Hi J:

Many thanks for your suggestion. I know it gets a lot hotter in Toronto than in Vancouver.

I will swing by MB tomorrow and pick up a new cap and see how it affects my problem.

Things were pretty good today. It was about 20 degrees today and cloudy. The temp guage fluttered a bit. While driving for the first 10 minutes it hovered just less than 80 degrees, then spiked to above 100 degrees, then settled to just over 80 degrees. When I came to the hill, it stayed at just over 80 degrees, until I got three quarters the way up the hill (about 1.5 km) then it spiked to just over 100 degrees. It stayed there and didn't boil.

Any other suggestions before I consider pulling out the rad?

Many thanks again to everyone!

__________________
Dr. Brad

2003 C320 4Matic Station Wagon
2002 C240 Elegance
1982 380 SEL Star Certified