My 1.9 thermostat housing recently sprang a pinhole leak. Its behind the
flanged piece that contains the short hose connection to the cylinder
head. I suspect corrosion is the cause. I checked my records, I replaced
the water pump 4 1/2 years ago and approx. 20,000 miles ago. Questions:
Can I get that connector piece off without removing the water pump? If
not, should I replace the water pump while I'm in there or just re-install
it with new gaskets? Any advice?

Thanks,
Walter