Volkswagen Amarok 2011 Workshop Manual page 28

Amarok 2011 ➤ , Beetle 2012 ➤ , Bora 1999 ➤ , CC 2010 ➤ , CC 2012 ➤ , ...
Air conditioning system with refrigerant R134a - Edition 10.2014
2.1.7 Evaporator
The liquid refrigerant evaporates in the tubes of the evaporator.
The latent heat of evaporation is taken from the air streaming past
the evaporator fins. The air cools. The refrigerant evaporates and
is drawn into the air conditioning system compressor carrying with
it the heat it has absorbed.
A restrictor or an expansion valve allows a defined quantity of
refrigerant to flow to the evaporator. In systems with an expansion
valve, the flow is regulated such that only gaseous refrigerant ex‐
its the evaporator.
2.1.8 Reservoir
The reservoir collects the vaporised and gaseous mixture coming
from the evaporator to ensure the air conditioner compressor re‐
ceives only gaseous refrigerant. Gaseous refrigerant is formed
from the vapour.
Refrigerant oil flowing in the circuit does not remain in the reser‐
voir, as an oil extraction hole has been provided.
Moisture which has entered the refrigerant circuit during repairs
will be collected by a filter (dryer bag) in the reservoir.
Gaseous refrigerant with oil is drawn in by the air conditioner
compressor.
Note
Renew the reservoir if the refrigerant circuit has stood open
♦
for any length of time (more than the normal repair time) and
moisture has entered the system, or if it is required because
of a specific complaint
Do not remove sealing plugs -A- and -B- until just before in‐
♦
stallation.
The dryer bag in an unsealed reservoir will become saturated
♦
with moisture within a short time and is then unusable.
When installing, observe arrow indicating direction of flow, if
♦
applicable.
22
Rep. gr.00 - Technical data
⇒ page 159 .