Hoses, crack and deteriorate from the inside out. And should be replaced
 every 2 to 3 years! They will look great on the outside, and be cracked to
 pieces on the inside. At the very least I would remove one end and inspect,
 pinch while off and look for cracks on the inside. Check the water pump
 shaft for "play" and the weep hole for leakage, replace if needed. Replace
 any belts with cracks, about the same as the hoses. Save the old belts and
 hoses for carry in tool box for spars!

 Good luck!

 Howard

 >>Is there anything else I should replace- even though it looks ok-  while
>the system is empty?
>