Pressure test -- leaks are obvious by drips or hissing.
I would guess you do not have a functioning main fan -- they have an electric clutch on that model, and you are only getting cooling from the electric fan, hence heating to 95C or so up and down.
If the fans work properly, and there are not leaks, I would verify that the radiator is not clogged, and if it is, replace it. Also check the water pump -- if someone has been using green coolant in it, the impeller is likely corroded and hence the coolant doesn't circulate properly.
Peter _______________________________________ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
