my air conditioner blower motor works sometimes but not others what do i check on 2002 Cadillac Seville STS

can only get it to work on occasion but rear air works fine

Asked by for the 2002 Cadillac Seville STS
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1) connection at the blower motor. 2) blower motor resistor ( or module )
Where and how would I check that connection? I have the same problem in my 2001 Seville.