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Pic. 40. Heating and ventilation of the car interior: 1. Bracket for fastening the heater casings; 2. Heater control damper; 3. Left heater cover; 4. Leg warmer damper rod; 5. Radiator seal; 6. Radiator; 7. Heater sealing gasket; 8. Electric motor; 9 Fan shrouds; 10. Fan impeller; 11. Heating damper; 12. Windshield heating air duct; 13. Air duct side nozzle; 14. Side nozzle; 15. Damper of the central nozzle; 16. Pusher blades; 17. Blade axis; 18. Shoulder; 19. Central nozzle overlap lever; 20. Thrust damper heated windshield; 21. Lever for changing the direction of the air flow; 22. Air heating control handle, 23. Windshield air supply handle; 24. Air supply handle to the legs; 25. Arm of control levers; 26. Bracket for fastening the thrust shell; 27. Crane control rod; 28. Thrust damper control heater; 29. Foot warmer damper; 30. Axes of air heating control levers; 31. Coupling screw clamp; 32. Heater tap valve; 33. Valve body, 34. Valve lever; 35. Hoses connecting the tap to the heater radiator; 36. Air duct for internal ventilation; 37. Windows for heating the legs of the rear passengers; 38. Heater tap; 39. Window for heating the driver's legs; 40. Facing the central pillar; 41. The inner cavity of the central pillar; 42. Exhaust air duct; 43. Upholstery of the central pillar; 44. Facing of the exhaust ventilation deflector; 45. Rubber valve; 46. Deflector housing; 47. Exhaust ventilation deflector; I. Heater; II. Scheme of the heater; III. Heater tap; IV. Exhaust ventilation of the passenger compartment of VAZ-2108 and VAZ-2109 cars.
Interior heating is provided by air heated in the heater radiator 6, which is included in the engine cooling system parallel to the main radiator. The heater is mounted in the passenger compartment under the instrument panel with four nuts to the bolts welded to the air intake box. The air heated in the heater is directed to the cabin through the system of air ducts attached to the bottom of the instrument panel and through the air duct 36 of the internal ventilation. The air ducts are sealed with the heater with gaskets.
The heater consists of the right and left 3 plastic casings of the heater, which are interconnected along the perimeter with 1 fastening brackets. To seal the casings, a special tourniquet is laid in the grooves.
For forced air supply to the passenger compartment, an electric fan is attached to the top of the heater with two screws. The design of the heater allows you to remove the electric fan from the side of the engine compartment.
The electric fan consists of two plastic casings 9, to which an electric motor 8 of type 45.3730 is attached. The impeller 10 of the electric fan is mounted on the motor shaft. To obtain the required speed of the impeller, there is an additional resistor, which is fastened with a screw on the left side into the hole in the heater casing 3. Two spiral resistors provide three speeds of rotation of the impeller.
The air heating radiator 6 is installed in the heater casings, fastened with three screws to the right casing and sealed with polyurethane foam gasket 7. The heater radiator consists of two rows of tubes, cooling plates and two plastic tanks.
The heater valve is connected to the cooling system with rubber hoses. The circulation of liquid through the radiator is carried out by the pump of the cooling system. The valve consists of a body 33 with two pairs of nozzles. In the valve body on the supply line on the axis, a plate valve 32 of the valve with a hole for passing the coolant is installed. The lever 34 of the valve is connected by a rod 27 to the lever of the handle 22 for controlling the air heating. When the lever 34 is turned, the hole in the valve 32 opens the line for fluid to enter the heater radiator.
The heater is controlled by three handles 22, 23, 24, the levers of which are mounted on the axes of a plastic bracket 25, fastened with four screws to the instrument panel. The air heating control handle 22 acts through the rods 27 and 28 on the valve lever 34 and the damper control lever 2 of the heater control. When the handle 22 is fully moved to the right, valve 38 and damper 2 open, air will be supplied by an electric fan through the radiator 6 of the heater, in which the heated coolant of the cooling system is driven. In the middle position of the handle 22, the valve and damper 2 will be in intermediate positions, the air will pass both through the radiator and bypassing it. This ensures the required degree of air heating more reliably. At the extreme left position of the handle 22, the valve 38 and the damper 2 of the heater control are closed, while the air supplied to the passenger compartment will not be heated.
The upper left handle 24 for supplying air to the legs of the driver and passengers is connected by a rod 4 to the damper lever 29. When the handle is moved to the left, the damper for heating the legs opens, the air is directed from the heater casings to the windows 39 on the left and right sides to the legs of the driver and passenger in the front seat, as well as through the internal ventilation air duct 36 to the legs of the passengers in the rear seat.
The handle 23 for supplying air to the windshield is connected by a rod 20 to the damper drive lever 11 for heating the windshield, which blocks or opens the way for air through the air duct 12 to the glass (see heater operation diagram).
The heater has left and right side nozzles 14 and two central nozzles to supply air to the passenger compartment directly to the passengers and also to blow the side windows of the car. A damper 15 with polyurethane foam seals is installed in the body of each nozzle. By opening or closing the damper by the lever 19, the intensity of ventilation is changed. The direction of the air flow is changed by the lever 21, which allows you to turn the nozzle with guides, as well as the blades, to the desired position.
The heater provides an average temperature in the cabin at an outside air temperature of minus 20°C in the maximum heating mode - plus 20°C, and in the foot area - plus 25°C. The cars have exhaust ventilation, which ensures the suction of air from the passenger compartment. On VAZ-2108 cars, air is sucked into the gaps under the roof upholstery (mostly from the rear) and enters the internal cavities 41 of the central pillars, then through the rubber ducts 42 and holes in the rear edges of the facings 40 goes out. Suction is carried out due to the rarefaction that occurs when the car is moving at the rear edges of the facings of the central pillars of the body.
On VAZ-2109 vehicles, exhaust ventilation is made behind the body openings for the side windows. Ventilation is also carried out due to the rarefaction that occurs at the deflectors 47 when the car is moving. The air is sucked out from the rear part of the passenger compartment under the lining 44 of the deflectors, squeezes out the rubber valves 45 and exits through the openings of the deflectors. Rubber flaps 45 prevent outside air from entering the cabin in crosswinds.