Having problems with your 2000 Mercury Grand Marquis ?
Mercury 2004 Grand Marquis blend door failure
Replace the blend door motor, unless the blend door itself is broken then theres a replacement door or box that need to be installed, this is a big job, the dash needs to be removed to do this job and ac system drained of freon with an ac machine.
Repair Help & Product Troubleshooting for 2000 Mercury Grand Marquis
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