Geely EC718, EC718RV, EC715, EC715RV. Manual part — 334

Outside temperature sensor is located in the vehicle front grille
below the front bumper area. Air-conditioning control module
uses this sensor to learn the surrounding air temperature
information, and display the outside temperature in the
instrument cluster.

5. Ambient and Sun Light Sensor

Ambient and sun light sensor is located in the instrument panel
upper middle panel. ambient and sun light sensor is light
energy sensor that measure sunlight generated heat, providing
additional compensation parameters to air-conditioning control
module. Air-conditioning control module in real time
automatically adjusts the air-conditioning air volume and cold /
hot air mixture ratio, according to light intensity, the vehicle
status and the vehicle air-conditioning demand conditions, so
that all occupants feel comfortable.

6. Inside Air-conditioning Assembly

Inside air-conditioning assembly is located in instrument panel,
and consists the blower motor, blower motor control module,
air-conditioning filter, heater core, evaporator, expansion
valve, warm and cold air direction control motor and various air
deflection damper, ventilation duct.

A. Blower Motor

Note

Do not place the blower motor on the blower motor fan
wheel.

Do not touch the fan wheel blades to prevent damage.

Blower consists of the following components:

–

Permanent Magnet Motor

–

Mouse-cage Fan

Blowers operate at different speeds depending on the changes
in speed by the blower motor speed control device controlled
by the blower motor control module. If the user selects the
maximum air-conditioning mode, the vast majority of air into
blower is from the passenger compartment (inside circulation).

Under most operating conditions, outside air entering the
vehicle in the following ways:

–

Blower motor draws outside air.

–

Vehicle forward movement draws the outside air.

Blower motor blows air along the following lines:

–

Through the evaporator core

–

Through heater core

–

Into the passenger compartment

B. Heater Core

Heater core is the main heating system component. Heater
Core is located inside the air-conditioning. Whenever the
engine runs, the engine coolant from the engine is pumped into
the heater core. Heater core will transfer the engine coolant
heat to the air flowing through the heater core body. Heater
core has specific inlet and outlet air pipes. To remove the
heater core body, the heater core warm pipe must be
completely discharged. For service, the heater core warm pipe
must already be installed. Heater core is equipped with a
temperature sensor. The sensor send the heater core surface
temperature signal to the air-conditioning control module,
providing more compensation parameters.

C. Evaporator and Expansion Valve

Evaporator is located in the left hand side of the air-conditioning
assembly. To remove and install the evaporator and expansion
valve, the air-conditioning assembly must be removed first.
When removing, the evaporator refrigerant piping must be
completely discharged. When servicing, evaporator with
separate refrigerant pipelines must already be installed.
Expansion valve is connected to the evaporator, installed in
one end of the evaporator, located in the evaporator inlet.
Expansion valve one end is connected to the air-conditioning
compressor inlet and outlet pipes, the other is connected to the
evaporator inlet and outlet pipes. Within the pipeline, the high
pressure refrigerant is regulated to low pressure refrigerant and
flows to the evaporator.

Expansion valve changes the location according the air-
conditioning lower pressure limit and the upper pressure limit.

Evaporator cools the air and removes the moisture from the air
before the air enters into passenger compartment. Following
procedures happen in the evaporator:

–

Low-voltage low-temperature liquid / vapor refrigerant
entering into the evaporator.

–

Refrigerant flows through the evaporator.

–

Refrigerant evaporation.

–

Evaporated refrigerant absorbs heat from the air flowing
through the evaporator.

–

Low-pressure low temperature refrigerant enters into the
evaporator, steam leaves the evaporator.

Heating, Ventilation and A/C System

Automatic Air-conditioning

8-7

When the air heat passes the evaporator core, the air moisture
will condense on the evaporator core external surface, forms
water and flows out.

Evaporator is equipped with a temperature sensors to prevent
it from freezing. The sensor measures the evaporator heat sink
surface temperature. If the temperature is below 2°C (36 ºF),
the compressor clutch will not continue to work. If the
temperature increases to 4°C ( 39 ºF) or above, the compressor
resume working. In the system equipped with automatic
temperature control, the sensor signal will first be transferred
to the air-conditioning module, and then transferred to the air
pressure switch through dedicated circuit. If the air pressure
meets the requirements, the corresponding air-conditioning
signal will be sent to ECM. ECM controls the compressor clutch
closing.

7. Refrigerant R-134a and Lubricant

Air-conditioning system refrigerant has the following roles

–

Absorb heat

–

Carry heat

–

Release heat

This vehicle uses R-134a refrigerant, which is a non-toxic,
flame retardant, transparent, colorless liquefied gas.

Before servicing the air-conditioning system. Refer to the
refrigerant piping and fittings disposal and the chemical stability
instructions

R-134a system uses special synthetic lubricant 100 PG
refrigerant oil, which absorbs water. Refrigerant needs to be
stored in airtight containers. R-134a air-conditioning systems
can only use 100 PG synthetic refrigerant oil for internal
circulation. Only apply fossil based 525 viscosity refrigerant oil
to installation thread and O-ring. Using other lubricants will
cause the compressor or components malfunction.

Follow the manual steps in the following repairs:

–

Refrigerant recovery and recycling

–

Adding oil

–

Drain cooling system

–

Refill cooling system

8. Air-conditioning High Pressure Pipe, Air-
conditioning Low Pressure Pipe, Air-
conditioning Pressure Switch

This vehicle uses high pressure pipe and low pressure pipe
(air-conditioning hard pipes and / or hose) to form a closed
system. Refrigerant and lubricating oil flow in this closed
system, to complete the refrigerant cycle. Air-conditioning hard
pipe consists of the aluminum pipe and the corresponding
joints, air-conditioning hose consists rubber hose and the
corresponding joints.

