Lexus SC300 / Lexus SC400. Service manual — part 36

DRIVE BELT TENSION

INSPECTION OF DRIVE BELT TENSION

1.

INSPECT DRIVE BELT’S INSTALLATION CONDITION
Check that the drive belt fits properly in the ribbed grooves.

2.

INSPECT DRIVE BELT TENSION
Check that the tension is within the A range on the auto ten-
sioner scale.
If the tension is not within the A range on the scale, replace
the belt with a new one.
HINT: When replacing the drive belt with a new one, the belt’s
tension should be within the B range on the belt tensioner
scale.

IDLE–UP SPEED

INSPECTION OF IDLE SPEED

1.

WARM UP ENGINE

2.

INSPECT IDLE SPEED

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Trans–

mission

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Magnetic clutch

condition

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Standard idle

speed (rpm)

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A/T

(N range)

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No engaged

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650 rpm

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Engaged

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800 rpm

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M/T

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No engaged

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700 rpm

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Engaged

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900 rpm

AC–104

–

AIR CONDITIONING SYSTEM

Driver Belt Tension, Idle-Up Speed

REFRIGERANT LINES

TIGHTENING TORQUE OF
REFRIGERANT LINES

ON–VEHICLE INSPECTION

1.

INSPECT HOSES AND TUBES FOR LEAKAGE
Use a gas leak tester. Replace if necessary.

2. INSPECT HOSE AND TUBE CONNECTIONS FOR

LOOSENESS

–

AIR CONDITIONING SYSTEM

Refrigerant Lines

AC–105

REPLACEMENT OF REFRIGERANT
LINES

1.

RECOVER REFRIGERANT IN REFRIGERATION SYSTEM
See page

AC–16

2.

REPLACE FAULTY TUBE OR HOSE
NOTICE: To prevent the intrusion of moisture or dirt, caps
should be placed on hose or tube ends immediately.

3.

TORQUE CONNECTIONS TO SPECIFIED TORQUE
NOTICE: Connections should not be torque tighter than the
specified torque.

4. EVACUATE REFRIGERATION SYSTEM AND CHARGE

WITH REFRIGERANT
See page

AC–17

Specified amount: 950

±

50 g (33.44

±

1.76 oz)

5.

INSPECT FOR LEAKAGE OF REFRIGERANT
Using a gas leak tester, check for leakage of refrigerant.

6.

INSPECT A/C OPERATION

AC–106

–

AIR CONDITIONING SYSTEM

Refrigerant Lines

A/C UNIT

REMOVAL OF A/C UNIT

1.

RECOVER REFRIGERANT IN SYSTEM
See page

AC–16

2. REMOVE

ENGINE

See page EM–118

3. REMOVE

WATER

VALVE

See page

AC–127

4.

REMOVE BRAKE TUBES BRACKET MOUNTING BOLTS
FROM DUSH PANEL

5. REMOVE

EVAPORATOR

See page

AC–122

6.

REMOVE WATER HOSE FROM HEATER RADIATOR

7. REMOVE

INSULATOR

RETAINER

Remove the two bolts and the retainer.

8.

REMOVE INSTRUMENT PANEL REINFORCEMENT
See page

BO–109

9.

REMOVE FLOOR CARPET
See page

BO–118

10. REMOVE REAR AIR DUCTS

Remove the nut and the air duct.

11. REMOVE HEATER TO RESISTER NO. 3 DUCT

Remove the screw and the duct.

–

AIR CONDITIONING SYSTEM

A/C Unit

AC–107