Acura RL. Manual - part 404

11. Start the engine and let it run until it warms up (the radiator fan comes on at least twice).  

12. Turn off the engine. Check the level in the radiator and add Acura Long Life Antifreeze/Coolant Type 

2, if needed. 

13. Put the radiator cap on tightly, then run the engine again and check for leaks.  

14. Clean up any spilled engine coolant.  

THERMOSTAT REPLACEMENT 

1. Make sure you have the anti-theft codes for the audio system and navigation system. Make sure the 

ignition switch is OFF.  

2. Disconnect the negative cable from the battery, then the positive cable. Remove the battery.  

3. Drain the engine coolant (see COOLANT CHECK ).  

4. Remove the ground cable and thermostat cover, then remove the thermostat. 

Fig. 13: Identifying Thermostat Components And Ground Cable With Torque Specifications 
Courtesy of AMERICAN HONDA MOTOR CO., INC.

NOTE:

Removing the radiator cap while the engine is hot can cause the 
coolant to spray out. Always let the engine and radiator cool before 
removing the cap.

 

2007 Acura RL 

2005-08 ENGINE Cooling System - RL

  

me 

 

Friday, June 05, 2009 3:11:22 PM

Page 8 

© 2005 Mitchell Repair Information Company, LLC. 

5. Install the thermostat with a new rubber seal and with the pin on the top side.  

6. Install the battery. Clean the battery posts and cable terminals then assemble them and apply grease to 

prevent corrosion.  

7. Refill the radiator with engine coolant, then bleed air from the cooling system (see step 8 ).  

8. Clean up any spilled engine coolant.  

9. Do the steering column position memorization procedure (see STEERING COLUMN POSITION 

MEMORIZATION ).  

10. Enter the anti-theft codes for the audio system and the navigation system.  

WATER PASSAGE REPLACEMENT 

1. Make sure you have the anti-theft codes for the audio system and navigation system. Make sure the 

ignition switch is OFF.  

2. Disconnect the negative cable from the battery, then the positive cable. Remove the battery.  

3. Drain the engine coolant (see COOLANT CHECK ).  

4. Remove the air cleaner (see AIR CLEANER REMOVAL/INSTALLATION ).  

5. Remove the two bolts securing the harness holder and the two bolts securing the vacuum line, then 

remove the harness clamp (see step 18 under CYLINDER HEAD REMOVAL ).  

6. Disconnect the upper radiator hose, lower radiator hose, heater hoses, and water bypass hoses from 

the water passage. Remove the water passage. 

Fig. 14: Identifying EGR Valve, ECT Sensors, Water Passage, Connecting Pipe And Gaskets 
With Torque Specifications 
Courtesy of AMERICAN HONDA MOTOR CO., INC.

 

2007 Acura RL 

2005-08 ENGINE Cooling System - RL

  

me 

 

Friday, June 05, 2009 3:11:22 PM

Page 9 

© 2005 Mitchell Repair Information Company, LLC. 

7. Install the water passage in the reverse order of removal.  

8. Install the battery. Clean the battery posts and cable terminals, then assemble them and apply grease to 

prevent corrosion.  

9. Refill the radiator with engine coolant, then bleed air from the cooling system (see step 8 ).  

10. Clean up any spilled engine coolant.  

11. Do the steering column position memorization procedure (see STEERING COLUMN POSITION 

MEMORIZATION ).  

12. Enter the anti-theft codes for the audio system and the navigation system.  

RADIATOR AND FAN REPLACEMENT 

1. Drain the engine coolant (see COOLANT CHECK ).  

2. Remove the right upper fender trim, battery trim, left upper fender trim, then remove the upper grille 

cover (see step 1 under RFC UNIT REPLACEMENT ). Remove the splash shield (see step 33 
under ENGINE REMOVAL ).  

3. Remove the air cleaner (see AIR CLEANER REMOVAL/INSTALLATION ).  

4. Remove the automatic transmission fluid (ATF) cooler hoses from the radiator (see ATF COOLER 

HOSE REPLACEMENT ). Remove the upper radiator hose and lower radiator hose from the 
radiator. 

Fig. 15: Identifying Radiator And Fan Components With Torque Specification 
Courtesy of AMERICAN HONDA MOTOR CO., INC.

 

2007 Acura RL 

2005-08 ENGINE Cooling System - RL

  

me 

 

Friday, June 05, 2009 3:11:22 PM

Page 10 

© 2005 Mitchell Repair Information Company, LLC. 

5. Disconnect the RFC unit connectors. Remove the harness clamps and A/C compressor clutch 

connector.  

6. Remove the upper bracket cushions, then pull up the radiator.  

7. Disconnect the fan motor connectors, then remove the fan shroud assemblies and other parts from the 

radiator.  

8. Install the radiator in the reverse order of removal. Make sure the upper and lower cushions are set 

securely.  

9. Fill the radiator with engine coolant, then bleed air from the cooling system (see step 8 ). 

 

2007 Acura RL 

2005-08 ENGINE Cooling System - RL

  

me 

 

Friday, June 05, 2009 3:11:22 PM

Page 11 

© 2005 Mitchell Repair Information Company, LLC.