Engine Cooling System: Component Locations Honda Civic IX

Cooling System Component Location Index (Except K24Z7)

M/T

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A/T

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Note. Do not use this troubleshooting procedure if the A/C compressor is inoperative. Refer to the symptom troubleshooting index. If A/C refrigerant pressure is abnormal, the radiator fans are controlled based only on engine coolant temperature. Before doing symptom troubleshooting, check for PGM-FI DTCs. See How to Troubleshoot the A/T System , How to Troubleshoot the Fuel and Emissions Systems (K24Z7) , How to Troubleshoot the Fuel and Emissions Systems (R18A9) or How to Troubleshoot the Fuel and Emissions Systems (R18Z1)

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1. Fuse check: 1. Check the following fuse. Fuse No. A2-11 (20 A) Location Under-hood fuse/relay box Is the fuse OK? YES: Go to step 2. NO: Replace the fuse, and recheck. If the fuse blows again, check for a short in the No. A2-11 (20 A) fuse circuit.
2. Radiator fan relay check: 1. Remove the radiator fan relay from the under-hood fuse/relay box, and test it See «POWER RELAY TEST (EXCEPT NATURAL GAS MODELS)»(ref-614103-S35184897672014050700000) or «POWER RELAY TEST (NATURAL GAS MODELS)»(ref-614103-S26004828472014050700000) . Is the relay OK? YES: Go to step 3. NO: Replace the radiator fan relay.
3. A/C signal output check: 1. Connect the HDS to the DLC. 2. Turn the ignition switch to ON (II). Make sure the A/C system is OFF, then start the engine. 3. Turn the fan control button ON, then momentarily turn ON the A/C with the A/C button. NOTE: Do not run the A/C for more then a few seconds with the engine running or damage to the A/C system will result. 4. Check the FAN LOW CTRL in the PGM-FI Data List with the HDS. Is the FAN LOW CTRL on with the A/C on? YES: Go to step 4. NO: Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM (K24Z7 engine) See «ECM REMOVAL AND INSTALLATION (K24Z7)»(ref-614093-S42243049962014050700000) , «ECM/PCM REMOVAL AND INSTALLATION (Except K24Z7 and R18Z1 (CVT)»(ref-614093-S04499420502014050700000) or ECM/PCM UPDATE or ECM/PCM (except K24Z7 engine) See «ECM REMOVAL AND INSTALLATION (K24Z7)»(ref-614093-S42243049962014050700000) , «ECM/PCM REMOVAL AND INSTALLATION (Except K24Z7 and R18Z1 (CVT)»(ref-614093-S04499420502014050700000) or ECM/PCM UPDATE and recheck.
4. Open wire check (+B_MAIN_FAN line): 1. Turn the ignition switch to LOCK (0). 2. Measure the voltage between test points 1 and 2. Test condition IG LOCK (0) Radiator fan relay: disconnected Test circuit +B_MAIN_FAN Test point 1 Radiator fan relay 4P socket No. 1 (YEL) (Built into the under-hood fuse/relay box) Test point 2 Body ground Is there battery voltage? YES: The +B_MAIN_FAN wire is OK. Go to step 5. NO: An open in the +B_MAIN_FAN wire. Replace the under-hood fuse/relay box.
5. Determine possible failure area (radiator fan relay switch side circuit, radiator fan relay coil side circuit): 1. Connect terminals A and B with a jumper wire. Terminals A Radiator fan relay 4P socket No. 1 (YEL) (Built into the under-hood fuse/relay box) Terminals B Radiator fan relay 4P socket No. 2 (BRN) (Built into the under-hood fuse/relay box) Do the A/C condenser and radiator fans run on low? YES: Go to step 6. NO: Go to step 8 .
6. Radiator fan relay coil side power circuit check: 1. Disconnect the jumper wire. 2. Turn the ignition switch to ON (II). 3. Measure the voltage between test points 1 and 2. Test condition IG ON (II) Radiator fan relay: disconnected Test circuit MAIN_FAN_DIODE- Test point 1 Radiator fan relay 4P socket No. 8 (WHT) (Built into the under-hood fuse/relay box) Test point 2 Body ground Is there battery voltage? YES: Go to step 7. NO: Go to step 14 .
7. Open wire check (RFC_RLY_COM line): 1. Turn the ignition switch to LOCK (0). 2. Reinstall the radiator fan relay. 3. Jump the SCS line with the HDS. NOTE: This step must be done to protect the ECM/PCM from damage. 4. Disconnect the following connector. ECM/PCM connector A (49P) 5. Connect terminals A and B with a jumper wire. Terminals A ECM/PCM connector A (49P) No. 15 (BLU) Terminals B Body ground 6. Turn the ignition switch to ON (II). Do the A/C condenser and radiator fans run on low? YES: Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM (K24Z7 engine) See «ECM REMOVAL AND INSTALLATION (K24Z7)»(ref-614093-S42243049962014050700000) , «ECM/PCM REMOVAL AND INSTALLATION (Except K24Z7 and R18Z1 (CVT)»(ref-614093-S04499420502014050700000) or ECM/PCM UPDATE or ECM/PCM (except K24Z7 engine) See «ECM REMOVAL AND INSTALLATION (K24Z7)»(ref-614093-S42243049962014050700000) , «ECM/PCM REMOVAL AND INSTALLATION (Except K24Z7 and R18Z1 (CVT)»(ref-614093-S04499420502014050700000) or ECM/PCM UPDATE and recheck. NO: Repair an open in the wire between the radiator fan relay and the ECM/PCM.
8. Open wire check (MAIN_FAN_MOTOR line): 1. Disconnect the jumper wire. 2. Reinstall the radiator fan relay. 3. Disconnect the following connector. Radiator fan motor 2P connector 4. Turn the ignition switch to ON (II). Make sure the A/C system is OFF, then start the engine. 5. Turn the fan control button ON, then momentarily turn ON the A/C with the A/C button. NOTE: Do not run the A/C for more then a few seconds with the engine running or damage to the A/C system will result. 6. Measure the voltage between test points 1 and 2. Test condition IG ON (II), A/C button and fan control button ON Radiator fan motor 2P connector: disconnected Test circuit MAIN_FAN_MOTOR Terminal 1 Radiator fan motor 2P connector No. 1 (BRN) Terminal 2 Body ground Is there battery voltage with the A/C on? YES: The MAIN_FAN_MOTOR wire is OK. Go to step 9. NO: Repair an open in the wire between the radiator fan relay and the radiator fan motor.
9. Radiator fan motor test: 1. Set the A/C button and fan control button OFF, then turn the ignition switch to LOCK (0). 2. «TEST THE RADIATOR FAN MOTOR»(ref-614150-S06156962432014050700000) . Is the radiator fan motor OK? YES: Go to step 10. NO: Replace the radiator fan motor See «RADIATOR FAN MOTOR REMOVAL AND INSTALLATION (EXCEPT K24Z7)»(ref-614150-S12604998582014050700000) or «RADIATOR FAN MOTOR REMOVAL AND INSTALLATION (K24Z7)»(ref-614150-S42831716312014050700000) .
10. Fan control relay check: 1. Remove the fan control relay from the under-hood fuse/relay box, and test it See «POWER RELAY TEST (EXCEPT NATURAL GAS MODELS)»(ref-614103-S35184897672014050700000) or «POWER RELAY TEST (NATURAL GAS MODELS)»(ref-614103-S26004828472014050700000) . Is the relay OK? YES: Go to step 11. NO: Replace the fan control relay.
11. Open wire check (FAN_HI/LO_RLY_COM line): 1. Reconnect the radiator fan motor 2P connector. 2. Turn the ignition switch to ON (II). Make sure the A/C system is OFF, then start the engine. 3. Turn the fan control button ON, then momentarily turn ON the A/C with the A/C button. NOTE: Do not run the A/C for more then a few seconds with the engine running or damage to the A/C system will result. 4. Measure the voltage between test points 1 and 2. Test condition IG ON (II), A/C button and fan control switch ON Fan control relay: disconnected Test circuit FAN_HI/LO_RLY_COM Test point 1 Fan control relay 5P socket No. 4 (RED) (Built into the under-hood fuse/relay box) Test point 2 Body ground Is there battery voltage with the A/C on? YES: The FAN_HI/LO_RLY_COM wire is OK. Go to step 12. NO: Repair an open in the wire between the radiator fan motor and the fan control relay.
12. Open wire check (SUB_FAN_MOTOR line): 1. Set the A/C button and fan control button to OFF, then turn the ignition switch to LOCK (0). 2. Disconnect the following connector. A/C condenser fan motor 2P connector 3. Check for continuity between test points 1 and 2. Test condition IG LOCK (0) A/C condenser fan motor 2P connector: disconnected Test circuit SUB_FAN_MOTOR Test point 1 Fan control relay 5P socket No. 6 (BLU) (Built into the under-hood fuse/relay box) Test point 2 A/C condenser fan motor 2P connector No. 1 (BLU) Is there continuity? YES: The SUB_FAN_MOTOR wire is OK. Go to step 13. NO: Check for an open in the wire between the fan control relay and the A/C condenser fan motor.
13. Open wire check (GND line): 1. Check for continuity between test points 1 and 2. Test condition IG LOCK (0) A/C condenser fan motor 2P connector: disconnected Test circuit GND Test point 1 A/C condenser fan motor 2P connector No. 2 (BLK) Test point 2 Body ground Is there continuity? YES: The GND wire is OK. Replace A/C condenser fan motor See «A/C CONDENSER FAN MOTOR REMOVAL AND INSTALLATION»(ref-614128-S41071791972014050700000) or «A/C CONDENSER FAN MOTOR REMOVAL AND INSTALLATION»(ref-614128-S41071791972014050700000) . NO: Repair an open in the wire between the A/C condenser fan motor and body ground. If the wire is OK, check for poor ground at G301.
14. A/C diode B check: 1. Turn the ignition switch to LOCK (0). 2. Remove A/C diode B from the under-hood fuse/relay box. 3. Using the diode setting ( ) on a DVOM, check for current flow in both directions between A/C diode B terminals No. 1 and No. 2. Is there current flow in only one direction? YES: Go to step 15. NO: Replace A/C diode B.
15. Open wire check (IG2_A/C line): 1. Turn the ignition switch to ON (II). 2. Measure the voltage between test points 1 and 2. Test condition IG ON (II) Radiator fan relay: disconnected A/C diode B: disconnected Test circuit IG2_A/C Test point 1 A/C diode B 2P socket No. 2 (BRN) Test point 2 Body ground Is there battery voltage? YES: The IG2_A/C wire is OK. Replace the under-hood fuse/relay box. NO: Repair an open in the wire between the No. B22 (7.5 A) fuse in the under-dash fuse/relay box and A/C diode B.

