1. Removing and installing heating device (for 190) (1) Drain the coolant in the cooling system. (2) Remove the control panel. (3) Separate the cable fixing piece on the left side of the heater and remove the screw on the terminal. (4) Pull out the wire connector behind the blower motor. (5) Disconnect the vacuum tube and lighting line behind the heater control device. (6) Place a container under the heater water supply pipe behind the engine and cylinder head. (7) Disconnect the heater water supply pipe behind the cylinder head. (8) Remove the heater return hose on the thermostat housing, insert the pedal pump hose into the heater return pipe, pump the cooling water from the water supply pipe into the container, and blow out the residual cooling liquid in the heater. (9) Remove two connecting bolts, and then separate the oil return pipe. (10) Pull out the right air pipe under the heater oil return pipe. (1 1) Remove the two bolts on the other side and separate the water supply pipe on the flange joint. (12) Pull out the air pipe under the water supply pipe on the left side of the heater. (13) Remove the water supply pipe bracket on the left side of the firewall. (14) Loosen the mounting bracket nut under the water supply pipe bracket. (15) Loosen the right mounting bracket nut under the return pipe. (16) Remove the two mounting nuts at the top of the heater, as shown in figure 16- 1. (17) Disconnect the control line of the blower motor switch. (18) Disconnect the control line on the main damper on the heater side. (19) Separate the heater from the mounting stud, then lift it up and remove it from the vehicle. (20) Install in the reverse order of disassembly. However, it should be noted that when connecting the blower control line, it is necessary to first connect the line to the switch, then move the switch to the "MAX" position, connect the control line end to the main damper arm, open the main damper and reach the top, and then locate the external cable; After all the work is completed, add coolant as needed. [on] two. Removing and installing heater water tank (model 190) (model 1) Remove the heater according to the above requirements and steps. (2) Remove the spiral lamp on the air inlet of the heater. (3) Carefully pry open all the fixing clips of the heating device. (4) Press out the linkage mechanism of the left and right dehumidification dampers. (5) Push back the lock of the left dehumidification damper. (6) Pull out the left and right joint pads with the dehumidifying nozzle. (7) Press the connecting rod of mixed gas damper on the left and right arms. (8) Lever out the ball heads of the connecting rods of the left and right mixed gas dampers from the ball seats. (9) Divide the heating device into two halves, and remove the mixed gas baffle. (10) Remove the fixing screw of the heater water tank frame, remove the frame and take out the water tank. (1 1) Install in the reverse order of disassembly. [on] three. Disassembly and installation of heater blower motor (1. 190) Remove the air inlet cover above the air pressure chamber. (2) Remove the vacuum hose on the water tank valve. (3) Remove the two screws indicated by arrows on the blower motor cover. (4) Lift the rubber sealing strip away from the internal firewall, and then remove the two fixing screws. (5) Move the firewall upward and forward, and then remove the blower motor cover. (6) Remove the wire connector, and then remove the motor wire connector. (7) Remove the fixing bolt of the blower motor, and then take out the motor from the housing. (8) Install in the reverse order of disassembly.
2.240D, 230, 280, 280C and 300D heater motor disassembly and installation.
(1) Remove the heater box.
(2) Remove the three fixing screws.
(3) Pull out the blower gently, then disconnect the wire plug and remove the blower.
(4) Install in the reverse order of disassembly. In order to prevent air leakage, three new screws and new washers should be used during installation.
3.280E, 280CE, 300CD and 300TD heater motor disassembly and installation.
(1) Remove the cover from the lower right side of the instrument panel.
(2) Remove the wire plug from the blower motor.
(3) Remove the screws of the contact plate, lift the contact plate, and then disconnect the wires connected with the series resistor.
(4) Remove the flange fixing bolt of the blower motor, and then lift it away from the blower motor.
(5) Install in the reverse order of disassembly.
4.280S, 280SE, 300SD, 450SE, 450SEL and 6.9 blower motor disassembly and installation.
(1) Disconnect the series resistor plug on the firewall.
(2) Remove the fixing bolt, and then remove the series resistor.
(3) Remove the air intake grille, and then remove the glove box.
(4) Remove the cover from the lower right side of the instrument panel.
(5) Remove the hose between the central air pipeline and the right annular nozzle.
(6) Remove the clamp, and then remove the control line on the rocker arm.
(7) Remove two nuts, and then remove the blower motor.
(8) Lead the connecting wire into the water tank through the air pipeline on the firewall.
(9) Insert the blower motor into the housing, screw on the fixing nut, and then push the motor to the left.
(10) Install in the reverse order of disassembly.
5.380SL, 380SLC, 450SL and 450SLC blower motor removal and installation.
(1) Remove the eight fixing screws of the outer cover, and then remove the motor cover.
(2) Unplug the wire plug from the series resistor on the firewall.
(3) Remove the fixing bolt, and then remove the series resistor.
(4) Unscrew the four fixing nuts of the blower motor, and then take out the motor.
(5) Install in the reverse order of disassembly. It should be noted that the rubber sealing strip cannot be damaged, otherwise it must be replaced.
6.300SD, 380SE, 380SEL, 380SEC, 500SEL and 500SEC blower motor disassembly and installation.
(1) Remove the cover on the lower right side of the instrument panel.
(2) Remove the cover plate from the blower motor, and then remove the two-pin plug.
(3) Remove the fixing bolt of the blower motor flange, and then remove the motor.
(4) Install in the reverse order of disassembly.
7. Disassembly and installation of190d and 190E blower motors.
(1) Open the engine cover by 90, and then remove the wiper arm.
(2) Remove the fixing clip of the firewall air inlet cover.
(3) Remove the rubber sealing strip from the cover, and then remove the fixing screw; Slide the inlet cover out of the lower windshield adjusting strip and remove it.
(4) Disconnect the vacuum hose from the heater tank.
(5) Remove the fixing screw of the heater water tank cover.
(6) Pull out the rubber sealing strip from the forced ventilation engine side of the defroster, then remove the fixing screw and pull out the blower motor cover.
(7) Untie the connecting belt connecting the wires, and then remove the plug.
(8) Remove the mounting bolts, and then remove the blower motor.
(9) Install in the reverse order of disassembly.