AC Control Switch Only Works on High 2001 Voyager Climate Control

When the blower works only on the high setting its usually a bad blower resistor which is right near the blower motor. now you say it would always blow high regardless of the fan speed setting that would indicate probably the climate control unit or a connector problem somewhere. finally it not working at all may be the climate control unit or connection went bad even further. it might have a blown fuse or a bad blower motor in addition to the climate control unit or connector problem .check for power and ground at the blower motor. the power is supplied from fuses and may have a relay also. the ground is supplied from the climate control unit and goes through the resistor to control the fan speed. good luck

Often when they only run on high, it is the fan switch that needs replacing.
On the lower speeds the voltage runs though some resisters to slow the fan, on high its a direct contact

Good Evening, If I am translating this properly your fan only works on the high setting? And the other settings do not change the speed? If this is correct respond back and I will help as much as possible.

there is a mosfet power transistor that drives the fan.it is probably shorted,applying full power to the fan at all times,even if the climate control is off

There is a resistor switch that controls the fan speeds. When it shorts out it defaults to high speed only. It is not too expensive and is not very hard to replace. It is located adjacent to the blower and has an electrical hook up to it.

Hope this helps.

The pontiacs have an issue with the ignition switch, I have a 2001 grand prix that did the same. The ac fan would only work on 5 and the headlights would go off if on 1-4 replace the switch and all is fine.

could possibly be a vaccum leak

I had the same problem twice. The dealer said it was a recall for a bad fan control switch. It's located under the glovebox near the center of the dash and held in by two screws. Last time i had to replace the part was about 34.00 and did it myself. The cover under the glovebox pops out and you can see the part. They had problems with them burning out and only work on high after that happens.

It's relay is not doing work. Check that & change that.

Your problem is probably a part called the heater resistor block or board. When this part burns out you will only have high speed on the fan. On my 1999 voyager it is located on the firewall and it snaps in a hole in the firewall. This is under the hood behind the alternator.
Mine had a multi pin black plug plugged into it. Unplug the plug and
you should be able to pull the block out insert new block and plug plug back in and it should come to life.