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Note. Do not use this troubleshooting procedure if the A/C compressor is inoperative. Refer to the symptom troubleshooting index. If A/C refrigerant pressure is abnormal, the radiator fans are controlled based only on engine coolant temperature. Before doing symptom troubleshooting, check for PGM-FI DTCs. See How to Troubleshoot the A/T System , How to Troubleshoot the Fuel and Emissions Systems (K24Z7) , How to Troubleshoot the Fuel and Emissions Systems (R18A9) or How to Troubleshoot the Fuel and Emissions Systems (R18Z1)

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1. Fuse check: 1. Check the following fuse. Fuse No. A2-11 (20 A) Location Under-hood fuse/relay box Is the fuse OK? YES: Go to step 2. NO: Replace the fuse, and recheck. If the fuse blows again, check for a short in the No. A2-11 (20 A) fuse circuit.
2. Radiator fan relay check: 1. Remove the radiator fan relay from the under-hood fuse/relay box, and test it See «POWER RELAY TEST (EXCEPT NATURAL GAS MODELS)»(ref-614103-S35184897672014050700000) or «POWER RELAY TEST (NATURAL GAS MODELS)»(ref-614103-S26004828472014050700000) . Is the relay OK? YES: Go to step 3. NO: Replace the radiator fan relay.
3. A/C signal output check: 1. Connect the HDS to the DLC. 2. Turn the ignition switch to ON (II). Make sure the A/C system is OFF, then start the engine. 3. Turn the fan control dial ON, then momentarily turn ON the A/C with the A/C button. NOTE: Do not run the A/C for more then a few seconds with the engine running or damage to the A/C system will result. 4. Check the FAN LOW CTRL in the PGM-FI Data List with the HDS. Is the FAN LOW CTRL on with the A/C on? YES: Go to step 4. NO: Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM (K24Z7 engine) See «ECM REMOVAL AND INSTALLATION (K24Z7)»(ref-614093-S42243049962014050700000) , «ECM/PCM REMOVAL AND INSTALLATION (Except K24Z7 and R18Z1 (CVT)»(ref-614093-S04499420502014050700000) or ECM/PCM UPDATE or ECM/PCM (except K24Z7 engine) See «ECM REMOVAL AND INSTALLATION (K24Z7)»(ref-614093-S42243049962014050700000) , «ECM/PCM REMOVAL AND INSTALLATION (Except K24Z7 and R18Z1 (CVT)»(ref-614093-S04499420502014050700000) or ECM/PCM UPDATE and recheck.
4. Open wire check (+B_MAIN_FAN line): 1. Turn the ignition switch to LOCK (0). 2. Measure the voltage between test points 1 and 2. Test condition IG LOCK (0) Radiator fan relay: disconnected Test circuit +B_MAIN_FAN Test point 1 Radiator fan relay 4P socket No. 1 (YEL) (Built into the under-hood fuse/relay box) Test point 2 Body ground Is there battery voltage? YES: The +B_MAIN_FAN wire is OK. Go to step 5. NO: An open in the +B_MAIN_FAN wire. Replace the under-hood fuse/relay box.
5. Determine possible failure area (radiator fan relay switch side circuit, radiator fan relay coil side circuit): 1. Connect terminals A and B with a jumper wire. Terminals A Radiator fan relay 4P socket No. 1 (YEL) (Built into the under-hood fuse/relay box) Terminals B Radiator fan relay 4P socket No. 2 (BRN) (Built into the under-hood fuse/relay box) Do the A/C condenser and radiator fans run on low? YES: Go to step 6. NO: Go to step 8 .
6. Radiator fan relay coil side power circuit check: 1. Disconnect the jumper wire. 2. Turn the ignition switch to ON (II). 3. Measure the voltage between test points 1 and 2. Test condition IG ON (II) Radiator fan relay: disconnected Test circuit MAIN_FAN_DIODE- Test point 1 Radiator fan relay 4P socket No. 8 (WHT) (Built into the under-hood fuse/relay box) Test point 2 Body ground Is there battery voltage? YES: Go to step 7. NO: Go to step 14 .
7. Open wire check (RFC_RLY_COM line): 1. Turn the ignition switch to LOCK (0). 2. Reinstall the radiator fan relay. 3. Jump the SCS line with the HDS. NOTE: This step must be done to protect the ECM/PCM from damage. 4. Disconnect the following connector. ECM/PCM connector A (49P) 5. Connect terminals A and B with a jumper wire. Terminals A ECM/PCM connector A (49P) No. 15 (BLU) Terminals B Body ground 6. Turn the ignition switch to ON (II). Do the A/C condenser and radiator fans run on low? YES: Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM (K24Z7 engine) See «ECM REMOVAL AND INSTALLATION (K24Z7)»(ref-614093-S42243049962014050700000) , «ECM/PCM REMOVAL AND INSTALLATION (Except K24Z7 and R18Z1 (CVT)»(ref-614093-S04499420502014050700000) or ECM/PCM UPDATE or ECM/PCM (except K24Z7 engine) See «ECM REMOVAL AND INSTALLATION (K24Z7)»(ref-614093-S42243049962014050700000) , «ECM/PCM REMOVAL AND INSTALLATION (Except K24Z7 and R18Z1 (CVT)»(ref-614093-S04499420502014050700000) or ECM/PCM UPDATE and recheck. NO: Repair an open in the wire between the radiator fan relay and the ECM/PCM.
8. Open wire check (MAIN_FAN_MOTOR line): 1. Disconnect the jumper wire. 2. Reinstall the radiator fan relay. 3. Disconnect the following connector. Radiator fan motor 2P connector 4. Turn the ignition switch to ON (II). Make sure the A/C system is OFF, then start the engine. 5. Turn the fan control dial ON, then momentarily turn ON the A/C with the A/C button. NOTE: Do not run the A/C for more then a few seconds with the engine running or damage to the A/C system will result. 6. Measure the voltage between test points 1 and 2. Test condition IG ON (II), A/C button and fan control dial ON Radiator fan motor 2P connector: disconnected Test circuit MAIN_FAN_MOTOR Terminal 1 Radiator fan motor 2P connector No. 1 (BRN) Terminal 2 Body ground Is there battery voltage with the A/C on? YES: The MAIN_FAN_MOTOR wire is OK. Go to step 9. NO: Repair an open in the wire between the radiator fan relay and the radiator fan motor.
9. Radiator fan motor test: 1. Set the A/C button and fan control dial to OFF, then turn the ignition switch to LOCK (0). 2. «TEST THE RADIATOR FAN MOTOR»(ref-614150-S06156962432014050700000) . Is the radiator fan motor OK? YES: Go to step 10. NO: Replace the radiator fan motor See «RADIATOR FAN MOTOR REMOVAL AND INSTALLATION (EXCEPT K24Z7)»(ref-614150-S12604998582014050700000) or «RADIATOR FAN MOTOR REMOVAL AND INSTALLATION (K24Z7)»(ref-614150-S42831716312014050700000) .
10. Fan control relay check: 1. Remove the fan control relay from the under-hood fuse/relay box, and test it See «POWER RELAY TEST (EXCEPT NATURAL GAS MODELS)»(ref-614103-S35184897672014050700000) or «POWER RELAY TEST (NATURAL GAS MODELS)»(ref-614103-S26004828472014050700000) . Is the relay OK? YES: Go to step 11. NO: Replace the fan control relay.
11. Open wire check (FAN_HI/LO_RLY_COM line): 1. Reconnect the radiator fan motor 2P connector. 2. Turn the ignition switch to ON (II). Make sure the A/C system is OFF, then start the engine. 3. Turn the fan control dial ON, then momentarily turn ON the A/C with the A/C button. NOTE: Do not run the A/C for more then a few seconds with the engine running or damage to the A/C system will result. 4. Measure the voltage between test points 1 and 2. Test condition IG ON (II), A/C button and fan control dial ON Fan control relay: disconnected Test circuit FAN_HI/LO_RLY_COM Test point 1 Fan control relay 5P socket No. 4 (RED) (Built into the under-hood fuse/relay box) Test point 2 Body ground Is there battery voltage with the A/C on? YES: The FAN_HI/LO_RLY_COM wire is OK. Go to step 12. NO: Repair an open in the wire between the radiator fan motor and the fan control relay.
12. Open wire check (SUB_FAN_MOTOR line): 1. Set the A/C button and fan control dial to OFF, then turn the ignition switch to LOCK (0). 2. Disconnect the following connector. A/C condenser fan motor 2P connector 3. Check for continuity between test points 1 and 2. Test condition IG LOCK (0) A/C condenser fan motor 2P connector: disconnected Test circuit SUB_FAN_MOTOR Test point 1 Fan control relay 5P socket No. 6 (BLU) (Built into the under-hood fuse/relay box) Test point 2 A/C condenser fan motor 2P connector No. 1 (BLU) Is there continuity? YES: The SUB_FAN_MOTOR wire is OK. Go to step 13. NO: Check for an open in the wire between the fan control relay and the A/C condenser fan motor.
13. Open wire check (GND line): 1. Check for continuity between test points 1 and 2. Test condition IG LOCK (0) A/C condenser fan motor 2P connector: disconnected Test circuit GND Test point 1 A/C condenser fan motor 2P connector No. 2 (BLK) Test point 2 Body ground Is there continuity? YES: The GND wire is OK. Replace A/C condenser fan motor See «A/C CONDENSER FAN MOTOR REMOVAL AND INSTALLATION»(ref-614128-S41071791972014050700000) or «A/C CONDENSER FAN MOTOR REMOVAL AND INSTALLATION»(ref-614128-S41071791972014050700000) . NO: Repair an open in the wire between the A/C condenser fan motor and body ground. If the wire is OK, check for poor ground at G301.
14. A/C diode B check: 1. Turn the ignition switch to LOCK (0). 2. Remove A/C diode B from the under-hood fuse/relay box. 3. Using the diode setting ( ) on a DVOM, check for current flow in both directions between A/C diode B terminals No. 1 and No. 2. Is there current flow in only one direction? YES: Go to step 15. NO: Replace A/C diode B.
15. Open wire check (IG2_A/C line): 1. Turn the ignition switch to ON (II). 2. Measure the voltage between test points 1 and 2. Test condition IG ON (II) Radiator fan relay: disconnected A/C diode B: disconnected Test circuit IG2_A/C Test point 1 A/C diode B 2P socket No. 2 (BRN) Test point 2 Body ground Is there battery voltage? YES: The IG2_A/C wire is OK. Replace the under-hood fuse/relay box. NO: Repair an open in the wire between the No. B22 (7.5 A) fuse in the under-dash fuse/relay box and A/C diode B.

