I believe you mean "BI-LEVEL" mode, which means it should blow air simultaneously out of the dashboard registers and the lower register. The Temperature of the air blowing out of both of them is regulated by the temperature preset.
Does the fan still blow when you move the switch to BI-LEVEL? If it does but the air comes out of the DEFROST registers, that means your diverter is not functioning correctly, most likely due to a vacuum leak under the dash. If the fan shuts off in BI-LEVEL mode but still operates in HEAT mode, your selector module is bad. If the fan shuts off in BI-LEVEL mode and in HEAT mode, either your engine coolant is not hot enough to provide heat (automatic function), or the temperature sensor for your climate control system has failed.
SOURCE: 1998 Oldsmobile Intrigue-no heater or a/c fan blowing
either your blower motor is bad or your switch is. You can run a jumper to the motor and see if it kicks in. If that works then run a jumber from your switch to your motor and see if that works. Both are easily replaced, and don't take long.
tepfy
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