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Remove/install heater housing - AR83.25-P-1000MCU

MODEL 451.3/4 except CODE (I01) Air conditioning Plus 

Fig 1: Identifying Heater Housing Remove/Install Components (1 Of 3)
G10979012Courtesy of MERCEDES-BENZ USA
Fig 2: Identifying Heater Housing Remove/Install Components (2 Of 3)
G10979013Courtesy of MERCEDES-BENZ USA
Fig 3: Identifying Heater Housing Remove/Install Components (3 Of 3)
G10979014Courtesy of MERCEDES-BENZ USA
REMOVINGINSTALLING Remove/install     
1 Remove front CBS   AR88.00-P-1010MCC
2 Drain coolant   AR20.00-P-1142MCU
3 Release click clamps (1) on coolant hoses (2) and then remove    
4 Remove crossmember below instrument panel   AR62.30-P-1250MCU
5 Disconnect heater or AC connector (X85/10)    
6 Place right front floor covering in area of heater housing (3) to one side    
7 Unclip retaining clip (6) of electrical wiring harness (7) on heater housing (3)    
8 Place left front floor covering in area of heater housing (3) to one side    
9 Unscrew nuts (4) on heater housing (3)    
10 Remove heater housing (3) from firewall and route to the rear until the coolant hoses (2) are accessible    
11 Detach coolant hoses (2) NOTES Make sure that the interior is not contaminated by any escaping coolant, as contaminated parts will have to be cleaned or replaced.
IMPORTANT Note installation position of coolant hoses (2).
INSTALLATION IMPORTANT Position click clamps (1) on coolant hoses (2), slide coolant hoses (2) onto connections on heater housing (3) and fasten click clamps (1) in place.
Position openings of click clamps (1) such that they face upward or to the right and that they do not come into contact with the coolant hoses (2).		  
12 Remove heater housing (3) from vehicle NOTES Make sure that the interior is not contaminated by any escaping coolant, as contaminated parts will have to be cleaned or replaced.  
13 Detach fresh air case (11) from the heater housing (3) by turning and remove When replacing the heater housing (3).  
14 Detach electrical connector (9), release lock and detach blower motor (M2) by turning it counterclockwise and then remove from the heater housing (3) When replacing the heater housing (3).  
15 Detach electrical connector (10) and release series resistor group for blower motor (R14) by turning it clockwise and then remove from the heater housing (3) When replacing the heater housing (3).  
16 Expose electrical wiring harness (13) on heater housing (3) and remove When replacing the heater housing (3).  
17 Remove bolt (5) and remove cover (8) When replacing the heater housing (3).  
18 Pull heat exchanger (12) out of heater housing (3) When replacing the heater housing (3).  
19 Install in the reverse order    
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