Lexus ES300 (1997 year). Manual — part 56

AC0BW–01

AC–108

–

AIR CONDITIONING

AIR CONDITIONING CONTROL ASSEMBLY

1665

1997 LEXUS ES300 (RM511U)

INSTALLATION

Installation is in the reverse order of removal (See page

AC–103

).

AC0BX–02

P19584

No. 1 ECT Switch

No. 2 ECT Switch

–

AIR CONDITIONING

ENGINE COOLANT TEMPERATURE (ECT) SWITCH

AC–109

1666

1997 LEXUS ES300 (RM511U)

ENGINE COOLANT
TEMPERATURE (ECT) SWITCH

REMOVAL

1.

DRAIN ENGINE COOLANT FROM RADIATOR

HINT:
It is not necessary to drain out all the coolant.

2.

REMOVE ECT SWITCHES

AC0BY–01

P01924

P06722

AC–110

–

AIR CONDITIONING

ENGINE COOLANT TEMPERATURE (ECT) SWITCH

1667

1997 LEXUS ES300 (RM511U)

INSPECTION

1.

INSPECT No. 1 SWITCH CONTINUITY

(a)

Using an ohmmeter, check that no continuity exists be-
tween the terminals when the coolant temperature is
above 98

°

C (208

°

F).

If continuity exists, replace the switch.
(b)

Using an ohmmeter, check that continuity exists between
the terminals when the coolant temperature is below
88

°

C (190

°

F).

If no continuity exists, replace the switch.

2.

INSPECT No. 2 SWITCH CONTINUITY

(a)

Using an ohmmeter, check that no continuity exists be-
tween the terminal and switch body when the coolant
temperature is above 93

°

C (199

°

F).

If continuity exists, replace the switch.
(b)

Using an ohmmeter, check that continuity exists between
the terminals when the coolant temperature is below
83

°

C (181

°

F).

If no continuity exists, replace the switch.

AC0BZ–01

–

AIR CONDITIONING

ENGINE COOLANT TEMPERATURE (ECT) SWITCH

AC–111

1668

1997 LEXUS ES300 (RM511U)

INSTALLATION

Installation is in the reverse order of removal (See page

AC–109

).