Chances are that the blower resistor is blown. The resistor is located on the bottom of the blower, located in the passenger side footwell. If the problem is with the resistor them the blower will only work on high speed, other than that it might be a broken wire.
tested blower,ok. then tested incoming voltage to blower and found to be zero. the final step was to replace the blower switch. To replace that switch, the middle part of the dashboard, including the radio had to be removed. The ac and heater come in one piece. It worked fine then. I think, there is a chance that the switch could be just cleaned up and it would work, again I think.
You can unplug the blower motor and run a jumper wire to test the blower motor. If it is grounded through the plug you'll have to run a ground wire to it also. Blower Motor tested good. The Problem was the Blower Motor Controller which was located on the firewall just below the Heater Hoses. Thanks for responses to question.
Should under dash on firwall near blower motor.
On some years, there are 2 separate fuses, one for the switch and another for the blower motor. First make sure fuses are good, if all is good, the blower motor is located under the hood, pass side at firewall. There should be a purple wire going to the motor, on the high blower motor setting there should be 12v at that wire. If 12v is available at the purple wire, make sure your ground is good (blower motor ground is at the motor case - black wire attached). If both are good, most likely cause would be the blower motor itself. If 12v was not present at the purple wire, likely causes are the blower motor relay (which is found just above the blower motor), mode switches ie. vent/blend/defrost etc. (if 12v is not present after the switch - poss colours brown or brown with a white stripe) or blower motor switch ie. high/med/low fault.
The Blower resistor should be tested which is located near the blower motor, the resistor is probably faulty.
I tested mine by putting wires with alligator clips on the blower's terminals and touched the other ends to my battery.
If you have only high speed on the blower motor or you are missing one or more low speeds, chances are the blower motor speed resistor is burned out.
Check the fuses and blower relay. Also check to make sure that the replacement blower motor has not failed. If these items are good then the electrical system will need to be tested to see where the blower system is losing power.
Well ,A Few thing,s,First the A/C and heater blower share the same function, If your sure the blower is defective, it,s probly at the end of it,s usefull life, . If your not sure, Remove it and have it tested.
Either than switch, the resistor, or the relay is bad. On my 1999 Buick Century, the blower motor quit working on the three lower speeds, and then went out completely. When the resistor goes bad, the lower speeds quit working. My blower motor was squealing, also. After I replaced the blower motor and the resistor, I tested it and found the blower worked great on every speed but high. It turned out that there is a separate circuit for high speed, and the fuse was blown. I replaced the fuse for the high speed, and the blower now works on all 5 speeds. Replacing the blower and resistor was difficult, but not as bad as expected, thanks to help from this site.
Yes but the vehicle is under warranty and you need the dealer to repair this for you free of charge, don't mess with it because you will void out the warranty........
The blower motor resistor is the common failure. It comes with the wires attached that plug directly to the blower motor itself. If there is another wiriing harness that is damaged then you will have to buy it too. The resistor failure has been linked as the only cause of the melted wires other than the blower motor itself. The motor can be tested with 12v power to it and it should run on high speed when tested.