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1. Fan Motor - Test Disconnect the connectors from the radiator fan motor (A) and the A/C condenser fan motor (B). Test each motor by connecting battery power to terminal No. 1 and ground to terminal No. 2. If a motor fails to run or does not run smoothly, replace it.

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1. Radiator Cap - Test 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). Apply a pressure of 93-123 kPa (0.95-1.25 kgf/cm 2 , 13.5 -17.8 psi). Check for a drop in pressure. If the pressure drops, replace the radiator cap.

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1. Radiator Cap Wait until the engine is cool, then carefully remove the radiator cap.
2. Vehicle Lift Raise the vehicle on a lift, and make sure it is securely supported.
3. Radiator Coolant - Replacement Loosen the drain plug (A), and drain the coolant.
4. Air Cleaner Assembly Disconnect the intake air duct (A) and the intake air pipe (B). Remove the harness clamp (C). Remove the air cleaner (D).
5. Engine Cover Remove the engine cover.
6. Intake Air Duct Remove the intake air duct.
7. Throttle Body - Removal Disconnect the EVAP canister hose (A) and the brake booster vacuum hose (B). Disconnect the connector (A). Remove the harness clamps (B). Remove the throttle body without disconnecting the hoses.
8. Intake Manifold Assembly Remove the intake manifold bracket. Remove the intake manifold (A). Disconnect the PCV hose (A).
9. Radiator Connecting Pipe Disconnect the heater hose (A) and the water bypass hose (B). Remove the harness clamp (C) and the connecting pipe mounting bolt (D). Remove the harness clamps (A) and the connecting pipe (B).

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1. Radiator Connecting Pipe Install the connecting pipe (A) with a new O-ring (B). Install the harness clamps (C). Install the connecting pipe mounting bolt (A) and the harness clamp (B). Connect the heater hose (C) and the water bypass hose (D).
2. Intake Manifold Assembly Connect the PCV hose (A). Install the intake manifold (A) with new gaskets (B). Install the intake manifold bracket.
3. Throttle Body - Installation Install the throttle body (A) with new gasket (B). Install the harness clamps (A). Connect the connector (B). Connect the EVAP canister hose (A) and the brake booster vacuum hose (B).
4. Intake Air Duct Install the intake air duct.
5. Engine Cover Install the engine cover.
6. Air Cleaner Assembly Install the air cleaner (A). Install the harness clamp (B). Connect the intake air pipe (C) and the intake air duct (D).
7. Tubes, Hoses, and Connectors After Installation Check After installation, check that all tubes, hoses, and connectors are installed correctly.
8. Radiator Coolant - Replacement Follow the chart and pour coolant into the radiator up to the base of the filler neck. NOTE: Use Honda Long Life Antifreeze/Coolant Type 2, and if necessary add Honda Extreme Cold Weather Antifreeze/Coolant Type 2 (concentrate). Using a non-Honda 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. Honda Extreme Cold Weather Antifreeze/Coolant Type 2 is a 100 % concentration coolant. Do not add water to either coolant. If the vehicle is regularly driven in very low temperatures (below -22 °F (-30 °C), a 60 % concentration of coolant should be used. Operation Vehicle Usage (Desired Mixture) Current Mixture Coolant Drain Add Amount of Honda Extreme Cold Weather Antifreeze/Coolant Type 2 (100 % concentrate) Then add Honda Long Life Antifreeze/Coolant Type 2 (50/50) Coolant Change Normal Area (50/50) 50/50 60/40 unknown Drain radiator, engine block, and reservoir None Top off the cooling system Very Cold Area (60/40) 50/50 unknown Drain radiator, engine block, and reservoir About 1.3 L (44 fl oz) 60/40 About 1.2 L (41 fl oz) Engine Overhaul Normal Area (50/50) - - None Very Cold Area (60/40) - - About 1.2 L (41 fl oz) Coolant Winterizing Very Cold Area (60/40) 50/50 Drain about 2.0 L (68 fl oz) from radiator About 1.2 L (41 fl oz) unknown (1) Drain radiator, engine block, and reservoir (1) When you want to winterize the coolant with the minimum amount of coolant change but the current coolant concentration in the vehicle is unknown, you must drain all coolant from the cooling system. Engine Coolant Capacities (Including the coolant reservoir capacity of 0.475 L (0.1255 US gal) Except K24Z7 engine Manufacturer Capacity At Coolant Change DENSO 5.59 L (1.477 US gal) TRAD 5.50 L (1.453 US gal) After Engine Overhaul (M/T) DENSO 6.42 L (1.696 US gal) TRAD 6.33 L (1.672 US gal) After Engine Overhaul (A/T) DENSO 6.56 L (1.732 US gal) TRAD 6.47 L (1.709 US gal) After Engine Overhaul (CVT) DENSO 6.52 L (1.722 US gal) TRAD 6.43 L (1.699 US gal) Engine Coolant Capacities (Including the coolant reservoir capacity of 0.475 L (0.1255 US gal) K24Z7 engine Capacity At Coolant Change 5.5 L (1.45 US gal) After Engine Overhaul 6.7 L (1.78 US gal)
9. Maintenance Minder Reset After doing all procedures, select the individual maintenance item you wish to reset with the HDS (See the Maintenance Minder General Information).

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1. Radiator Cap Wait until the engine is cool, then carefully remove the radiator cap.
2. Vehicle Lift Raise the vehicle on a lift, and make sure it is securely supported.
3. Radiator Coolant - Replacement Loosen the drain plug (A), and drain the coolant.
4. Intake Air Pipe Remove the intake air pipe.
5. Thermostat Housing Peripheral Assembly (Natural Gas Model) Disconnect the connectors (A). Remove the harness clamps (B). Disconnect the connector (A). Remove the harness clamp (B). Remove the harness bracket (A). Disconnect the lower radiator hose (B), the water bypass hose (C), and the heater hose (D).
6. Thermostat Housing (Natural Gas Model) Remove the thermostat housing.
7. Radiator Connecting Pipe Remove the connecting pipe (A).

