I am in the midst of replacing the evaporator and 6 vacuum servos on my 1993 400E. The dash and cross brace have been removed. The clips holding the top and bottom halves of the ac/heater box together have been removed. Although the two halves of the ac/heater box have separated on the cabin side of the box, the firewall halves still seem firmly joined. How does the box come apart? Does the heater core need to be removed for the evaporator replacement. Thanks.

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