300E heater problem

I have 300E and the fan does not go on, I toke the fan motor out and with direct power goes on but when is connected the power does not get to it, please give me some advise.
Thanks,
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fuse. switch. relay.
places to check.

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Did you check the fuse?
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I can not find the fuse it says is located out of fuse box but I can not find it

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