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The air temperature blend door is jammed and this is causing the blend door motor to "skip". REMOVE THE DASH ASEMBLY AND REPLACE THE BLEND DOOR AND THE ACTUATOR.
The blend-air door actuator on a 2008 Merury Grand Marquis is located on the top forward area of the HVAC housing under the instrument panel. Complete instrument panel removal is required to access it.
sorry but it can not be done, you will need to replace the blend door motor, it is in the top of the air handler box, you will have to remove the dash to get to the motor....good luck
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.
probably has a bad belend air door motor, to run the systen completely through its self diagnosis process" if has electronic auto temp control" press."off "and "floor" at the same time release... then hit the "auto" button wait til gives you code...... it will then "SOMETIMES start WORK normal til moved again by you..... if manual, change hot to cold, listen carefully for clicking ...if clicking rplave blend door motor and inspect the plenums door while motor out
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