Does the dashboard have to be removed access heater blower motor in a 1992 Pontiac Grand AM?

In most 1992 Pontiac Grand Ams, yes, you will likely need to at least partially remove the dashboard to access the heater blower motor. It's rarely a simple job. The blower motor is typically located deep within the dashboard assembly, requiring removal or significant disassembly of parts of the dash to reach it. There are some variations depending on the exact trim level and options, but it's generally a significant undertaking. A shop manual for your specific year and model will give the most accurate information.