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1. Radiator Connecting Pipe Install the connecting pipe (A) with new O-ring (B).
2. Thermostat Housing (Natural Gas Model) Install the thermostat housing (A), using a new gasket (B) and new O-ring (C).
3. Thermostat Housing Peripheral Assembly (Natural Gas Model) Connect the lower radiator hose (A), the water bypass hose (B), and the heater hose (C). Install the harness bracket (D). Install the harness clamp (A). Connect the connector (B). Install the harness clamps (A). Connect the connectors (B).
4. Intake Air Pipe Install the intake air pipe.
5. Radiator Coolant - Replacement (Natural Gas Model) Follow the chart and pour coolant into the radiator up to the base of the filler neck. NOTE: Use Honda Long Life Antifreeze/Coolant Type 2, and if necessary add Honda Extreme Cold Weather Antifreeze/Coolant Type 2 (concentrate). Using a non-Honda 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. Honda Extreme Cold Weather Antifreeze/Coolant Type 2 is a 100% concentration coolant. Do not add water to either coolant. If the vehicle is regularly driven in very low temperatures (below -22 °F (-30 °C), a 60 % concentration of coolant should be used. Operation Vehicle Usage (Desired Mixture) Current Mixture Coolant Drain Add Amount of Honda Extreme Cold Weather Antifreeze/Coolant Type 2 (100% concentrate) Then add Honda Long Life Antifreeze/Coolant Type 2 (50/50) Coolant Change Normal Area (50/50) 50/50 60/40 unknown Drain radiator, engine block, and reservoir None Top off the cooling system Very Cold Area (60/40) 50/50 unknown Drain radiator, engine block, and reservoir About 1.3 L (44 fl oz) 60/40 About 1.1 L (37 fl oz) Engine Overhaul Normal Area (50/50) - - None Very Cold Area (60/40) - - About 1.1 L (37 fl oz) Coolant Winterizing Very Cold Area (60/40) 50/50 Drain about 2.0 L (68 fl oz) from radiator About 1.1 L (37 fl oz) unknown (1) Drain radiator, engine block, and reservoir (1) When you want to winterize the coolant with the minimum amount of coolant change but the current coolant concentration in the vehicle is unknown, you must drain all coolant from the cooling system. Engine Coolant Capacities (Including the coolant reservoir capacity of 0.475 L (0.1255 US gal) At Coolant Change 5.50 L (1.453 US gal) After Engine Overhaul 6.51 L (1.720 US gal)
6. Maintenance Minder Reset After doing all procedures, select the individual maintenance item you wish to reset with the HDS (See the Maintenance Minder General Information).

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1. Radiator Cap Wait until the engine is cool, then carefully remove the radiator cap.
2. Vehicle Lift Raise the vehicle on a lift, and make sure it is securely supported.
3. Radiator Coolant - Replacement Loosen the drain plug (A), and drain the coolant.
4. Intake Air Pipe Remove the intake air pipe.
5. EGR Pipe Remove the EGR pipe (A).
6. Thermostat Housing Peripheral Assembly Disconnect the connectors (A). Remove the harness clamps (B). Except CVT CVT Disconnect the connector (A). Remove the harness clamp (B). Remove the harness bracket (A). Disconnect the lower radiator hose (B), the water bypass hose (C), and the heater hose (D). Except M/T M/T
7. Thermostat Housing Remove the thermostat housing.
8. Radiator Connecting Pipe Remove the connecting pipe (A).

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1. Radiator Connecting Pipe Install the connecting pipe (A) with new O-ring (B).
2. Thermostat Housing Install the thermostat housing (A), using a new gasket (B) and new O-ring (C).
3. Thermostat Housing Peripheral Assembly Connect the lower radiator hose (A), the water bypass hose (B), and the heater hose (C). Install the harness bracket (D). Except M/T M/T Install the harness clamp (A). Connect the connector (B). Install the harness clamps (A). Connect the connectors (B). Except CVT CVT
4. EGR Pipe Install the EGR pipe (A) with new gaskets (B).
5. Intake Air Pipe Install the intake air pipe.
6. Radiator Coolant - Replacement Follow the chart and pour coolant into the radiator up to the base of the filler neck. NOTE: Use Honda Long Life Antifreeze/Coolant Type 2, and if necessary add Honda Extreme Cold Weather Antifreeze/Coolant Type 2 (concentrate). Using a non-Honda 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. Honda Extreme Cold Weather Antifreeze/Coolant Type 2 is a 100 % concentration coolant. Do not add water to either coolant. If the vehicle is regularly driven in very low temperatures (below -22 °F (-30 °C), a 60 % concentration of coolant should be used. Operation Vehicle Usage (Desired Mixture) Current Mixture Coolant Drain Add Amount of Honda Extreme Cold Weather Antifreeze/Coolant Type 2 (100 % concentrate) Then add Honda Long Life Antifreeze/Coolant Type 2 (50/50) Coolant Change Normal Area (50/50) 50/50 60/40 unknown Drain radiator, engine block, and reservoir None Top off the cooling system Very Cold Area (60/40) 50/50 unknown Drain radiator, engine block, and reservoir About 1.3 L (44 fl oz) 60/40 About 1.2 L (41 fl oz) Engine Overhaul Normal Area (50/50) - - None Very Cold Area (60/40) - - About 1.2 L (41 fl oz) Coolant Winterizing Very Cold Area (60/40) 50/50 Drain about 2.0 L (68 fl oz) from radiator About 1.2 L (41 fl oz) unknown (1) Drain radiator, engine block, and reservoir (1) When you want to winterize the coolant with the minimum amount of coolant change but the current coolant concentration in the vehicle is unknown, you must drain all coolant from the cooling system. Engine Coolant Capacities (Including the coolant reservoir capacity of 0.475 L (0.1255 US gal) Except K24Z7 engine Manufacturer Capacity At Coolant Change DENSO 5.59 L (1.477 US gal) TRAD 5.50 L (1.453 US gal) After Engine Overhaul (M/T) DENSO 6.42 L (1.696 US gal) TRAD 6.33 L (1.672 US gal) After Engine Overhaul (A/T) DENSO 6.56 L (1.732 US gal) TRAD 6.47 L (1.709 US gal) After Engine Overhaul (CVT) DENSO 6.52 L (1.722 US gal) TRAD 6.43 L (1.699 US gal) Engine Coolant Capacities (Including the coolant reservoir capacity of 0.475 L (0.1255 US gal) K24Z7 engine Capacity At Coolant Change 5.5 L (1.45 US gal) After Engine Overhaul 6.7 L (1.78 US gal)
7. Maintenance Minder Reset After doing all procedures, select the individual maintenance item you wish to reset with the HDS (See the Maintenance Minder General Information).

