Hey jan,,, yeah they`re better than the stock early system as the by-pass can actually acumulate any air in the header tank, & then it goes to the bottom hoes,,, they have that funny moulded bottom hose

But it`s still not "optimum" in my books as there is still hot water """able""" to find it`s way back into the bottom hose , all-be-it -> not so easy as the std early system, so it`s at least a "Bit" better
I don`t think anyone will ever change my mind about the system we use tho
Minidna,,, welll,,, provided that you don`t shut off the heater tap (if you have one fitted) then all is "sort of" good-ish

,,, but you still have "fairly" un-cooled (except for the heater cooling it) water able to enter back into the engine,,, so it`s (again) at least better than straight out of the hot engine & back into the hot engine, so yes it`s "ok"-ish simply because it`s taken from the hot end of the engine & isn`t "too" disturbed flow.
I still prefer it to be cooled through the rad tho,,, it`s really not too hard to set up & is "Very" fool proof ... although i do know some dorks who havn`t got a clue even though i`ve spent hours with them talking & showing them about it
some mothers do have em hey???
