hehehe - i lost 2.5L of coolant 2 nights ago when my PS pulley sliced a nice hole in that hose...
reason: i had the radiator out earlier in the day, and when i put the hose back on, i had it twisted ever-so-slightly on the bottom rad mount, pushing the hose close to the pulley.
i bought a new hose yesterday and made sure it was fitted to the rad outlet differently, and now theres a good 20mm clearance.
make sure theres nothing under the hose pushing it closer to the pulley also.