Yesterday I had to cross a motorway with 10 km, my GR Y60 2.8 `94` 188000 mileage at about 120-130 km / h. I'm very tip showed the temperature jumped a red box. temp outside was about 24ST. As I left and drove a regular route is a temp dropped to normal and it was around for about 20 minutes I stopped and turned off the engine after 5 minutes I had to continue to drive temp was high and once again began to decline.
My questions:
1. Is this normal, I know the patrol does not like to ride fast and I will not?
2. Do I have a problem with the cooling system?

best regards-rradian