Hoses that break on 2.1L:
http://www.benplace.com/cooling_system_hoses.htm

-Z2, if you play around there, replace.
-T, at head junction.
-N, worse one
-L, second worse one, bypass hose, always very hot, always break near
-T-housing, go touch yours, feel it.
-The plastic coolant distributor between M and N and L, those are falling
appart.
-Sometime W and X

On 1.9L:
http://www.benplace.com/vanagon_digijet_engine_component.htm
Mmmm... not much, the 1,9 as way less hoses.

If i have to give some, well:
-N going to heater line.
-H shape plastic part at EX tank, but I (I) have seen that only once.
-Same Z3

If you are in the rust belt like I am, many metal coolant tube can be badly
corroded, like the long bypass one in between water pump and right head,
same for the 2 small one

1.9L 1 2.1L 0

Ben