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1. Fuse check: 1. Check the following fuses. Fuse No. A2-11 (20 A) Location Under-hood fuse/relay box Fuse No. B22 (7.5 A) Location Under-dash fuse/relay box Are the fuses OK? YES: The fuses are OK. Reinstall the fuses, then go to step 2. NO: Replace the fuse(s), and recheck. If the fuse(s) blows again, repair the short to ground on the No. A2-11 (20 A) fuse and No. B22 (7.5 A) fuse circuit.
2. Relay check: 1. Remove the radiator fan relay and the fan control relay from the under-hood fuse/relay box, and test them See «POWER RELAY TEST (EXCEPT NATURAL GAS MODELS)»(ref-614103-S35184897672014050700000) or «POWER RELAY TEST (NATURAL GAS MODELS)»(ref-614103-S26004828472014050700000) . Are the relays OK? YES: The relays are OK. Go to step 3. NO: Replace the relay(s).
3. Determine possible failure area (under-hood fuse/relay box, fan control circuit): 1. Measure the voltage between test points 1 and 2. Test condition IG LOCK (0) Radiator fan relay: disconnected Fan control relay: disconnected Test circuit +B_MAIN_FAN Test point 1 Radiator fan relay 4P socket No. 1 (YEL) Test point 2 Body ground Is there battery voltage? YES: Go to step 4. NO: Replace the under-hood fuse/relay box.
4. Determine possible failure area (GND line, other lines): 1. Connect terminals A and B with a jumper wire. Terminal A Fan control relay 5P socket No. 3 (BLK) Terminal B Fan control relay 5P socket No. 4 (RED) 2. Connect terminals A and B with a jumper wire. Terminal A Radiator fan relay 4P socket No. 1 (YEL) Terminal B Radiator fan relay 4P socket No. 2 (BRN) Does the radiator fan run at high speed? YES: Go to step 9 . NO: Go to step 5.
5. Open wire check (GND line): 1. Disconnect the jumper wires. 2. Check for continuity between test points 1 and 2. Test condition IG LOCK (0) Radiator fan relay: disconnected Fan control relay: disconnected Test circuit GND Test point 1 Fan control relay 5P socket No. 3 (BLK) Test point 2 Body ground Is there continuity? YES: The GND wire is OK. Go to step 6. NO: Repair an open in the GND wire between the fan control relay 5P socket and the ground (G301).
6. Radiator fan motor operation check: 1. «TEST THE RADIATOR FAN MOTOR»(ref-614150-S06156962432014050700000) . Is the motor OK? YES: The radiator fan motor is OK. Go to step 7. NO: Replace the radiator fan motor; except K24Z7 engine See «RADIATOR FAN MOTOR REMOVAL AND INSTALLATION (EXCEPT K24Z7)»(ref-614150-S12604998582014050700000) or «RADIATOR FAN MOTOR REMOVAL AND INSTALLATION (K24Z7)»(ref-614150-S42831716312014050700000) , K24Z7 engine See «RADIATOR FAN MOTOR REMOVAL AND INSTALLATION (EXCEPT K24Z7)»(ref-614150-S12604998582014050700000) or «RADIATOR FAN MOTOR REMOVAL AND INSTALLATION (K24Z7)»(ref-614150-S42831716312014050700000) .
7. Open wire check (MAIN_FAN_MOTOR line): 1. Check for continuity between test points 1 and 2. Test condition IG LOCK (0) Radiator fan relay: disconnected Fan control relay: disconnected Test circuit MAIN_FAN_MOTOR Test point 1 Radiator fan relay 4P socket No. 2 (BRN) Test point 2 Radiator fan motor 2P connector No. 1 (BRN) Is there continuity? YES: The MAIN_FAN_MOTOR wire is OK. Go to step 8. NO: Repair an open in the MAIN_FAN_MOTOR wire between the radiator fan relay 4P socket and the radiator fan motor 2P connector.
8. Open wire check (FAN_HI/LO_RLY_COM line): 1. Check for continuity between test points 1 and 2. Test condition IG LOCK (0) Radiator fan relay: disconnected Fan control relay: disconnected Test circuit FAN_HI/LO_RLY_COM Test point 1 Fan control relay 5P socket No. 4 (RED) Test point 2 Radiator fan motor 2P connector No. 2 (RED) Is there continuity? YES: The FAN_HI/LO_RLY_COM wire is OK. Check for poor connections or loose terminals at the under-hood fuse/relay box, the radiator fan motor, and ground G301, then go to step 1 . NO: Repair an open in the FAN_HI/LO_RLY_COM wire between the fan control relay 5P socket and the radiator fan motor 2P connector.
9. Open wire check (MAIN_FAN_DIODE- line) 1: 1. Disconnect the jumper wires. 2. Turn the ignition switch to ON (II). 3. Measure the voltage between test points 1 and 2. Test condition IG ON (II) Radiator fan relay: disconnected Fan control relay: disconnected Test circuit MAIN_FAN_DIODE- Test point 1 Radiator fan relay 4P socket No. 8 (WHT) Test point 2 Body ground Is there battery voltage? YES: The MAIN_FAN_DIODE- wire is OK. Go to step 10. NO: Repair an open in the MAIN_FAN_DIODE- wire between the radiator fan relay 4P socket and the under-dash fuse/relay box.
10. Open wire check (RFC_RLY_CL- line): 1. Turn the ignition switch to LOCK (0). 2. Connect the HDS to the DLC; DLC Circuit Troubleshooting (Except K24Z7) except K24Z7 engine, DLC Circuit Troubleshooting (K24Z7) K24Z7 engine. 3. Turn the ignition switch to ON (II). 4. Make sure the HDS communicates with the vehicle and the ECM/PCM. If it does not communicate, troubleshoot the DLC circuit; except K24Z7 engine See DLC CIRCUIT TROUBLESHOOTING (EXCEPT K24Z7) , K24Z7 engine See DLC CIRCUIT TROUBLESHOOTING (K24Z7) . 5. Jump the SCS line with the HDS, then turn the ignition switch to LOCK (0). NOTE: This step must be done to protect the ECM/PCM from damage. 6. Disconnect the following connector. ECM/PCM connector A (49P) 7. Check for continuity between test points 1 and 2. Test condition IG LOCK (0) Radiator fan relay: disconnected Fan control relay: disconnected ECM/PCM connector A (49P): disconnected Test circuit RFC_RLY_CL- Test point 1 Radiator fan relay 4P socket No. 9 (BLU) Test point 2 ECM/PCM connector A (49P) No. 15 (BLU) Is there continuity? YES: The RFC_RLY_CL- wire is OK. Go to step 11. NO: Repair an open in the RFC_RLY_CL- wire between the radiator fan relay 4P socket and the ECM/PCM.
11. Open wire check (MAIN_FAN_DIODE- line) 2: 1. Turn the ignition switch to ON (II). 2. Measure the voltage between test points 1 and 2. Test condition IG ON (II) Radiator fan relay: disconnected Fan control relay: disconnected Test circuit MAIN_FAN_DIODE- Test point 1 Fan control relay 5P socket No. 7 (WHT) Test point 2 Body ground Is there battery voltage? YES: The MAIN_FAN_DIODE- wire is OK. Go to step 12. NO: Repair an open in the MAIN_FAN_DIODE- wire between the fan control relay 5P socket and the under-dash fuse/relay box.
12. Open wire check (FAN_HI_SIGNAL line): 1. Turn the ignition switch to LOCK (0). 2. Check for continuity between test points 1 and 2. Test condition IG LOCK (0) Radiator fan relay: disconnected Fan control relay: disconnected ECM/PCM connector A (49P): disconnected Test circuit FAN_HI_SIGNAL Test point 1 Fan control relay 5P socket No. 5 (GRY) Test point 2 ECM/PCM connector A (49P) No. 16 (GRY) Is there continuity? YES: The FAN_HI_SIGNAL wire is OK. Update the ECM/PCM if it does not have the latest software See «ECM REMOVAL AND INSTALLATION (K24Z7)»(ref-614093-S42243049962014050700000) , «ECM/PCM REMOVAL AND INSTALLATION (Except K24Z7 and R18Z1 (CVT)»(ref-614093-S04499420502014050700000) or ECM/PCM UPDATE , or substitute a known-good ECM/PCM; except K24Z7 engine See «ECM REMOVAL AND INSTALLATION (K24Z7)»(ref-614093-S42243049962014050700000) , «ECM/PCM REMOVAL AND INSTALLATION (Except K24Z7 and R18Z1 (CVT)»(ref-614093-S04499420502014050700000) or ECM/PCM UPDATE , K24Z7 engine See «ECM REMOVAL AND INSTALLATION (K24Z7)»(ref-614093-S42243049962014050700000) , «ECM/PCM REMOVAL AND INSTALLATION (Except K24Z7 and R18Z1 (CVT)»(ref-614093-S04499420502014050700000) or ECM/PCM UPDATE , then recheck. If the ECM/PCM was substituted, and the symptom/indication goes away, replace the original ECM/PCM; except K24Z7 engine See «ECM REMOVAL AND INSTALLATION (K24Z7)»(ref-614093-S42243049962014050700000) , «ECM/PCM REMOVAL AND INSTALLATION (Except K24Z7 and R18Z1 (CVT)»(ref-614093-S04499420502014050700000) or ECM/PCM UPDATE , K24Z7 engine See «ECM REMOVAL AND INSTALLATION (K24Z7)»(ref-614093-S42243049962014050700000) , «ECM/PCM REMOVAL AND INSTALLATION (Except K24Z7 and R18Z1 (CVT)»(ref-614093-S04499420502014050700000) or ECM/PCM UPDATE . NO: Repair an open in the FAN_HI_SIGNAL wire between the fan control relay 5P socket and the ECM/PCM.

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1. Battery Terminal - Disconnection Make sure the ignition switch is in LOCK (0), or the vehicle ignition in the OFF mode. Disconnect and isolate the negative cable with the battery sensor (A) from the battery. NOTE: Always disconnect the negative side first. To protect the battery sensor connector (B) from damage, do not hold it when removing the negative terminal. Do not disconnect the battery sensor from the negative terminal (C). Disconnect the positive cable (D) from the battery.
2. Battery Remove the battery setting plate (A) and the battery (B).
3. Battery Base Assembly Remove the harness clamp (A). Remove the battery base (B).
4. Front Grille Cover Remove the front grille cover (A). If necessary, remove the front bumper upper duct (A).
5. Coolant Reservoir Disconnect the coolant reservoir hose (A). Remove the coolant reservoir (B).
6. Radiator Mounting Bracket, Upper Both Remove the radiator mount upper brackets/cushions (A), and the A/C condenser upper mount brackets (B).
7. Bulkhead - Removal Disconnect the connectors (A). Remove the harness clamps (B). Remove the bulkhead (A).
8. A/C Condenser Fan Shroud Assembly Remove the A/C condenser fan shroud assembly (A).
9. Radiator Fan Shroud Assembly Remove the radiator fan shroud assembly (A).
10. Radiator Fan Remove the radiator fan (A) from the radiator fan motor (B).
11. Radiator Fan Motor Remove the radiator fan motor (A) from the radiator fan shroud (B).

