Question about 1999 GMC Suburban
Posted by Anonymous on
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Posted on Jan 02, 2017
SOURCE: blower puts out too many amps
I never read that the fuse was blowing in any of the descriptions, but if we are going to jump ahead and suppose the armature is shorted, wouldn't it be easier to just pull the plug off the motor and replace the fuse and turn the motor switch on and see if the fuse pops after we have eliminated the motor. If fuse does not blow, the motor is bad. If fuse blows, you have a short somewhere.
In my experience, armatures usually fail open and the motor simply won't work. I still stand by my suggestion of step by step methodical troubleshooting rather than buying the parts first.
Posted on Jan 07, 2009
It sounds like your blower motor may be bad. I don't know if you know how to check power at your blower motor plug, but you can use a volt/ohm meter or a test light. If you have power (12VDC) , your motor is most likely bad. There is also a resistor block module which has 2 resistors on it. It controls the motor speed basically by restricting the power by directing it thru one of the resistors. The higher the resistance, the slower the motor turns, thus the 3 speeds for the motor. The resistor module is mounted on the blower housing and has 2 screws holding it in with a small plug connected. It is just about straight ahead of the passengers left knee.
You can get used motors from a junk yard pretty cheap.
Posted on Jan 28, 2009
In your Suburban there is a high blower relay.
When the switch to high is selected it activates a relay to another circuit that is fused separately.
This fuse in under the hood marked blower fuse 3 which is a 50 amp fuse.
This is most likely the problem.
However, if it isn't then the problem becomes the relay, the switch or a broken wire.
If it isn't the fuse, contact me back here using comments and I will help you with the next step in fixing your heater blower.
Thank you for using FixYa.
Posted on Jan 21, 2011
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