I removed my dash already. I have to go to repair shop to evacuate freon since they charged the system and told me that evaporator needs replacement. I took out blower motor and found a lot of dirt and oily material on evapoator core on left side only. SHowed it to mechanic and he said to change evaporator. But I have a question for guys who did it already. My mechanic told me I have to pull out the whole box then disassemble it and replace evaporator core. Ive tried to pull on heater box with 4 nuts removed as per manual but it didnt move an inch. Do I have to remove the whole box with evaporator,heater core,flaps etc... or I disassemble box in-car. Get to evaporator, and replace it? Thank you in advance

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1999 ML430 Silver 135k ml
Smoked LED taillights, Alpine in-dash DVD player, 12" sub, Pioneer components, 2 amps, 4200k HIDs, ML55 headlights, 20" rims, mirror LED blinkers

SOLD. 1996 E320 145k ml. Burgundy

SOLD but miss it everyday 1992 500sel Black
Chime buzzer mod,Alpine CD/MP3 player with stock amp,Euro headlights,S600 grill,20" rims, BEST CAR EVER!

SOLD. 1990 300E White
187k ml,smoked tails,Euro headlights,17rims,Intake,12" sub in first aid kit,alarm/autostart,buzzer mod