Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
Did the connector on the resistor look like it had gotten hot?
Pretty common on these to do that. You have 2 choices here. First replace the harness. Once they have melted it will arc inside the connector and cause the fuse to blow. Or you can replace the blower and harness together because a lot of times the blower draws way too many amps, then melts the connector and then blows fuses. Whenever we get one of these in the shop, we usually replace the harness first, because regardless it needs to be done, then replace the motor if it continues to blow. If the motor is drawing too many amps it will blow the fuse long before it melts the new harness. They stock a bunch of these harness's at the dealer. If you have an amp meter you can test the motor for current draw when it blows a fuse to confirm if the motor needs replaced.
If you have further questions feel free to reply.
Back again :-)
The blower motor is going to have to be replaced. Here is how it works. When one of the other, or even both the bearings in the motor start to drag it puts more strain on the armature of the motor, therefore cause the contacts between the brushes and the armature to overload, resistance and heat are developed and the circuit then draws too much current/amps and is beyond the fuse amp level and blows. It is characteristic for the motor to do this in an on and off situation, in other words it can work fine one time and as it develops the resistance and heat at the armature and/or bearings it draws too many amps and blows the fuse. That's what makes it confusing with circuits and amps because it doesn't always have to be a direct short to cause the fuse to blow.
I hope that clears things up a bit, but if you have further questions feel free to reply.
It sure wouldn't be the first time a new one was bad but the sure fire way to test it would be with an amp meter to monitor the draw. The dealer has one, but i don't think you would like the cost to test it. So that would be something that you would have to test. There are a couple different meters out there to test it, but kind of hard to rationalize just using it once.....we use an inductive amp lead that simply clamps around the wire and you can monitor the draw.
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Hi if you can get an amp meter in Wednesday that will help. Try to get one like the pic below.
What year is this beast anyway?
Click here for the wiring diagram to assist you in hunting it down.
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Well,,,i do commend you for sticking to it. Most of my customers online would have given up long ago. Well done.
need help on a 1999 Chevy K3500 pickup with a 7.4 L