Acura CSX. Instruction — page 74

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10-4

10-4

Cooling System

Radiator Cap Test

Radiator Test

A

B

A

1. Wait until the engine is cool, then carefully remove

the radiator cap (A). Wet the radiator cap seal with
engine coolant, then install it on a commercially
available pressure tester (B).

2. Apply a pressure of 93

123 kPa

(0.95

1.25 kgf/cm , 14

18 psi).

3. Check for a drop in pressure.

4. If the pressure drops, replace the cap.

1. Wait until the engine is cool, then carefully remove

the radiator cap and fill the radiator with engine
coolant to the base of the filler neck.

2. Attach a commercially available pressure tester (A)

to the radiator, and apply a pressure of 93

123 kPa

(0.95

1.25 kgf/cm , 14

18 psi).

3. Inspect for engine coolant leaks and a drop in

pressure.

4. Check for engine oil in the coolant and/or coolant in

the engine oil.

5. Remove the tester, and reinstall the radiator cap.

2

2

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Standard Thermostat
Lift Height:

Above 8.0 mm (0.31 in.)

Starts Opening: 76

80 °C (169

176 °F)

Fully Open:

90 °C (194 °F)

10-5

10-5

Fan Motor Test

Thermostat Test

B

A

1. Disconnect the 2P connectors from the radiator fan

motor and the A/C condenser fan motor.

2. Test the motor by connecting battery power to

terminal No. 2 and ground to terminal No. 1.

3. If the motor fails to run or does not run smoothly,

replace it (see page 10-19).

Replace the thermostat if it is stuck in the open position
at room temperature.

To test a closed thermostat:

1. Suspend the thermostat (A) in a container of water.

Do not let the thermostat and the thermometer (B)
touch the bottom of the hot container.

2. Heat the water, and check the temperature with a

thermometer. Check the temperature when the
thermostat first opens, then check the temperature
again when the thermostat is fully open.

3. Measure the lift height of the thermostat when it is

fully open. If it thermostat is not within the
specification, replace it.

Terminal side of
male terminals

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K20Z2 engine

10-6

10-6

Cooling System

Water Pump Inspection

Water Pump Replacement

A

A

B

A

6 x 1.0 mm
12 N·m (1.2 kgf·m, 8.7 lbf·ft)

1. Remove the drive belt (see page 4-31).

2. Turn the water pump pulley counterclockwise, and

check that it turns freely and smoothly. If it does not
turn smoothly, replace the water pump (see page
10-6).

NOTE: When you check the water pump, you may
see a small amount of ‘‘weeping’’ from the bleed
holes (A). This is normal.

3. Install the drive belt (see page 4-31).

1. Remove the drive belt (see page 4-31).

2. Drain the engine coolant (see page 10-8).

3. Remove the drive belt auto-tensioner pulley

(see page 4-33).

4. Remove the crankshaft pulley (see page 6-16).

5. Remove the six bolts securing the water pump,

then remove the water pump (A).

6. Inspect, and clean the O-ring groove and mating

surface of the water passage.

7. Install the water pump with a new O-ring (B).

8. Clean up any spilled engine coolant.

9. Install the crankshaft pulley (see page 6-17).

10. Install the drive belt auto-tensioner pulley

(see page 4-33).

11. Install the drive belt (see page 4-31).

12. Refill the radiator with engine coolant, and bleed

the air from the cooling system with the heater
valve open (see step 6 on page 10-8).

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K20Z3 engine

10-7

10-7

Coolant Check

A

B

C

6 x 1.0 mm
12 N·m
(1.2 kgf·m, 8.7 lbf·ft)

C

A

B

1. Remove the drive belt (see page 4-31).

2. Drain the engine coolant (see page 10-8).

3. Remove the drive belt auto-tensioner pulley

(see page 4-33).

4. Remove the crankshaft pulley (see page 6-16).

5. Remove the oil cooler joint pipe (A), then remove

the seven bolts securing the water pump. Remove
the water pump (B).

6. Inspect, and clean the O-ring groove and mating

surface of the water passage.

7. Install the water pump with new O-rings (C) and the

oil cooler joint pipe.

8. Clean up any spilled engine coolant.

9. Install the crankshaft pulley (see page 6-17).

10. Install the drive belt auto-tensioner pulley

(see page 4-33).

11. Install the drive belt (see page 4-31).

12. Refill the radiator with engine coolant, and bleed

the air from the cooling system with the heater
valve open (see step 6 on page 10-8).

1. Check the coolant level in the coolant reservoir.

Make sure it is between the MAX mark (A) and MIN
mark (B).

2. If the coolant level in the coolant reservoir is at or

below the MIN mark, add coolant to bring it up to
the MAX mark, then inspect the cooling system for
leaks.

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