up on the resistor contacts, it literally " adds " metal which in turn lowers resistance and when you lower resistance, you increase amperage , and when amperage gets increased and it exceeds the current rating on the fuse that protects the circuit....***POP!*** It blows the fuse
Just some FYI
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