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temperature control unit fan question...1996 sig.limited

My auto control works sometimes on heat or a/c in auto mode.Most of the time I have to put the wheel all the way up to get the fan blowing.Do I just need to replace that whole unit??In the summer when the a/c is on the auto mode would come on for a few then go off.While I'm at it,how hard is it to replace the fuel lines under the hood??They look/are rusty.

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