Volkswagen Amarok 2011 Workshop Manual page 143

Amarok 2011 ➤ , Beetle 2012 ➤ , Bora 1999 ➤ , CC 2010 ➤ , CC 2012 ➤ , ...
Possible deviation
from specification
• High pressure re‐ Too little refrigerant in cir‐
mains constant or cuit or expansion valve
increases only defective.
slightly (above the
pressure meas‐
ured when the en‐
gine is stopped),
• Low pressure falls
quickly to the dia‐
gram value or low‐
er,
• The required cool‐
ing output is not
delivered.
• High pressure is
normal,
• Low pressure
matches the dia‐
gram value,
• The required cool‐
ing output is not
delivered.
Air conditioning system with refrigerant R134a - Edition 10.2014
Possible cause of fault Rectifying
fault
– Extract
some re‐
frigerant
from the
refriger‐
ant cir‐
cuit.
• The
quantity
of refrig‐
erant ex‐
tracted is
about
equal to
the pre‐
scribed
charge
quantity.
– Renew
expan‐
sion
valve.
– Recharge
refriger‐
ant cir‐
cuit.
– Repeat
check.
• The
quantity
of refrig‐
erant ex‐
tracted is
signifi‐
cantly
less than
the pre‐
scribed
charge
quantity.
– Look for
leaks us‐
ing leak
detector
and recti‐
fy them.
– Recharge
refriger‐
ant cir‐
cuit.
– Repeat
check.
10. Checking pressures on vehicles
137