2006 ACURA CSX cooling

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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
08/08/21 14:39:57 61SNR030_100_0004
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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).
08/08/21 14:39:57 61SNR030_100_0006
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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.
08/08/21 14:39:58 61SNR030_100_0007
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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.
08/08/21 14:39:58 61SNR030_100_0007
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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.
08/08/21 14:39:59 61SNR030_100_0008
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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.
08/08/21 14:39:59 61SNR030_100_0010
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10-12Cooling System
Water Passage Replacement (cont’d)
6x1.0mm
12 N·m
(1.2 kgf·m, 8.7 lbf·ft)
A B
C
A
10x1.25mm
44 N·m (4.5 kgf·m, 33 lbf·ft) B
A D
E C
B
F
8x1.25mm
22 N·m
(2.2 kgf·m, 16 lbf·ft)
11. Install the water pump: K20Z2 engine (see page 10-6)
 K20Z3 engine (see page 10-7)
12. Install the thermostat housing (A) with a new O-ring (B).
13. Clean and dry the water passage mating surfaces.
14. Apply liquid gasket, P/N 08717-0004, 08718-0001, 08718-0003, or 08718-0009, evenly to the engine
block mating surface of the water passage, and to
the inside edge of the threaded bolt holes. Install
the component within 5 minutes of applying the
liquid gasket.
NOTE: If you apply liquid gasket P/N 08718-0012, the component must be install within 4 minutes.
 If too much time has passed after applying the liquid gasket, remove the old liquid gasket and
residue, then reapply new liquid gasket. 15. Install the water passage (A) with a new O-ring (B).
NOTE: Wait at least 30 minutes before filling the engine with coolant.
 Do not run the engine for at least 3 hours after installing the water passage.
16. Connect the PCV hose (C).
17. Install the connecting pipe (A) with a new O-ring (B).
18. Connect the lower radiator hose (C) and the water bypass hose (D), and install the harness clamp (E).
19. Tighten the bolt (F) securing the connecting pipe.
Replace.
Apply liquid gasket
along the broken line. Replace.
Replace.
08/08/21 14:40:00 61SNR030_100_0012
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Removal - K20Z2 engine
10-1310-13
EGR Passage Removal and
Installation
A
B
A B
C
20. Install the intake manifold:
 K20Z2 engine (see page 9-4)
 K20Z3 engine (see page 9-9)
21. Install the A/C compressor (see step 28 on page 5-19).
22. Install the A/C condenser fan shroud assembly.
23. Install the alternator (see page 4-36).
24. 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).
25. Clean up any spilled engine coolant. 1. Drain the engine coolant (see page 10-8).
2. Remove the air cleaner assembly (see page 11-345).
3. Remove the harness holder (A) from the bracket,
then remove the harness holder bracket (B).
4. Disconnect the upper radiator hose (A), the heater hose (B), and the water bypass hose (C).
(cont’d)
08/08/21 14:40:01 61SNR030_100_0013
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