i put the one in with the 1/8" hole in the top, it cools fine when up to 205*, cools right down, but takes forever to get to operating temperature and the oil is to cold. Also, when run hard, the temp. gets down to 145* lol, im gonna try a very small hole in one and try that out... This is a real crapshoot as i know my waterpump in fact does pump water, its just the Tstat that sticks. One i had in there really stuck, had to keep it in 4th gear at 60 mph to keep the rpms up to stay at 201* !!!!! That was a nervous ride home from work.
It has to be air in there somewhere grrrrr.
-02 WRX Blouch 18G'd Juggernaut of Beastliness.