I searched but could not find this scenario. I have a leak around my coolant temp sending unit. Had it replaced and after one day it started leaking slightly until now it is puddling under the car when it gets cold. When the car is hot you can see the coolant bubling around the nut for the coolant sensor. wtf. Anyone know what needs to be done. This is a Big Bore car but higher RPM like 7500 shouldn't cause this or should it?