How do i change the belts on a 2004 kia sedona van

There is a tensioner pulley for each belt, you loosen the nut on the front of the pulley, then there is a tensioner bolt that you loosen, that will move the pulley away from belt to remove the belt. You'll need to get to them from the passenger side under the car. You'll need to remove the plastic covers to get them.

The garage has just changed our cam belt but we now have very noisy steering and won't start when cold, any ideas? They are saying car is fine when clearly not!