Heater fan runs continuously on 1999 Buick Regal

[Randy]

I have a 1999 Buick Regal with a unusual heater fan problem.

The problem is the heater fan runs at high speed even thou the fan switch is in the off position and continues to run when the ignition key is off and pulled out.

The fan stops once I disconnect the battery and does not come back on after the batttery is connected again. The fan switch seems to function normally most of the time. The heater fan problem seems to come and go.

I removed the knob from the fan switch and the fan switch is in the off position but has not affect on stopping the fan once the problem shows up.

Thanks

[Terryautos]

This is a common problem with a shorted out blower resistor.
It is located under the hood, on the topof the HVAC case. I believe i say a description of its locstion son this forum. Do a search for "Blower Resistor".