Hi Fred:

Thanks for your post.

I am looking at the MB box the thermostat came in, and it doesn't say what temp it runs at. I don't want to take the thermostat out if I don't have to. I've also looked at the old MB thermostat I took out and it doesn't have the temp on it.

I'm pretty sure I installed the new thermostat correctly. The car runs fine until I encounter THE HILL! I refilled the fluid with new 50/50 coolant.

Good point about the cap for the expansion tank. When the fluid boils, the cap appears to be fine, because the fluid leaks from the small valve on the side of the expansion tank.

Any other suggestions?

Thanks again Fred.

__________________
Dr. Brad

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