HI
I have a engine coolant leaking
the leak is in the hosing cover (right there in the thermostat)
is coming from the lower bolt
all ready repair put some high temperature silicon but the leak is there

 

The thermostat housing is just weak plastic. I broke mine at the flange last time i changed my thermostat just from tightening the bolts. At your local auto parts store the should run between $10.00-15.00,they willcall it a "Water Outlet"