The cap may not be new.
I will check the gasket with the sensor.
I know that the cap has a couple settings and Im not talking about that.
I am talking about the tanks neck where the cap screws down to it. The neck moves 1/8 of a turn, I thought that that was wierd. I have a coolant pressure tester. I'll hook it up to the cap and see what it does. Thanks for the replies.
No Benzes in the stable at the moment, but itching for one again.
Former Mercedes in the Stable:
1983 300CD Turbo diesel 515k mi sold
1984 300CD Turbo Diesel 150 k mi sold
1982 300D Turbo Diesel 225 sold
1987 300D Turbo Diesel 255k mi sold
1988 300 CE AMG Hammer 15k mi sold
1986 300E Amg Hammer 88k mi sold
1992 500E 156k mi sold