ACURA CSX 2006 Service Repair Manual

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10-2Cooling System
Component Location Index
THERMOSTAT
RADIATOR
ENGINE COOLANT TEMPERATURE
(ECT) SENSOR 2
WATER PUMP
A/C CONDENSER FAN ASSEMBLY RADIATOR FAN ASSEMBLY
WATER PASSAGE COOLANT SEPARATOR
EXHAUST GAS RECIRCULATION
(EGR) PASSAGE
Test, page 10-5
Replacement, page 10-10
Replacement,
page 10-19Inspection, page 10-6
Replacement, page 10-6
Replacement, page 10-19
Fan Motor Test, page 10-5 Replacement, page 10-19
Fan Motor Test, page 10-5
Replacement,
page 10-11 Replacement, page 10-13
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K20Z3 engine
10-3
THERMOSTAT
RADIATOR
ENGINE COOLANT TEMPERATURE
(ECT) SENSOR 2
WATER PUMP
A/C CONDENSER FAN ASSEMBLY RADIATOR FAN ASSEMBLY WATER OUTLET
COOLANT SEPARATOR
OIL COOLER
WATER PASSAGE
Test, page 10-5
Replacement, page 10-10
Replacement, page 10-19
Inspection, page 10-6
Replacement, page 10-6
Replacement, page 10-19
Fan Motor Test, page 10-5 Replacement, page 10-19
Fan Motor Test, page 10-5 Replacement, page 10-16
Replacement, page 10-11
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10-410-4 Cooling System
Radiator Cap Test
Radiator Test
A
B
A
1. Wait until the engine is cool, then carefully removethe 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)
10-510-5
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
10-610-6 Cooling System
Water Pump Inspection
Water Pump Replacement
A
A
B
A
6x1.0mm
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
10-710-7
Coolant Check
A B
C
6x1.0mm
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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K20Z3 engine
10-710-7
Coolant Check
A B
C
6x1.0mm
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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K20Z2 engine
Engine Coolant Capacities (Including the coolant
reservoir capacity of 0.4 L (0.11 US gal))
M/T model:
After Coolant Change: 4.3 L (1.14 US gal)
After Engine Overhaul: 6.6 L (1.74 US gal)
A/T model:
After Coolant Change: 4.2 L (1.11 US gal)
After Engine Overhaul: 6.5 L (1.72 US gal)
K20Z3 engine
Engine Coolant Capacities (Including the coolant
reservoir capacity of 0.4 L (0.11 US gal))
After Coolant Change: 4.5 L (1.19 US gal)
After Engine Overhaul: 6.8 L (1.80 US gal)
10-8
Cooling System
Coolant Replacement
A
A
1. Wait until the engine is cool, then carefully removethe radiator cap.
2. Start the engine. Set the heater temperature control dial to maximum heat, then turn the ignition switch
to LOCK (0). Make sure the engine and the radiator
are cool to the touch.
3. Loosen the drain plug (A), and drain the coolant.
4. After the coolant has drained, tighten the radiator drain plug securely.
5. Remove, drain, and reinstall the coolant reservoir.
6. Fill the coolant reservoir to the MAX mark (A) with Honda Long Life Antifreeze/Coolant Type 2 (P/N
CA66688). 7. Pour Honda Long Life Antifreeze/Coolant Type 2
into the radiator up to the base of the filler neck.
NOTE: Always use Honda Long Life Antifreeze/Coolant Type 2. Using a non-Acura coolant can result in
corrosion, causing the cooling system to
malfunction or fail.
 Honda Long Life Antifreeze/Coolant Type 2 is a mixture of 50 % antifreeze and 50 % water. Do
not add water.
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10-9
8. Loosely install the radiator cap.
9. Set the heater temperature control dial tomaximum heat.
10. Start the engine, and let it run until it warms up (the radiator fan comes on at least twice).
11. Turn off the engine. Check the level in the radiator, and add Honda Long Life Coolant/Antifreeze
Type 2, if needed.
12. Install the radiator cap securely, then start the engine again, and check for leaks.
13. Clean up any spilled engine coolant.
14. If the maintenance minder required engine coolant replacement, reset the maintenance minder
(see page 3-6), and this procedure is complete. If
the maintenance minder did not require engine
coolant replacement, go to step 15.
15. Turn the ignition switch to LOCK (0).
16. Connect the Honda Diagnostic System (HDS) to the data link connector (DLC) (see step 2 on page 11-3).
17. Turn the ignition switch to ON (II).
18. Make sure the HDS communicates with the vehicle and the engine control module (ECM)/powertrain
control module (PCM). If it does not communicate,
troubleshoot the DLC circuit (see page 11- 204).
19. Select GAUGES in the BODY ELECTRICAL menu with the HDS.
20. Select ADJUSTMENT in the GAUGES with the HDS.
21. Select SERVICE REMINDER in the ADJUSTMENT menu with the HDS.
22. Select RESET in the SERVICE REMINDER menu with the HDS.
23. Select MAINTENACE SUB ITEM 5 RESET menu with the HDS.
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10-10Cooling System
Thermostat Replacement
THERMOSTAT ASSEMBLY
HARNESS CLAMP LOWER RADIATOR HOSE 6x1.0mm
10 N·m (1.0 kgf·m, 7.2 lbf·ft)O-RING
1. Drain the engine coolant (see page 10-8).
2. Remove the splash shield (see step 25 on page 5-5).
3. Remove the lower radiator hose, then remove the thermostat.
4. Install the new thermostat assembly with a new O-ring, then install the lower radiator hose.
5. Install the splash shield (see step 40 on page 5-20).
6. 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).
7. Clean up any spilled engine coolant.
Replace.
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