Quote Originally Posted by Tubbs76 View Post
Cheers for that, much appreciated. I dont think it is the issue though. seems to open same time, fan coming on same time. Im gonna drop it on weekend, flush out and re fill with the coolnt i was using. only way to determine. system has been bled and re bled, no leaks anywhere, new everyhting. The only thing i havemt changed is the expansion tank. Which Im gonna do anyway after xmas..
For the purpose of comparing the 2 coolants as you going to, you should use the same expansion bottle. Or just try a new expansion bottle with the coolant you have in now. You can also have a mechanical problem (cyl. head gasket, corrosion?)