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I have the same problem, I wonder if it could be one of the relays near the fan? Jim.

There is a rear blower motor relay module. It consists of two paired relays. These relays control rear blower speed based on speed input from the rear electronic module. You could check the operation of these two relays by switching the speed control and holding your finger on the relays. You should feel them change state. Also, check fuse 23 (40 amp) in the fuse box at the left side of the dash. This fuse supplies power to the relay coil circuits. If all of this is in order, then I would suspect the rear electronic module. I just had mine replaced for a different reason and it cost about 300.00. This must be done by Ford as the program from the old module must be downloaded and then uploaded to the new module. Yet another way to get money out of us.

As stated previously there are 2 relays that control the rear blower motor. I had the same problem on my windstar and found that one of the wires to the relay had broken. Repaired the broken wire and it was fixed.

2011-12-18 00:45:16
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