Air pressure switch is a three-state pressure switch,
transmitting the air pressure signal.

Pressure Switch Values:

Name

Pressure Value

Signal

Values

Metric
(MPa)

US English

(psi)

High Voltage
Switch

2.51-3.14

364.0-455.3

OFF

Medium
Voltage
Switch

1.52

220.4

ON

Low Voltage
Switch

0.196-0.201

28.4-29.1

OFF

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Automatic Air-conditioning

Heating, Ventilation and A/C System

8.2.3 System Working Principle
8.2.3.1 Air-conditioning Control Panel Features
Description

1. Control Panel Icons

Temperature Setting

Manual

Windscreen

Defroster

Mode

Outside Temperature

Rear Window

Defroster

Auto

Inside Circulation

A/C Switch

Air Volume

FE08-1001b

2. Temperature Settings

Temperature setting knob is used to set the inside temperature.
The temperature value is shown on the LCD as user
information. The temperature is set within the range of 16-32°C
(61-90 ºF) the temperature regulation step is 0.5°C ( 33 ºF).
When the temperature is set below 16°C (61 ºF) , LCD displays
LO, When the temperature is set higher than the 32°C
( 90 ºF) LCD displays HI.

Temperature setting will not change the air-conditioning
system operating mode. In automatic mode, when access to
LO / HI, the system will remain the largest amount of wind
blowing. Measure the warm and cold conditioning motor Hi and
Lo motor position angle and voltage as the following table:

Warm and Cold

Conditioning

Motor

Angle (°)

Voltage (V)

Low (Lo)

302.11

4.62

High (Hi)

84.70

1.07

3. Air Volume Settings

Air volume control knob is used to manually set the fan speed.
In automatic mode, blower speed will be automatically
controlled by the system. Air volume control knob operation will
make the system state change from automatic mode to manual
mode. AUTO disappears, MANU displays. Air-conditioning
system uses 4.4-13.1 V voltage linear regulator control the fan
1-7 speeds.

Air Volume

Fan Speed

Air Volume

Ratio (%)

Blower

Terminal

Voltage (V)

0

0

0

0

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Automatic Air-conditioning

8-9

Air Volume

Fan Speed

Air Volume

Ratio (%)

Blower

Terminal

Voltage (V)

1

1

15

4.4

2

2

30

5.1

3

3

40

6.7

4

4

50

8.2

5

5

60

9.9

6

6

75

11.7

7

7

100

13.1

In manual mode, users can operate air volume control knob to
set the right air volume, air volume change from 1 to 7 level. In
automatic mode, blower speed is part of the automatic control
logic. Blower speed is not limited to the level 7 in manual mode,
but the LCD only displays 7. The bar in the display shows the
nearest fan speed.

4. Manual Adjustment / Automatic Adjustment
of the Wind Patterns

Automatic air-conditioning controller provides two kinds of
manual and automatic modes for users to choose out of wind.
By adjusting the face / feet / windshield of the throttle to control
the wind patterns. Blowing head and legs blown difference is
that the temperature distribution of feet in order to provide a
more warm air, and to provide more cool air head to ensure the
driver is always in a comfortable driving environment. The
temperature range of the distribution will be subject to the
impact of vehicle space.

Automatic air-conditioning, heater and evaporator controller
uses temperature sensors to determine the temperature of gas
mixture.

In manual mode, users can choose 5 wind modes:

1. Blow Facial

2. Two-way (Blow surface and blow feet)

3. Blow Feet

4. Hybrid (Blow feet and defrost)

5. Defrost

LCD displays appropriate wind mode icons. When the air-
conditioning system uses two DC motor control ventilation
mode, the air-conditioning controller can affect the air flow

distribution. The wind pattern corresponding to the angle and
voltage of the following table:

Manual

Configuration

Throttle

Angle (°)

Wind Motor

Voltage (V)

Blow Facial

21.17

0.29

Two-way (Blow
surface and blow
feet)

112.94

1.57

Blow Feet

180.70

2.51

Hybrid (Blow feet and
defrost)

286.58

3.98

Defrost

341.64

4.75

In automatic mode, the wind model is the automatic control
logic, as part of the wind mode is automatically selected by the
controller. When the wind mode button to operate the system
from the automatic mode to manual mode. In order to achieve
the degree of comfort, head to reach a certain temperature, foot
temperature is higher than the head temperature 4-6°C
(39-43 ºF). Air-conditioning system may result in certain
restrictions in certain special cases, the level of comfort not be
achieved. Air-conditioning control module to choose a time
closest to the pattern displayed in the LCD.

5. Inside and Outside Circulation Control

User can select inside and outside circulation mode:

1. Outside circulation mode, the outside circulation throttle

open, inside circulation throttle close.

2. Inside circulation mode, the inside circulation throttle open,

outside circulation throttle close.

Inside and outside circulation control button is used for manual
adjustment. In automatic mode, the throttle is controlled by the
system automatically. When inside and outside circulation
control button is operated, the system will enter the manual
mode. According to inside temperature, automatic control logic
automatically controls the throttle work. Users can switch
modes between inside and outside circulations. when the
inside circulation continues 20min, the system will
automatically switch to the outside circulation 2min, and then
back to inside circulation. Manually switch to the outside
circulation, the system will not interfere with this operation.

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Automatic Air-conditioning

Heating, Ventilation and A/C System