Toyota Sequoia (2005). Manual - part 935

AC–2

–

AIR CONDITIONING

AIR CONDITIONING SYSTEM

3729

9.

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

The SEQUOIA is equipped with an SRS (Supplemental Re-
straint System) such as the driver, passenger, side, and curtain
shield airbags. Failure to carry out service operation in the cor-
rect sequence could cause the SRS to unexpectedly deploy
during servicing, possibly leading to a serious accident. Before
servicing (including removal or installation of parts, inspection
or replacement), be sure to read the precautionary notices in
the RS section.

I21357

Sight Glass

AC1JT–06

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AIR CONDITIONING

AIR CONDITIONING SYSTEM

AC–3

3730

ON–VEHICLE INSPECTION

1.

INSPECT REFRIGERANT VOLUME

Observe the sight glass on the liquid tube.
Test conditions:

Running engine at 1,500 rpm

Single A/C:
Front blower speed control dial at ”HI” position

Dual A/C:
Front and rear blower speed set at ”HI” position

A/C switch ON

Single A/C:
Front temperature control dial at ”MAX. COOL” position

Dual A/C:
Front temperature control dial at ”MAX. COOL” position
Rear temperature control set at 18.5

°

C (65

°

F)

Fully open the doors

Item

Symptom

Amount of refrigerant

Remedy

1

Bubbles are present in sight glass continu-

ously

Insufficient*

(1) Check for gas leakage with gas leak de-

tector and repair if necessary

(2) Add refrigerant until bubbles disappear

2

No bubbles are present in sight glass

None, sufficient or too much

Refer to items 3 and 4

3

No temperature difference between com-

pressor inlet and outlet

Empty or nearly empty

(1) Check for gas leakage with gas leak de-

tector and repair if necessary

(2) Add refrigerant until bubbles disappear

4

Temperature between compressor inlet and

outlet is noticeably different

Correct or too much

Refer to items 5 and 6

5

Immediately after air conditioning is turned

off, refrigerant in sight glass stays clear

Too much

(1) Discharge refrigerant

(2) Evacuate air and charge proper amount

of purified refrigerant

6

When air conditioning is turned off, refriger-

ant foams and then stays clear

Correct

–

*: Bubbles in the sight glass with ambient temperature higher than usual can be considered normal if cooling
is sufficient.

I21803

Single A/C:

Dual A/C:

AC–4

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AIR CONDITIONING

AIR CONDITIONING SYSTEM

3731

2.

INSPECT REFRIGERANT PRESSURE WITH MAN-
IFOLD GAUGE SET

This is a method for checking the A/C system by using a man-
ifold gauge set. Read the manifold gauge pressure when the
conditions below are met.
Test conditions:

Temperature at the air inlet with R/F switch set at RECIRC
is 30 to 35

°

C (86 to 95

°

F)

Engine running at 1500 rpm

Blower speed control switch at ”HI” position

Temperature control dial at ”MAX. COOL” position

Dual A/C:
Rear temperature control set at 18.5

°

C (65

°

F)

HINT:
Gauge indications may vary slightly due to ambient tempera-
ture conditions.

(1)

Normally functioning refrigeration system.
Gauge reading:

Single A/C:

Gauge

MPa

kgf·cm

2

Low pressure

0.15 to 0.25

1.5 to 2.5

High pressure

1.6 to 1.8

16 to 18

Dual A/C:

Gauge

MPa

kgf·cm

2

Low pressure

0.25 to 0.35

2.5 to 3.5

High pressure

1.9 to 2.1

19 to 21

I21804

Condition: Periodically cools and then fails to cool

Single A/C:

Dual A/C:

I22613

Condition: Insufficient cooling

Single A/C:

Dual A/C:

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AIR CONDITIONING

AIR CONDITIONING SYSTEM

AC–5

3732

(2)

Moisture present in refrigeration system.

Symptom seen in 

refrigeration system

Probable cause

Diagnosis

Remedy

During operation, pressure on low

pressure side cycles between vac-

uum and normal

Moisture in refrigeration system

freezes at expansion valve orifice

and temporarily stops cycle, but

normal state is restored after the

ice melts

 Drier in oversaturated state 

 Moisture in refrigeration system

freezes at expansion valve orifice

and blocks circulation of refriger-

ant

(1) Replace receiver

(2) Remove moisture in cycle by

repeatedly evacuating air

(3) Charge proper amount of new

refrigerant

(3)

Insufficient cooling

Symptom seen in 

refrigeration system

Probable cause

Diagnosis

Remedy

 Pressure low on both low and

high pressure sides

 Bubbles seen in sight glass con-

tinuously

 Insufficient cooling performance

Gas leakage in refrigeration sys-

tem

 Insufficient refrigerant in system

 Refrigerant leaking

(1) Check for gas leakage with gas

leak detector and repair if neces-

sary

(2) Charge proper amount of re-

frigerant

(3) If indicated pressure value is

near 0 when connected to gauge,

create the vacuum after inspecting

and repairing the location of the

leak