Try cutting it off by control panel , replace blower motor .
Sounds like closed circuit or a short because the egnition is a master shut down and if it gets through that then ther seems to be a short bypassing the egnition
SOURCE: 1996 buick riviera blower motor will not shut off
The blower motor control module needs to be replaced, that will solve the problem. The module is underneath the hood on the firewall in the back. It has 2- 6mm screws. Unplug it, pull it out, put the other one back in. Plug it in. This is common for this model buick.
SOURCE: Blower motor vent selection switch not working
the hvac selector switch in the dash may be the problem.You need to remove the switch and look at the connector on the back of switch,see if there are any burnt wires at the connector or switch.It's all electronic and the switches have been known to burn out on this and other model.
SOURCE: 1993 Buick Lesabre Limited A/C problem
disconect the negative battery cable from battery for 20 seconds and replace cable back,then try ac let me know if this helps u
SOURCE: how do I replace blower motor for heat and air
Removal Procedure
Installation Procedure
Notice: Refer to Fastener Notice in the Preface section.
Tighten the screws to 1.7 N·m (15 lb in).
SOURCE: AC/heater blower/fan is not working.
when i turn the ac on the fan is very loud like there is something in it or it is about to go out
Service VME - HVAC Blower Continues To Run with Key Off
SERVICE VME
Some 2003 Full-Size Pickup / Utility A/C blower motor continues to run even when the key is removed from the ignition. The root cause is an internal failure within Linear Power Module ( LPM ) or also known as the Blower Motor Control Processor. The service fix is to replace the LPM (P/N 52495874).107 views
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