If just the power windows fail but the blower still works then chances are the power window switch assembly on the driver's door panel needs to be pulled out and have the contacts cleaned.
If BOTH the power windows and blower fail to work at the same time then the problem is the ignition switch. Common fail point. And can get messy because the ignition switch is riveted to the steering column.
If your dealer still claims nothing is wrong and both units are failing as mentioned then have him try the ignition switch several times to see if he can replicate the problem.
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