In the cab of a car with three rows of seats, an additional heater is located on the floor behind the passenger seat (or under it)
In buses, an additional heater is installed on the floor under the seat in front of the passenger compartment.
The auxiliary heater is operating in indoor air mode.
Repeated passage of internal air through the heater radiator provides a high intensity of heating of the cabin (interior).
The auxiliary heater device is shown in the figure.
In the heating system of these vehicles, an electric pump is used, which provides an increase in fluid flow in the system, which improves the heating of the cabin (interior).
Removing the auxiliary heater fan motor
Using a slotted screwdriver, unscrew the two screws securing the additional heater guard.
Removing the fence.
Disconnect the plug from the heater motor.
Using a key or a “7” head, unscrew the two nuts securing the wires and disconnect them from the terminals of the motor resistor.
While holding the bolts of the motor cap from turning with the “10” key, unscrew the four nuts with the same key
Remove the cap along with the electric motor
A rubber sealing ring is installed between the cap and the heater casing
Remove the electric fan from the cap.
Use a screwdriver to unscrew the two screws
Remove the impeller from the motor shaft.
With the key "on 8" we turn off two fasteners
Remove the motor flange and rubber seal
Using the “10” key, we unscrew the two fastening bolts
Remove the motor resistor
Having replaced the defective parts, we assemble and install the electric fan in the reverse order.
Removing the auxiliary heater radiator
Drain the coolant (see Replacing the coolant) .
Remove the electric fan.
Using a screwdriver, loosening the clamps, remove the hoses from the additional heater radiator pipes
Using the “12” key, we unscrew the two bolts securing the radiator shroud to the bracket.
Remove the radiator of the additional heater with the casing.
It is attached to the bracket through rubber washers and steel bushings
Use a screwdriver to “snap off” the two fastening brackets
Remove the casing cover
Remove the second cover in the same way.
“Snap off” two more fastening brackets…
Having disconnected the halves of the heater housing, we remove the radiator from it.
When replacing the radiator with a “19” key, we unscrew the plastic pipes from it and, if necessary, rearrange them to a new radiator
We install the radiator in the reverse order, after which we fill the cooling system with liquid.