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Toyota sienna A/C fan

2003 Toyota sienna A/C fan go on and off by its self, still showing that the fan is running. Then it will come back on then off again this had been going on for quite a while now.

It could be a bad blower motor, but it more likely to be a loose or corroded connection somewhere.

Does it do this on all speed settings, or just the lower ones?

I believe if it was a bad motor it would have quit by now, is there a thermo overheat protection in this vehicle.
It will happen when I am not moving, so I don’t believe it is a loose connection.
Any speed setting .

I would not rule out a bad connection that fast. Note: the question about what speed settings is important.

Any speed setting .