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blower motor is good and fuse is good could it be a relay or resister and where are they located
Does your vehicle have "automatic temperature control" - the digital set temperature? If so, the failure is likely an issue with the blower speed controller.
If it's manual temperature control, it's a resistor issue.
Q&A > Mercury > 2004 Mercury Grand Marquis
Q&A > Mercury > 2008 Mercury Grand Marquis
Q&A > Mercury > 2001 Mercury Grand Marquis