I replace the alternator in my 2000 Altima afterwards the cooling fans want come on 2002 Nissan Altima

what would cause me to have no heat and cooling fans not come on

Asked by for the 2002 Nissan Altima
2 answers
you have belt routing rite,,?? maybe popped fuse if u crossed or sparked wires somewere??
Is it overheating? Low coolant now?