Radiator hoses don't just pop off... they are not only held in place
by a hose clamp, but also a "raised lip" that is molded into the
radiator fitting.
Remove the hose again and check if the end of the radiator fitting
has broken off... this will leave only a "straight" piece on the
radiator that the hose / clamp can clamp to and with enough pressure
the hose will simply slide off.
As for the side of the head, it is usually the plastic coolant flange:
http://www.germanautoparts.com/Volkswagen/Jetta/Cooling/117/11
There is a small coolant hose attached to the side of the cylinder
head... there's some white goo spraying down from it. Check to make
sure that that hose is not split.
Sputtering could be from the coolant / moisture that sprayed onto
your ignition components.
A wet distributor, ignition wires or ignition coil will cause sputtering
and loss of power... this should clear-up as the components dry-out.
Make sure that there is no goo in the coolant reservoir, if there
is, then you might already have some kind of head gasket / oil cooler
problem.
Thomas
Friday, October 5th, 2012 AT 4:09 PM