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1. Radiator Fan Motor Install the radiator fan motor (A) to the radiator fan shroud (B).
2. Radiator Fan Install the radiator fan (A) to the radiator fan motor (B).
3. Radiator Fan Shroud Assembly Install the radiator fan shroud assembly (A).
4. A/C Condenser Fan Shroud Assembly Install the A/C condenser fan shroud assembly (A).
5. Bulkhead - Installation Install the bulkhead (A). Install the harness clamps (A). Connect the connectors (B).
6. Radiator Mounting Bracket, Upper Both Install the radiator mount upper bracket/cushion (A), and the brackets (B).
7. Coolant Reservoir Install the coolant reservoir (A). Connect the coolant reservoir hose (B).
8. Front Grille Cover Install the front bumper upper duct (A). Install the front grille cover (A).
9. Battery Base Assembly Install the battery base (A). Install the harness clamp (B).
10. Battery Install the battery (A) and the battery setting plate (B). NOTE: Do not deform the battery setting plate by over-tightening the nuts.
11. Battery Terminal - Reconnection NOTE: If the battery performs abnormally, test the battery. Clean the battery terminals. Connect the positive cable (A) to the battery. NOTE: Always connect the positive side first. Connect the negative cable and the battery sensor (B) to the battery. NOTE: To protect the battery sensor connector (C) from damage, do not hold it when installing the negative terminal. Apply multipurpose grease to the terminals to prevent corrosion.

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1. Air Cleaner Assembly Disconnect the intake air duct (A) and the intake air pipe (B). Remove the harness clamp (C). Remove the air cleaner (D).
2. Battery Terminal - Disconnection Make sure the ignition switch is in LOCK (0), or the vehicle ignition in the OFF mode. Disconnect and isolate the negative cable with the battery sensor (A) from the battery. NOTE: Always disconnect the negative side first. To protect the battery sensor connector (B) from damage, do not hold it when removing the negative terminal. Do not disconnect the battery sensor from the negative terminal (C). Disconnect the positive cable (D) from the battery.
3. Battery Remove the battery setting plate (A) and the battery (B).
4. Battery Base Move the ECM without disconnecting the connectors. Remove the battery base.
5. Front Grille Cover Remove the front grille cover (A). If necessary, remove the front bumper upper duct (A).
6. Coolant Reservoir Disconnect the coolant reservoir hose (A). Remove the coolant reservoir (B).
7. Radiator Mounting Bracket, Upper Both Remove the radiator mount upper brackets/cushions (A), and the A/C condenser upper mount brackets (B).
8. Bulkhead - Removal Disconnect the connectors (A). Remove the harness clamps (B). Remove the bulkhead (A).
9. A/C Condenser Fan Shroud Assembly Remove the A/C condenser fan shroud assembly (A).
10. Radiator Fan Shroud Assembly Remove the radiator fan shroud assembly (A).
11. Radiator Fan Remove the radiator fan (A) from the radiator fan motor (B).
12. Radiator Fan Motor Remove the radiator fan motor (A) from the radiator fan shroud (B).

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1. Radiator Fan Motor Install the radiator fan motor (A) to the radiator fan shroud (B).
2. Radiator Fan Install the radiator fan (A) to the radiator fan motor (B).
3. Radiator Fan Shroud Assembly Install the radiator fan shroud assembly (A).
4. A/C Condenser Fan Shroud Assembly Install the A/C condenser fan shroud assembly (A).
5. Bulkhead - Installation Install the bulkhead (A). Install the harness clamps (A). Connect the connectors (B).
6. Radiator Mounting Bracket, Upper Both Install the radiator mount upper bracket/cushion (A), and the brackets (B).
7. Coolant Reservoir Install the coolant reservoir (A). Connect the coolant reservoir hose (B).
8. Front Grille Cover Install the front bumper upper duct (A). Install the front grille cover (A).
9. Battery Base Install the battery base. Install the ECM.
10. Battery Install the battery (A) and the battery setting plate (B). NOTE: Do not deform the battery setting plate by over-tightening the nuts.
11. Battery Terminal - Reconnection NOTE: If the battery performs abnormally, test the battery. Clean the battery terminals. Connect the positive cable (A) to the battery. NOTE: Always connect the positive side first. Connect the negative cable and the battery sensor (B) to the battery. NOTE: To protect the battery sensor connector (C) from damage, do not hold it when installing the negative terminal. Apply multipurpose grease to the terminals to prevent corrosion.
12. Air Cleaner Assembly Install the air cleaner (A). Install the harness clamp (B). Connect the intake air pipe (C) and the intake air duct (D).

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1. Radiator Cap Wait until the engine is cool, then carefully remove the radiator cap.
2. Vehicle Lift Raise the vehicle on a lift, and make sure it is securely supported.
3. Splash Shield Remove the splash shield (A).
4. Radiator Coolant - Replacement Loosen the drain plug (A), and drain the coolant.
5. Front Grille Cover Remove the front grille cover (A). If necessary, remove the front bumper upper duct (A).
6. Radiator Mounting Bracket, Upper Both Remove the radiator mount upper brackets/cushions (A), and the A/C condenser upper mount brackets (B).
7. Bulkhead - Removal Disconnect the connectors (A). Remove the harness clamps (B). Remove the bulkhead (A).
8. Radiator Assembly Disconnect the upper radiator hose (A). Disconnect the lower radiator hose (A). Remove the harness clamp (B). Pull up the radiator assembly.
9. Coolant Reservoir Remove the coolant reservoir.
10. A/C Condenser Fan Shroud Assembly Remove the A/C condenser fan shroud assembly.
11. Radiator Fan Shroud Assembly Remove the radiator fan shroud assembly.
12. ECT Sensor 2 - for Radiator After Removing Remove ECT sensor 2.

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1. ECT Sensor 2 - for Radiator After Removing Install ECT sensor 2.
2. Radiator Fan Shroud Assembly Install the radiator fan shroud assembly.
3. A/C Condenser Fan Shroud Assembly Install the A/C condenser fan shroud assembly.
4. Coolant Reservoir Install the coolant reservoir.
5. Radiator Assembly Install the radiator assembly. Check the quick connector (A) and the set ring (B) for cracks or damage. If the quick connector and/or the set ring are cracked or damaged, replace the quick connector. Make sure the set ring is in place inside the quick connector. If the set ring is off the quick connector, replace the quick connector. Replace a new O-ring (C) in the quick connector. Check the lock (D). If the lock is damaged or deformed, replace it. When installing the new lock on the quick connector, push it straight down along the groove. Clean the connecting surface of the thermostat cover (E), then apply clean engine coolant around the connecting surface. Install the harness clamp (A). Connect the lower radiator hose (B). Connect the upper radiator hose (A).
6. Bulkhead - Installation Install the bulkhead (A). Install the harness clamps (A). Connect the connectors (B).
7. Radiator Mounting Bracket, Upper Both Install the radiator mount upper bracket/cushion (A), and the brackets (B).
8. Front Grille Cover Install the front bumper upper duct (A). Install the front grille cover (A).
9. Splash Shield Install the splash shield (A).
10. Radiator Coolant - Replacement Follow the chart and pour coolant into the radiator up to the base of the filler neck. NOTE: Use Honda Long Life Antifreeze/Coolant Type 2, and if necessary add Honda Extreme Cold Weather Antifreeze/Coolant Type 2 (concentrate). Using a non-Honda 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. Honda Extreme Cold Weather Antifreeze/Coolant Type 2 is a 100 % concentration coolant. Do not add water to either coolant. If the vehicle is regularly driven in very low temperatures (below -22 °F (-30 °C), a 60 % concentration of coolant should be used. Operation Vehicle Usage (Desired Mixture) Current Mixture Coolant Drain Add Amount of Honda Extreme Cold Weather Antifreeze/Coolant Type 2 (100 % concentrate) Then add Honda Long Life Antifreeze/Coolant Type 2 (50/50) Coolant Change Normal Area (50/50) 50/50 60/40 unknown Drain radiator, engine block, and reservoir None Top off the cooling system Very Cold Area (60/40) 50/50 unknown Drain radiator, engine block, and reservoir About 1.3 L (44 fl oz) 60/40 About 1.2 L (41 fl oz) Engine Overhaul Normal Area (50/50) - - None Very Cold Area (60/40) - - About 1.2 L (41 fl oz) Coolant Winterizing Very Cold Area (60/40) 50/50 Drain about 2.0 L (68 fl oz) from radiator About 1.2 L (41 fl oz) Drain radiator, engine block, and reservoir unknown (1) (1) When you want to winterize the coolant with the minimum amount of coolant change but the current coolant concentration in the vehicle is unknown, you must drain all coolant from the cooling system. Engine Coolant Capacities (Including the coolant reservoir capacity of 0.475 L (0.1255 US gal) Except K24Z7 engine Manufacturer Capacity At Coolant Change DENSO 5.59 L (1.477 US gal) TRAD 5.50 L (1.453 US gal) After Engine Overhaul (M/T) DENSO 6.42 L (1.696 US gal) TRAD 6.33 L (1.672 US gal) After Engine Overhaul (A/T) DENSO 6.56 L (1.732 US gal) TRAD 6.47 L (1.709 US gal) After Engine Overhaul (CVT) DENSO 6.52 L (1.722 US gal) TRAD 6.43 L (1.699 US gal) Engine Coolant Capacities (Including the coolant reservoir capacity of 0.475 L (0.1255 US gal) K24Z7 engine Capacity At Coolant Change 5.5 L (1.45 US gal) After Engine Overhaul 6.7 L (1.78 US gal)
11. Maintenance Minder Reset After doing all procedures, select the individual maintenance item you wish to reset with the HDS (See the Maintenance Minder General Information).

