2005 pontiac grand prix, blower motor has been tested and Sep 28, 20122005 pontiac grand prix, blower motor has been tested and replaced as well and blower motor resistor. Motor does not kick on by itself. However, cooler weather or "bumps" can cause it to kick on or off. Blower Motor Not Working On 2005 Pontiac Grand Prix The blower motor stopped working in my '05 Pontiac Grand Prix. Using my volt meter, I checked for voltage at the blower. With the fan set to the highest setting, I saw 12 volts so I thought the blower motor was bad replaced it. The new motor ran for 5 seconds then stopped. Still getting 12 V at highest setting and 6V at lowest fan setting.
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