cooling ACURA CSX 2006 Service Owner's Manual



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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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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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10-14Cooling System
EGR Passage Removal and Installation (cont’d)
5. Remove the air cleaner brackets.
6. Remove the EGR passage.
7. Remove the exhaust gas recirculation (EGR) valve.
08/08/21 14:40:02 61SNR030_100_0014
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Removal - K20Z3 engine
10-1610-16 Cooling System
EGR Passage Removal and
Installation (cont’d)
Water Outlet Removal and
Installation
BA
6x1.0mm
12 N·m
(1.2 kgf·m, 8.7 lbf·ft)
A
B
A B
C
5. Install the harness holder bracket (A), then install the harness holder (B).
6. Install the air cleaner assembly (see page 11-345).
7. 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).
8. 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).
08/08/21 14:40:03 61SNR030_100_0016
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Removal - K20Z3 engine
10-1610-16 Cooling System
EGR Passage Removal and
Installation (cont’d)
Water Outlet Removal and
Installation
BA
6x1.0mm
12 N·m
(1.2 kgf·m, 8.7 lbf·ft)
A
B
A B
C
5. Install the harness holder bracket (A), then install the harness holder (B).
6. Install the air cleaner assembly (see page 11-345).
7. 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).
8. 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).
08/08/21 14:40:03 61SNR030_100_0016
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Installation - K20Z3 engine
10-18Cooling System
Water Outlet Removal and Installation (cont’d)
8x1.25mm
22 N·m
(2.2 kgf·m, 16 lbf·ft)
A
B
8x1.25mm
22 N·m
(2.2 kgf·m, 16 lbf·ft)
A B
8x1.25mm
22 N·m
(2.2 kgf·m,
16 lbf·ft)
8x1.25mm
22 N·m
(2.2 kgf·m, 16 lbf·ft)
A B
C
1. Install the EGR plate (A) with a new gasket (B).
2. Install the water outlet (A) with a new gasket (B). 3. Install the air cleaner brackets.
4. Connect the upper radiator hose (A), the heater
hose (B), and the water bypass hose (C).
08/08/21 14:40:05 61SNR030_100_0018
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10-1910-19
Radiator and Fan Replacement
B
A
6x1.0mm
12 N·m
(1.2 kgf·m, 8.7 lbf·ft)
AB
C
A
C
C C
5. Install the harness holder bracket (A), then install
the harness holder (B).
6. Install the air cleaner assembly (see page 11-345).
7. 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).
8. Clean up any spilled engine coolant. 1. Do the battery removal procedure (see page 22-69).
2. Drain the engine coolant (see page 10-8).
3. Remove the front grille cover (see page 20-163).
4. Disconnect the fan motor connectors (A) and the
hood switch connector (B), then remove the
harnessclamps(C).
(cont’d)
08/08/21 14:40:05 61SNR030_100_0019
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