Just rebuilt my fiesta rs turbo had some teething problems, but the annoying one i cant seem to cure is the water one. It overheated on the first test drive which was due to the radiator being blocked, so a new one was fitted. Then it still ran at over 100 so i took the stat out, hoping that this would cure it and it did. It ran fine like this for a few weeks so i put in a new stat and it runs at 100 exactly on my gauge. It has had three diffent stats in and are all doing the same thing, But i have noticed when the stat is in i dont get much return flow comming back to the header tank. Has anybody come across this before

 

100 what??? my car runs at 200f before the fan kicks in

 

sorry 100 degrees c the fan switch and the thermostat are both 98 degrees c