I don't think it would HAVE to be replaced. If it's not there, it won't blow the new climate control unit. But it's always best to have everything put back the way it was designed, in spite of the fact that climate control is not one MB's strong suits from a design point.
Good luck,
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Larry Bible
'84 Euro 240D, 523K miles
'88 300E 5 Speed
'81 300D Daughter's Car
Over 800,000 miles in
Mercedes automobiles
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