Volkswagen Amarok 2011 Workshop Manual page 160

Amarok 2011 ➤ , Beetle 2012 ➤ , Bora 1999 ➤ , CC 2010 ➤ , CC 2012 ➤ , ...
Air conditioning system with refrigerant R134a - Edition 10.2014
Note
If this complaint occurs after a longer period of operation or
♦
only occasionally (the low pressure falls below the specifica‐
tion and the evaporator ices up) it is sufficient only to renew
the dryer (fitted within the receiver). Check the quantity of re‐
frigerant oil. Then evacuate the refrigerant circuit for at least 3
hours.
In case of this complaint, it is not initially necessary to purge
♦
the refrigerant circuit with compressed air and nitrogen, since
as a rule only a small quantity of moisture will have accumu‐
lated in the system, which can be removed by a longer evac‐
uation period.
In this case, the evaporator may ice up although the correct
♦
quantity of refrigerant is present in the refrigerant circuit.
Possible deviation from specifica‐
tion
• High pressure normal, low pres‐
sure too low (see diagram), the
required cooling power is deliv‐
ered.
154
Rep. gr.00 - Technical data
Possible cause of fault
♦ Actuation of air conditioner compressor reg‐
ulating valve - N280- is defective.
♦ Expansion valve defective.
♦ The air conditioner compressor is defective. – Extract refrigerant.
Rectifying fault
– Check actuation of
air conditioner com‐
pressor regulating
valve - N280- .
– Extract refrigerant.
– Purge (clean) refrig‐
erant circuit
⇒ page 67 .
– Renew the expan‐
sion valve and re‐
ceiver.
– Recharge refriger‐
ant circuit.
– Repeat the check; if
the system does not
operate correctly
– Renew the air con‐
ditioner compres‐
sor.
– Purge (clean) refrig‐
erant circuit
⇒ page 67 .
– Renew the air con‐
ditioner compres‐
sor.
– Recharge refriger‐
ant circuit.
– Repeat check.