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Old 08-26-2007, 05:38 PM   #1
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Default blower motor question

the blower motor stop working so i toke it off and when up to auto zone and then they pluged up the motor to a 12v battery and it work so i when home and checked the votage coming to the plug and it is at 12v. and ideas why it is doing these because in georgia the heat is bad it is about 100+ here and it is a 94 se
any inputs would be nice.
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Old 08-26-2007, 05:48 PM   #2
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Could be the plug, where the power comes to the cabin blower fan, is corroded or there is not any power going to the blower and its a blown fuse or broken wire problem...
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Old 08-26-2007, 05:57 PM   #3
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at the plug it is showing me on a volt meter 12v and when i plug it up the fan just sit there and does nothing but i put the plug and test it again it stills shows 12v and the contacts are good and i made it where the plug would have to make contact with the fan contacts.
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Old 08-26-2007, 10:35 PM   #4
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Did you measure across both connections to get your reading, or did you ground the meter on the engine? If the latter, try across both the connections. Perhaps you have an open ground.

If you still measure 12volts, then try to get a measurement with the plug connected. It is possible to read 12 volts when the circuit is not drawing current, yet have that drop when it is unable to provide the current needed.
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Old 08-27-2007, 12:06 AM   #5
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the 12v reading is on the two plugs and not grounded out on the motor and how would i see the volts when it is plugged in to the blower motor?
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Old 08-27-2007, 02:49 AM   #6
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You'll have to pierce the wires with a probe to get the voltage reading the connector is attached. After taking the reading, clean the wire up well with alcohol, and reseal it with silicone.
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Old 08-27-2007, 01:45 PM   #7
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Although you may be able to measure 12 volts across the terminals, it'* amperage that provides the oomph you need to actually turn the motor and blow air. I would suggest checking the wiring harness connections at the resistor pack where it'* installed in the duct, under the hood not too far from the motor itself. Corroded connections there may be providing so much resistance that the motor'* not spinning. Also make sure that your ground wire connection at the motor is good.

Aside from that, a worn blower motor may spin just fine under power at one angle but not another. For example, in this car it'* mounted with the motor axle horizontal. It may run fine on the workbench when lying on its back, but tip it up on its side as if it was mounted in the car, and it may die. If it'* still out of the car right now, try hooking up a power supply to it and turning it to various angles while it'* running. Any change of speed means it'* probably shot.

My vote is on a corroded resistor pack connection, but an excessively worn motor would be a close second.
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Old 08-27-2007, 05:14 PM   #8
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ok one thing that might help the the troubleshooting is about a mouth ago i could turn the car all the way off with the keys in my pocket and the fan would still be running so to turn it off i would just unplug the motor and it would stop running and when i would need it i would plug it back up but when i did that it only had one speed and that what high (it would blow 2 times as hard as before)
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Old 08-27-2007, 07:02 PM   #9
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Quote:
Originally Posted by acg_ssei
Aside from that, a worn blower motor may spin just fine under power at one angle but not another. For example, in this car it'* mounted with the motor axle horizontal. It may run fine on the workbench when lying on its back, but tip it up on its side as if it was mounted in the car, and it may die. If it'* still out of the car right now, try hooking up a power supply to it and turning it to various angles while it'* running. Any change of speed means it'* probably shot.
if i just plug up the motor and not put the motor into the hole just have it sitting on top of the sway bar it will not work no mater how i have it angled..
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Old 08-27-2007, 11:43 PM   #10
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Quote:
Originally Posted by roadkills
ok one thing that might help the the troubleshooting is about a mouth ago i could turn the car all the way off with the keys in my pocket and the fan would still be running so to turn it off i would just unplug the motor and it would stop running and when i would need it i would plug it back up but when i did that it only had one speed and that what high (it would blow 2 times as hard as before)
That sounds like a high-speed bypass relay that'* stuck closed. I can't picture the details of that on the Bonne, but on the older GMs, the bypass relay was mounted on the firewall and fed by its own 10-gauge or 12-gauge lead from the engine harness. When you dialed up HIGH or MAX fan speed on the dashboard, the relay would cut in full power to the blower, bypassing the resistor pack in the ducts (which provided the lower fan speeds).

Usually the bypass relay circuit would die first, from melting a certain in-line connector in the harness leading up to it, and the symptoms would be a blower that could do any speed _except_ high. In your case it sounds almost like the relay got stuck closed, and couldn't _stop_ feeding the blower. Curiouser and curiouser...
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