A/C - Heater Blower Not Working

[Joshjd49]

My A/C - heater blower quit working in my 96 350. It will not blow on any of the speed settings. I have already replaced the switch and the resistor. After replacing these parts it still does not work. I have 9.45 volts going into the motor. I also took two jumper wires directly from the battery to the blower runs. Does any one have any ideas on what it could be? Thanks

[dazed01]

Find out where the voltage drop is. That voltage should run it slowly at least. Do you have - good ground to the motor?

[Joshjd49]

Where is the ground for the heater motor at?

The voltage was low because the switch was not on high. On high speed I read about 12 volts.

[Joshjd49]

Does any one else have any ideas? I am stuck at this point. Thanks

[dazed01]

I don't have a wiring diagram in front of me but I think the fan should get power from the connector that comes from a fuse and the it grounds through the blower resistor and the switch.

[Joshjd49]

I think I have a good ground if I am testing it the right way. I took my meter and figured out the the top wire in the connector is the ground and the bottom is the hot. So I took my meter and put one probe on the neg of the battery and put the other on the ground wire. I had contunity between the two. So if I am thinking right I should have a good ground to the motor.

Then for another test of the ground I used two jumper wires. The first one I went from the neg of the battery to the top (neg) prong of the heater motor. The second wire came from the pos side of the motor connector wire to the bottom (pos) prong of the motor and had no luck. If I am thinking right this should of made it run if I had a ground problem because I had a good ground in the test from the battery.

If you have any ideas please let me know. Or if any of the tests I tried are not the right way or work in this case to test the ground.

Thanks

[Joshjd49]

I still have not figured this one out. Today I got a brand new blower motor just to try it and it still does not work. This has me puzzled.

If anyone has any ideas let me know. Thanks