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1. Radiator Cap Wait until the engine is cool, then carefully remove the radiator cap.
2. Vehicle Lift Raise the vehicle on a lift, and make sure it is securely supported.
3. Splash Shield Remove the splash shield (A).
4. Radiator Coolant - Replacement Loosen the drain plug (A), and drain the coolant.
5. Front Grille Cover Remove the front grille cover (A). If necessary, remove the front bumper upper duct (A).
6. Radiator Mounting Bracket, Upper Both Remove the radiator mount upper brackets/cushions (A), and the A/C condenser upper mount brackets (B).
7. Bulkhead - Removal Disconnect the connectors (A). Remove the harness clamps (B). Remove the bulkhead (A).
8. Radiator Assembly (Natural Gas Model) Disconnect the upper radiator hose. Disconnect the lower radiator hose (A). Disconnect the connector (B). Remove the harness clamp (C). Pull up the radiator assembly.
9. Coolant Reservoir Remove the coolant reservoir.
10. A/C Condenser Fan Shroud Assembly Remove the A/C condenser fan shroud assembly.
11. Radiator Fan Shroud Assembly Remove the radiator fan shroud assembly.
12. ECT Sensor 2 (for Radiator After Removing) Remove ECT sensor 2.

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1. ECT Sensor 2 (for Radiator After Removing) Install ECT sensor 2.
2. Radiator Fan Shroud Assembly Install the radiator fan shroud assembly.
3. A/C Condenser Fan Shroud Assembly Install the A/C condenser fan shroud assembly.
4. Coolant Reservoir Install the coolant reservoir.
5. Radiator Assembly (Natural Gas Model) Install the radiator. Connect the upper radiator hose. Install the clamp (A). Connect the connector (B). Connect the lower radiator hose (C).
6. Bulkhead - Installation Install the bulkhead (A). Install the harness clamps (A). Connect the connectors (B).
7. Radiator Mounting Bracket, Upper Both Install the radiator mount upper bracket/cushion (A), and the brackets (B).
8. Front Grille Cover Install the front bumper upper duct (A). Install the front grille cover (A).
9. Radiator Coolant - Replacement (Natural Gas Model) Follow the chart and pour coolant into the radiator up to the base of the filler neck. NOTE: Use Honda Long Life Antifreeze/Coolant Type 2, and if necessary add Honda Extreme Cold Weather Antifreeze/Coolant Type 2 (concentrate). Using a non-Honda 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. Honda Extreme Cold Weather Antifreeze/Coolant Type 2 is a 100% concentration coolant. Do not add water to either coolant. If the vehicle is regularly driven in very low temperatures (below -22 °F (-30 °C), a 60 % concentration of coolant should be used. Operation Vehicle Usage (Desired Mixture) Current Mixture Coolant Drain Add Amount of Honda Extreme Cold Weather Antifreeze/Coolant Type 2 (100% concentrate) Then add Honda Long Life Antifreeze/Coolant Type 2 (50/50) Coolant Change Normal Area (50/50) 50/50 60/40 unknown Drain radiator, engine block, and reservoir None Top off the cooling system Very Cold Area (60/40) 50/50 unknown Drain radiator, engine block, and reservoir About 1.3 L (44 fl oz) 60/40 About 1.1 L (37 fl oz) Engine Overhaul Normal Area (50/50) - - None Very Cold Area (60/40) - - About 1.1 L (37 fl oz) Coolant Winterizing Very Cold Area (60/40) 50/50 Drain about 2.0 L (68 fl oz) from radiator About 1.1 L (37 fl oz) unknown (1) Drain radiator, engine block, and reservoir (1) When you want to winterize the coolant with the minimum amount of coolant change but the current coolant concentration in the vehicle is unknown, you must drain all coolant from the cooling system. Engine Coolant Capacities (Including the coolant reservoir capacity of 0.475 L (0.1255 US gal) At Coolant Change 5.50 L (1.453 US gal) After Engine Overhaul 6.51 L (1.720 US gal)
10. Splash Shield Install the splash shield (A).
11. Maintenance Minder Reset After doing all procedures, select the individual maintenance item you wish to reset with the HDS (See the Maintenance Minder General Information).

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1. Radiator Cap Wait until the engine is cool, then carefully remove the radiator cap.
2. Vehicle Lift Raise the vehicle on a lift, and make sure it is securely supported.
3. Splash Shield Remove the splash shield (A).
4. Radiator Coolant - Replacement Loosen the drain plug (A), and drain the coolant.
5. Front Grille Cover Remove the front grille cover (A). If necessary, remove the front bumper upper duct (A).
6. Radiator Mounting Bracket, Upper Both Remove the radiator mount upper brackets/cushions (A), and the A/C condenser upper mount brackets (B).
7. Bulkhead - Removal Disconnect the connectors (A). Remove the harness clamps (B). Remove the bulkhead (A).
8. Radiator Assembly Disconnect the upper radiator hose. Disconnect the lower radiator hose (A). Disconnect the ECT sensor 2 connector (B). Remove the harness clamp (C). Without ATF warmer: Disconnect the ATF cooler hoses (D). Pull up the radiator assembly.
9. Coolant Reservoir Remove the coolant reservoir.
10. A/C Condenser Fan Shroud Assembly Remove the A/C condenser fan shroud assembly.
11. Radiator Fan Shroud Assembly Remove the radiator fan shroud assembly.
12. ECT Sensor 2 (for Radiator After Removing) Remove ECT sensor 2.

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1. ECT Sensor 2 (for Radiator After Removing) Install ECT sensor 2.
2. Radiator Fan Shroud Assembly Install the radiator fan shroud assembly.
3. A/C Condenser Fan Shroud Assembly Install the A/C condenser fan shroud assembly.
4. Coolant Reservoir Install the coolant reservoir.
5. Radiator Assembly Install the radiator. Connect the upper radiator hose. Connect the ECT sensor 2 connector (A). Install the clamp (B). Connect the ATF cooler hoses (C) and the lower radiator hose (D). Without ATF warmer: Connect the ATF cooler hose.
6. Bulkhead - Installation Install the bulkhead (A). Install the harness clamps (A). Connect the connectors (B).
7. Radiator Mounting Bracket, Upper Both Install the radiator mount upper bracket/cushion (A), and the brackets (B).
8. Front Grille Cover Install the front bumper upper duct (A). Install the front grille cover (A).
9. Radiator Coolant - Replacement Follow the chart and pour coolant into the radiator up to the base of the filler neck. NOTE: Use Honda Long Life Antifreeze/Coolant Type 2, and if necessary add Honda Extreme Cold Weather Antifreeze/Coolant Type 2 (concentrate). Using a non-Honda 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. Honda Extreme Cold Weather Antifreeze/Coolant Type 2 is a 100 % concentration coolant. Do not add water to either coolant. If the vehicle is regularly driven in very low temperatures (below -22 °F (-30 °C), a 60 % concentration of coolant should be used. Operation Vehicle Usage (Desired Mixture) Current Mixture Coolant Drain Add Amount of Honda Extreme Cold Weather Antifreeze/Coolant Type 2 (100 % concentrate) Then add Honda Long Life Antifreeze/Coolant Type 2 (50/50) Coolant Change Normal Area (50/50) 50/50 60/40 unknown Drain radiator, engine block, and reservoir None Top off the cooling system Very Cold Area (60/40) 50/50 unknown Drain radiator, engine block, and reservoir About 1.3 L (44 fl oz) 60/40 About 1.2 L (41 fl oz) Engine Overhaul Normal Area (50/50) - - None Very Cold Area (60/40) - - About 1.2 L (41 fl oz) Coolant Winterizing Very Cold Area (60/40) 50/50 Drain about 2.0 L (68 fl oz) from radiator About 1.2 L (41 fl oz) unknown (1) Drain radiator, engine block, and reservoir (1) When you want to winterize the coolant with the minimum amount of coolant change but the current coolant concentration in the vehicle is unknown, you must drain all coolant from the cooling system. Engine Coolant Capacities (Including the coolant reservoir capacity of 0.475 L (0.1255 US gal) Except K24Z7 engine Manufacturer Capacity At Coolant Change DENSO 5.59 L (1.477 US gal) TRAD 5.50 L (1.453 US gal) After Engine Overhaul (M/T) DENSO 6.42 L (1.696 US gal) TRAD 6.33 L (1.672 US gal) After Engine Overhaul (A/T) DENSO 6.56 L (1.732 US gal) TRAD 6.47 L (1.709 US gal) After Engine Overhaul (CVT) DENSO 6.52 L (1.722 US gal) TRAD 6.43 L (1.699 US gal) Engine Coolant Capacities (Including the coolant reservoir capacity of 0.475 L (0.1255 US gal) K24Z7 engine Capacity At Coolant Change 5.5 L (1.45 US gal) After Engine Overhaul 6.7 L (1.78 US gal)
10. Splash Shield Install the splash shield (A).
11. Maintenance Minder Reset After doing all procedures, select the individual maintenance item you wish to reset with the HDS (See the Maintenance Minder General Information).

