Chris,

I would recommend that you flush the coolant system as best you can, followed by a fill of 50% antifreeze.

I think the technicians reluctance to put in antifreeze must be based on some old wives tale.

Good luck,

------------------
Larry Bible
'01 C Class, Six Speed
'84 Euro 240D, manual, 533K miles
'88 300E 5 Speed
'81 300D Daughter's Car
Over 800,000 miles in
Mercedes automobiles