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Showing 200 on the gauge while on the highway is to be expected if you're running a 195 t-stat. Now if he was running a 180 t-stat and doing 200 on the highway, then I would say your cooling system does need some attention.



]I have the same problem. Trying to get some miles on new engine. I have a high volume alum waterpump, mancini alum rad, 195 stat. On short ride today engine was about 210-220 when I got home. Shut off engine and it started to run by itself, plenty hot.

I read where a high volume pump would keep the thremostat from opening. Anyone heard of this?

I didn't have any problem with it overheating on breaking with no stat. I don't have a shroud yet.

Any ideas?