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Hi, new 2005 GT owner, Blower Motor does not operate in any mode: A/C, Heat or defrost. I checked all related fuses. Could it be the Blower Resistor?
 

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I believe blower motor would work on high speed even if resistor were bad.

Fuses related, not including a/c would be...these inside car fuses...fuse 12, 5amp, fuse 10, 5 amp, fuse 19, 5 amp, fuse 3, 10 amp. In underhood fuse box, fuse 1, 30amp, also blower motor relay in same fuse box.

There have been incidences of climate control module (in dash part which has fan switch within itself) being bad, yet this is a rarity.

Do check as >08' Mustang Dude< states...for power at blower motor connector. This is a two wire connector which goes up vertically from under blower motor housing. One wire is pink/white, other wire is orange/black.
If there is power there then blower motor is bad. Very easy to remove blower motor if necessary to check it off the car.

There have been problems, others have stated, with water intrusion into a 40 pin connector, causing corrosion within. This would be something to check if no power to motor after all of above things have been checked.

This 40 pin connector is located behind the passenger kick panel, and to the right of the smart junction box. Must remove rh door sill plate and then rh plastic kick panel to view this connector. Connector is very light grey in color with a white clip handle attached. Clip handle releases halves of connector. Then one can view interior of 40 pin connector to check for corrosion or overheating on any terminals.

Two wire connector to blower motor is C2066
40 pin connector behind kick panel is C210

Note: wanted to remove one of the tech illustrations below yet have no clue how to do so.
 

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