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1. Radiator-Test 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. Attach a commercially available pressure tester (A) to the radiator, and apply a pressure of 93-123 kPa (0.95-1.25 kgf/cm 2 , 13.5-17.8 psi). Inspect for engine coolant leaks and a drop in pressure. Remove the pressure tester, then reinstall the radiator cap.

Scheme 441

1. Radiator-Test 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. Attach a commercially available pressure tester (A) to the radiator, and apply a pressure of 93-123 kPa (0.95-1.25 kgf/cm 2 , 13.5-17.8 psi). Inspect for engine coolant leaks and a drop in pressure. Remove the pressure tester, then reinstall the radiator cap.

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1. Radiator Cap Wait until the engine is cool, then carefully remove the radiator cap.
2. Vehicle Lift Raise the vehicle on a lift, and make sure it is securely supported.
3. Radiator Coolant - Replacement Loosen the drain plug (A), and drain the coolant.
4. Intake Air Pipe Remove the intake air pipe.
5. Thermostat Housing Peripheral Assembly (Natural Gas Model) Disconnect the connectors (A). Remove the harness clamps (B). Disconnect the connector (A). Remove the harness clamp (B). Remove the harness bracket (A). Disconnect the lower radiator hose (B), the water bypass hose (C), and the heater hose (D).
6. Thermostat Remove the thermostat cover (A). Remove the thermostat (B).
7. Thermostat Housing (Natural Gas Model) Remove the thermostat housing.

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1. Thermostat Housing (Natural Gas Model) Install the thermostat housing (A), using a new gasket (B) and new O-ring (C).
2. Thermostat Install the thermostat (A) with a new rubber seal (B). Install the thermostat cover (C).
3. Thermostat Housing Peripheral Assembly (Natural Gas Model) Connect the lower radiator hose (A), the water bypass hose (B), and the heater hose (C). Install the harness bracket (D). Install the harness clamp (A). Connect the connector (B). Install the harness clamps (A). Connect the connectors (B).
4. Intake Air Pipe Install the intake air pipe.
5. Radiator Coolant - Replacement (Natural Gas Model) Follow the chart and pour coolant into the radiator up to the base of the filler neck. NOTE: Use Honda Long Life Antifreeze/Coolant Type 2, and if necessary add Honda Extreme Cold Weather Antifreeze/Coolant Type 2 (concentrate). Using a non-Honda 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. Honda Extreme Cold Weather Antifreeze/Coolant Type 2 is a 100% concentration coolant. Do not add water to either coolant. If the vehicle is regularly driven in very low temperatures (below -22 °F (-30 °C), a 60 % concentration of coolant should be used. Operation Vehicle Usage (Desired Mixture) Current Mixture Coolant Drain Add Amount of Honda Extreme Cold Weather Antifreeze/Coolant Type 2 (100% concentrate) Then add Honda Long Life Antifreeze/Coolant Type 2 (50/50) Coolant Change Normal Area (50/50) 50/50 60/40 unknown Drain radiator, engine block, and reservoir None Top off the cooling system Very Cold Area (60/40) 50/50 unknown Drain radiator, engine block, and reservoir About 1.3 L (44 fl oz) 60/40 About 1.1 L (37 fl oz) Engine Overhaul Normal Area (50/50) - - None Very Cold Area (60/40) - - About 1.1 L (37 fl oz) Coolant Winterizing Very Cold Area (60/40) 50/50 Drain about 2.0 L (68 fl oz) from radiator About 1.1 L (37 fl oz) unknown (1) Drain radiator, engine block, and reservoir (1) When you want to winterize the coolant with the minimum amount of coolant change but the current coolant concentration in the vehicle is unknown, you must drain all coolant from the cooling system. Engine Coolant Capacities (Including the coolant reservoir capacity of 0.475 L (0.1255 US gal) At Coolant Change 5.50 L (1.453 US gal) After Engine Overhaul 6.51 L (1.720 US gal)
6. Maintenance Minder Reset After doing all procedures, select the individual maintenance item you wish to reset with the HDS (See the Maintenance Minder General Information).

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1. Radiator Cap Wait until the engine is cool, then carefully remove the radiator cap.
2. Vehicle Lift Raise the vehicle on a lift, and make sure it is securely supported.
3. Radiator Coolant - Replacement Loosen the drain plug (A), and drain the coolant.
4. Intake Air Pipe Remove the intake air pipe.
5. EGR Pipe Remove the EGR pipe (A).
6. Thermostat Housing Peripheral Assembly Disconnect the connectors (A). Remove the harness clamps (B). Except CVT CVT Disconnect the connector (A). Remove the harness clamp (B). Remove the harness bracket (A). Disconnect the lower radiator hose (B), the water bypass hose (C), and the heater hose (D). Except M/T M/T
7. EGR Valve Disconnect the connector. Remove the EGR valve (A).
8. Thermostat Remove the thermostat cover (A). Remove the thermostat (B).
9. Thermostat Housing Remove the thermostat housing.

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1. Thermostat Housing Install the thermostat housing (A), using a new gasket (B) and new O-ring (C).
2. Thermostat Install the thermostat (A) with a new rubber seal (B). Install the thermostat cover (C).
3. EGR Valve Install the EGR valve (A) with a new gasket (B). Connect the connector.
4. Thermostat Housing Peripheral Assembly Connect the lower radiator hose (A), the water bypass hose (B), and the heater hose (C). Install the harness bracket (D). Except M/T M/T Install the harness clamp (A). Connect the connector (B). Install the harness clamps (A). Connect the connectors (B). Except CVT CVT
5. EGR Pipe Install the EGR pipe (A) with new gaskets (B).
6. Intake Air Pipe Install the intake air pipe.
7. Radiator Coolant - Replacement Follow the chart and pour coolant into the radiator up to the base of the filler neck. NOTE: Use Honda Long Life Antifreeze/Coolant Type 2, and if necessary add Honda Extreme Cold Weather Antifreeze/Coolant Type 2 (concentrate). Using a non-Honda 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. Honda Extreme Cold Weather Antifreeze/Coolant Type 2 is a 100 % concentration coolant. Do not add water to either coolant. If the vehicle is regularly driven in very low temperatures (below -22 °F (-30 °C), a 60 % concentration of coolant should be used. Operation Vehicle Usage (Desired Mixture) Current Mixture Coolant Drain Add Amount of Honda Extreme Cold Weather Antifreeze/Coolant Type 2 (100 % concentrate) Then add Honda Long Life Antifreeze/Coolant Type 2 (50/50) Coolant Change Normal Area (50/50) 50/50 60/40 unknown Drain radiator, engine block, and reservoir None Top off the cooling system Very Cold Area (60/40) 50/50 unknown Drain radiator, engine block, and reservoir About 1.3 L (44 fl oz) 60/40 About 1.2 L (41 fl oz) Engine Overhaul Normal Area (50/50) - - None Very Cold Area (60/40) - - About 1.2 L (41 fl oz) Coolant Winterizing Very Cold Area (60/40) 50/50 Drain about 2.0 L (68 fl oz) from radiator About 1.2 L (41 fl oz) unknown (1) Drain radiator, engine block, and reservoir (1) When you want to winterize the coolant with the minimum amount of coolant change but the current coolant concentration in the vehicle is unknown, you must drain all coolant from the cooling system. Engine Coolant Capacities (Including the coolant reservoir capacity of 0.475 L (0.1255 US gal) Except K24Z7 engine Manufacturer Capacity At Coolant Change DENSO 5.59 L (1.477 US gal) TRAD 5.50 L (1.453 US gal) After Engine Overhaul (M/T) DENSO 6.42 L (1.696 US gal) TRAD 6.33 L (1.672 US gal) After Engine Overhaul (A/T) DENSO 6.56 L (1.732 US gal) TRAD 6.47 L (1.709 US gal) After Engine Overhaul (CVT) DENSO 6.52 L (1.722 US gal) TRAD 6.43 L (1.699 US gal) Engine Coolant Capacities (Including the coolant reservoir capacity of 0.475 L (0.1255 US gal) K24Z7 engine Capacity At Coolant Change 5.5 L (1.45 US gal) After Engine Overhaul 6.7 L (1.78 US gal)
8. Maintenance Minder Reset After doing all procedures, select the individual maintenance item you wish to reset with the HDS (See the Maintenance Minder General Information).

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1. Radiator Cap Wait until the engine is cool, then carefully remove the radiator cap.
2. Vehicle Lift Raise the vehicle on a lift, and make sure it is securely supported.
3. Radiator Coolant - Replacement Loosen the drain plug (A), and drain the coolant.
4. Splash Shield Remove the splash shield (A).
5. Thermostat Disconnect the lower radiator hose (A). Remove the thermostat assembly (B).