Toyota Prius 2010 Repair Manual page 335

Symptom
Pressure is low on both low and
high pressure sides
Frost exists on pipe from
condenser to unit
(5) Refrigerant does not circulate.
Symptom
Vacuum is indicated on
low pressure side and
very low pressure is
indicated on high
pressure side
Frost or condensation is
seen on piping on both
sides of receiver/drier or
expansion valve
(6) Refrigerant is overcharged or cooling effectiveness of condenser is insufficient.
Symptom
Pressure is too
2010 Toyota Prius
Probable Cause
Refrigerant flow is obstructed by dirt
inside the pipes of the condenser core
Probable Cause
Refrigerant flow is
obstructed by moisture or
dirt in refrigeration
system
Refrigerant flow is
disrupted by gas leaks
internally through the
expansion valve
Probable Cause
Unable to develop
Diagnosis
Receiver is
clogged
Diagnosis
Refrigerant
does not
circulate
Diagnosis
Excessive refrigerant
Corrective
Action
Replace
condenser
Corrective Action
1. Check expansion
valve
2. Replace expansion
valve
3. Replace condenser
4. Evacuate air and
supply a proper
amount of new
refrigerant
5. For internal gas leaks
at expansion valve,
replace expansion
valve
Corrective Action
1. Clean condenser
Repair Manual