Hoses, pipes Volvo V70 II

Hoses, pipes

All connections, apart from those for the expansion valve and condenser, have double O-rings as a seal. The connections for the expansion valve and condenser have single O-rings.

The O-rings are manufactured in a specially developed material (HNBR = hydrated nitrile rubber).

Scheme 262

The air distribution system consists of

1. climate control system: blower fan damper filter recirculation throttle.
2. air ducts
3. vents.

Dampers control the outgoing air to

1. defroster
2. the dashboard vents
3. the floor outlets
4. the B post vents.

Fresh air enters the climate control system through the fresh air intake under the plenum chamber.

The fresh air intake is located

1. on the right-hand side of the left-hand drive vehicle
2. on the left-hand side of the right-hand drive vehicle.

Air enters the climate control system and is distributed by a large number of air vents to the passenger compartment. After circulating, the air leaves the passenger compartment via the evacuation valves in the cargo compartment.

Scheme 263

1. Temperature damper for controlling the heater element
2. Temperature damper upstream of heating element
3. Temperature damper downstream of heating element
4. Defroster damper
5. Ventilation damper
6. Floor damper
7. Fresh air damper
8. Recirculation damper.

Dampers controlled by damper motors are located in the climate control system.

1. Electronic climate control (ECC) has five damper motors
2. Manual climate control (MCC) has four damper motors.

There are eleven different dampers controlling the air flow of the climate control unit

1. Six temperature dampers for mixing hot and cold air. Three for the left hand side and three for the right hand side. On each side one damper (2) is installed before and one damper (3) installed after the heater pad. Together (1) and (2) control the amount of air to be heated and (3) guides the warm air to the correct vent
2. A floor vent for guiding the airflow to the front and rear of the floor
3. A defroster damper for guiding the airflow to the front windshield and side windows. NOTE: Electronic climate control (ECC) has a separate damper motor for the defroster damper.
4. A ventilation shutter for guiding the airflow to the dashboard and B post
5. A fresh air damper for controlling the flow of external air into the climate control system
6. A recirculation damper for controlling the flow of the air in the passenger compartment back into the climate control system.

By changing the direction of the dampers in the climate control system, air is directed through the various air ducts out to the passenger compartment.

The temperature is regulated by mixing hot and cold air. The temperature dampers on the right and left sides are controlled by a damper motor each. This makes it possible to have different temperatures on the driver's side and the passenger side.

The dampers are regulated proportionally to ensure that the passenger compartment achieves the selected temperature.

The fresh air damper is speed controlled, which means that the damper reduces the size of the hole to the air inlet the higher the vehicle speed. At speeds above 60 km/h the fresh air damper closes successively. At speeds above 120 km/h the fresh air damper is nearly completely closed. The speed control of the fresh air is to keep the airflow in the passenger compartment constant, irrespective of the speed of the vehicle.