my 2002 town and country problem

my daughter was driving and the van heat and start smoking, she park and
i go to put coolant, and we drive for couple miles and heat again and i do
the same wait and put coolant againg, but all the way the van was sheking
and really weak like with no strong at all, my husband check the van the
water pump was bad and now still shaking and the engine light is on grrrrrr
can some one help and see what we can do? thanks