Toyota Prius 2010 Repair Manual page 336

Symptom
high on both low
and high pressure
sides
No air bubbles are
seen through sight
glass even when
compressor is on
(7) Air is present in the refrigeration system.
Symptom
Pressure is too high on
both low and high
pressure sides
The low pressure piping
is too hot to touch
Bubbles can be seen
through sight glass
(8) Expansion valve malfunction
Symptom
2010 Toyota Prius
Probable Cause
sufficient
performance due to
excessive use of
refrigeration
system
Cooling
effectiveness of
condenser is
insufficient
Probable
Cause
Air present in
refrigeration system
Air in
Insufficient vacuum
system
purging
Probable Cause
Diagnosis
in cycle → excessive
refrigerant was added
during recharging
Condenser cooling
effectiveness is
insufficient →
condenser fins are
clogged at cooling fan
Diagnosis
Diagnosis
Corrective Action
2. Check the
operation of the
condenser cooling
fan
3. If 1 and 2 are
normal state, check
the amount of
refrigerant and
supply a proper
amount of
refrigerant
Corrective Action
1. Check compressor oil to see
if it is dirty or insufficient
2. Evacuate the system and
recharge it with new or
purified refrigerant
Corrective
Action
Repair Manual