Heating engine

Hi,

The first thing I need you to check are two fuses in the under hood fuse/relay box. See pic 1.

Next, with the engine cold, key off, turn the fan blade to see if there is resistance or anything that could indicate a problem with the fan.

If nothing seems wrong, check the cooling fan relays. There are three. Here are the directions. The remaining pics correlate with the directions.

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2000 Lexus Truck RX 300 AWD V6-3.0L (1MZ-FE)

Cooling Fan Relay(s)
Vehicle Engine, Cooling and Exhaust Cooling System Radiator Cooling Fan Radiator Cooling Fan Motor Relay Testing and Inspection Component Tests and General Diagnostics Cooling Fan Relay(s)
COOLING FAN RELAY(S)
INSPECTION
1. INSPECT NO.1 COOLING FAN RELAY

pic 2

a. Remove the No.1 cooling fan relay. (Marking: FAN NO.1)

pic 3

b. Inspect the No. 1 cooling fan relay continuity.
1. Using an ohmmeter, check that there is continuity between terminals 3 and 5.
If there is no continuity, replace the relay.
2. Check that there is no continuity between terminals 1 and 2.
If there is continuity, replace the relay.

pic 4

c. Inspect the No.1 cooling fan relay operation.
1. Apply battery voltage across terminals 3 and 5.
2. Using an ohmmeter, check that there is continuity between terminals 1 and 2.
If there is no continuity, replace the relay.
d. Install the No.1 cooling fan relay.
2. INSPECT NO.2 COOLING FAN RELAY

pic 5

a. Remove the No.2 cooling fan relay. (Marking: FAN NO.2)

pic 6

b. Inspect the No.2 cooling fan relay continuity.
1. Using an ohmmeter, check that there is continuity between terminals 3 and 5.
If there is no continuity, replace the relay.
2. Check that there is continuity between terminals 2 and 4.
If there is no continuity, replace the relay.
3. Check that there is no continuity between terminals 1 and 2.
If there is continuity, replace the relay.

pic 7

c. Inspect the No.2 cooling fan relay operation.
1. Apply battery voltage across terminals 3 and 5.
2. Using an ohmmeter, check that there is no continuity between terminals 2 and 4.
If there is continuity, replace the relay.
3. Check that there is continuity between terminals 1 and 2.
If there is no continuity, replace the relay.
d. Install the No.2 cooling fan relay.
3. INSPECT NO.3 COOLING FAN RELAY

pic 8

a. Remove the No.3 cooling fan relay. (Marking: FAN NO.3)

pic 9

b. Inspect the No.3 cooling fan relay continuity.
1. Using an ohmmeter, check that there is continuity between terminals 3 and 5.
If there is no continuity, replace the relay.
2. Check that there is no continuity between terminals 1 and 2.
If there is continuity, replace the relay.

pic 10

c. Inspect the No.3 cooling fan relay operation.
1. Apply battery voltage across terminals 3 and 5.
2. Using an ohmmeter, check that there is continuity between terminals 1 and 2.
If there is no continuity, replace the relay.
d. Install the No.3 cooling fan relay.

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Here are a few links you may find helpful when testing:

https://www.2carpros.com/articles/replace-electric-fan-motor

https://www.2carpros.com/articles/how-a-car-fuse-works

https://www.2carpros.com/articles/how-to-check-a-car-fuse

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

https://www.2carpros.com/articles/how-to-use-a-voltmeter

https://www.2carpros.com/articles/how-to-check-wiring

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If you find the fan motor is bad, here are the directions for replacement:

2000 Lexus Truck RX 300 AWD V6-3.0L (1MZ-FE)
Procedures
Vehicle Engine, Cooling and Exhaust Cooling System Radiator Cooling Fan Radiator Cooling Fan Motor Service and Repair Procedures
PROCEDURES

pic 11

pic 12

pic 13

pic 14

REMOVAL
1. REMOVE RADIATOR ASSEMBLY

pic 15

2. REMOVE ELECTRIC COOLING FAN FROM RADIATOR
Remove the 6 bolts and cooling fan.
Torque: 5.0 Nm (50 kgf-cm, 44 inch lbs.)

DISASSEMBLY

pic 16

1. REMOVE FAN
Remove the nut and fan.

pic 17

2. REMOVE FAN MOTOR
a. Disconnect the wire and connector holder from the fan shroud.
b. Remove the 3 screws and fan motor.

REASSEMBLY

pic 18

1. INSTALL FAN MOTOR
a. Install the fan motor with the 3 screws.
b. Install the wire and connector holder to the fan shroud.
2. INSTALL FAN
Install the fan with the nut.

INSTALLATION
Installation is in the reverse order of removal.

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I hope this helps. Let me know if you need anything.

Take care,
Joe