Toyota Corolla Repair Manual: On–vehicle inspection
1. Inspect refrigerant pressure with manifold gauge set
- this is a method in witch the trouble is located by using
a manifold gauge set. Read the manifold gauge pressure
when the these conditions are established.
Test conditions:
- temperature at the air inlet with the switch set
at recirc is 30 – 35 °c (86 – 95 °f)
- engine running at 1500 rpm
- blower speed control switch at ”hi” position
- temperature control dial at ”cool” position
a/c switch on
- fully open doors

- Normally functioning refrigeration system.
Gauge reading:
low pressure side:
0.15 – 0.25 Mpa (1.5 – 2.5 Kgf/cm2)
high pressure side:
1.37 – 1.57 Mpa (14 – 16 kgf/cm2)
- Moisture present in refrigeration system.

Symptom |
Probable cause |
Diagnosis |
Remedy |
During operation, pressure on low
pressure side sometimes become
a vacuum and sometime normal |
Moisture in refrigerating system
freezes at expansion valve orifice
causing a temporary stop of cycle,
however, when it melts, normal
state is restored. |
- Drier in oversaturected state
- moisture in refrigerating system
freezes at expansion valve orifice
and blocks circulation of refrigerant
|
- Replace condenser
- remove moisture in cycle by
repeatedly evacuating air
- supply proper amount of new
refrigerant
|
- Insufficient cooling

Symptom |
Probable cause |
Diagnosis |
Corrective actions |
- Pressure low on both low and
high pressure sides
- insufficient cooling performance
|
Gas leakage in refrigeration system |
- Insufficient refrigerant
- refrigerant leaking
|
- Check for gas leakage and repair
if necessary
- supply proper amount of new
refrigerant
- if indicated pressure value is
close to a 0 when connected to
gauge, create the vacuum after inspecting
and repairing location of
leak
|
- Poor circulation of refrigerant

Symptom |
Probable cause |
Diagnosis |
Corrective actions |
- Pressure low on both low and
high pressure sides
- frost on pipe from condenser to
unit
|
Refrigerant flow obstructed by dirt
in receiver |
Receiver clogged |
Replace condenser |
- Refrigerant does not circulate

Symptom |
Probable cause |
Diagnosis |
Corrective actions |
- Vacuum indicated on low pressure
side, very low pressure indicated
on high pressure side
- frost or dew seen on piping before
and after receiver/ drier or expansion
valve
|
- Refrigerant flow obstructed by
moisture or dirt in refrigerating system
- refrigerant flow obstructed by
gas leaked from expansion valve
|
Refrigerant does not circulate |
- Check expansion valve
- clean out dirt in expansion
valve by air blowing
- replace condenser
- evaporate air and supply proper
amount of new refrigerant.
- For gas leakage from expansion
valve, replace expansion
valve
|
- Refrigerant overcharged or insufficient cooling of condenser

Symptom |
Probable cause |
Diagnosis |
Corrective actions |
- Pressure too high on both low
and high pressure sides
|
- Unable to develop sufficient performance
due to excessive use of
refrigerating system
- insufficient cooling of condenser
|
- Excessive refrigerant in
cycle"too much refrigerant supplied
- condenser cooling
insufficient"condenser fins
clogged at cooling fan
|
- Clean condenser
- check cooling fan with cooling
fan motor operation
- if (1) and (2) are in normal
state, check amount of refrigerant
and supply proper amount of refrigerant
|
- Air present in refrigeration system

Symptom |
Probable cause |
Diagnosis |
Corrective actions |
- Pressure too high on both low
and high pressure sides
- the low pressure piping too hot
to the touch
|
Air entered in refrigerating system |
- Air present in refrigerating system
- insufficient vacuum purging
|
- Check compressor oil to see if
it is see if it is dirty or insufficient
- evacuate air and supply new
refrigerant
|
- Expansion valve improperly

Symptom |
Probable cause |
Diagnosis |
Corrective actions |
- Pressure too high on both low
and high pressure sides
- frost or large amount of dew on
piping on low pressure side
|
Trouble in expansion valve |
- Excessive refrigerant in low
pressure piping
- expansion valve opened too
wide
|
Check expansion valve |
- Defective compression compressor

Symptom |
Probable cause |
Diagnosis |
Corrective actions |
- Pressure too high on low high
pressure sides
- pressure too low to on high pressure
side
|
Internal leak in compressor |
- Compression failure
- leakage from valve damaged or
broken sliding parts
|
Repair or replace compressor |
Gauge readings (reference)

1. Discharge refrigerant from refrigeration system
turn the a/c switch on.
operating the cooler compressor at the engine rpm of approx. 1000
For 5 to 6 min., Circulate the refrige ...
Other materials:
Cooling
Preparation
Recomended tools
Equipment
Coolant
...
Listing the registered portable players
Select “List Audio” using .
The list of registered portable players will be displayed.
● Connecting the registered portable player to the audio system
1 Select the name of the portable player to be connected using
.
2 Select “Select” using .
● Deleting the registered portabl ...
Hood
Adjustment
Hint:
since the centering bolt is used as a hood hinge and hood lock
set bolt, the hood and hood lock can not be adjusted with it on.
Substitute a bolt with washer for the centering bolt.
1. Inspect hood sub–assy
Check that the clearance is within the standard value.
2 ...
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