Opel Frontera UE. Manual - part 619

HEATING, VENTILATION AND AIR CONDITIONING (HVAC)

1A–33

874RY00022

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Electronic Thermostat (With Manual A/C)

The thermostat consists of the thermo sensor and
thermostat unit which functions electrically to reduce the
noises being generated while the system is in operation.
The electronic thermo sensor is mounted at the
evaporator core outlet and senses the surface
temperature of the evaporator core. Temperature
signals are input to the thermostat unit. This information
is compared by the thermo unit and results in the output
to operate the A/C thermostat relay and turn the
magnetic clutch ON or OFF to prevent evaporator
freeze-up.
A characteristic of the sensor is that the resistance
decreases as the temperature increases and the
resistance increases as the temperature decreases.

874RX008

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Legend

(1) Evaporator Core
(2) Insulator
(3) Expansion Valve

Legend

(1) Duct Sensor
(2) Evaporator Core
(3) Thermostat Unit

1A–34

HEATING, VENTILATION AND AIR CONDITIONING (HVAC)

Refrigerant Line

Restriction in the refrigerant line will be indicated by:

1. Suction line — A restricted suction line will cause

low suction pressure at the compressor, low
discharge pressure and little or no cooling.

2. Discharge line — A restriction in the discharge line

generally will cause the discharge line to leak.

3. Liquid line — A liquid line restriction will be

evidenced by low discharge and suction pressure
and insufficient cooling.

Refrigerant flexible hoses that have a low permeability
to refrigerant and moisture are used. These low
permeability hoses have a special nylon layer on the
inside.

852RS001

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Legend

(1) Reinforcement Layer (Polyester)
(2) External Rubber Layer
(3) Internal Rubber Layer
(4) Resin Layer (Nylon)