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The 2005 Buick LaCrosse doesn't have a fuse for the blower motor, but it does have a blower control module located inside the right side instrument panel insulator. The module is situated behind the passenger side dashboard, and you'll need to take out the center console to reach it. To check if it's receiving power and functioning correctly, you can use an OHM meter. Removing it requires disconnecting the electrical connector and the two heat stakes from the control module using a small chisel or flathead screwdriver. The cost of a new replacement blower motor control module can range from $25 to $50, depending on whether it's aftermarket or OEM.
The fuse for the blower motor in a 2005 Buick Lacrosse can be found near the blower motor underneath the center console.