Acura RL. Manual - part 402

4. If the continuity is not as specified, replace the switch. 

 

2007 Acura RL 

2005-08 BRAKES Collision Mitigation Brake System (CMBS) - RL

  

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2005-08 ENGINE

Cooling System - RL 

COMPONENT LOCATION INDEX 

Fig. 1: Identifying Cooling System Components Location 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

RADIATOR CAP TEST 

1. Remove the radiator cap (A), wet its seal with engine coolant, then install it on a commercially 

available pressure tester (B). 

 

2007 Acura RL 

2005-08 ENGINE Cooling System - RL

  

 

2007 Acura RL 

2005-08 ENGINE Cooling System - RL

  

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Fig. 2: Testing Radiator Cap 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

2. Apply a pressure of 93-123 kPa (0.95-1.25 kgf/cm

2

 , 14-18 psi). 

 

3. Check for a drop in pressure.  

4. If the pressure drops, replace the cap.  

RADIATOR TEST 

1. Wait until the engine is cool, then carefully remove the radiator cap, and fill the radiator with engine 

coolant to the top 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

2

 , 14-18 psi). 

Fig. 3: Testing Radiator For Engine Coolant Leaks 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

3. Inspect for engine coolant leaks and a drop in pressure.  

4. Remove the tester, then reinstall the radiator cap.  

FAN MOTOR TEST 

1. Disconnect the 2P connectors from the radiator fan motor (A) and condenser fan motor (B). 

 

2007 Acura RL 

2005-08 ENGINE Cooling System - RL

  

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Fig. 4: Identifying Radiator Fan Motor, Condenser Fan Motor And 2P Connectors 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

2. Test each motor by connecting battery power to terminal No. 1 and ground to terminal No. 2.  

3. If either motor fails to run or does not run smoothly, replace it (see RADIATOR AND FAN 

REPLACEMENT ).  

THERMOSTAT TEST 

Replace the thermostat if it is stuck open at room temperature. 

To test a closed thermostat: 

1. Suspend the thermostat (A) in a container of water. Do not let the thermometer (B) touch the bottom 

of the hot container. 

Fig. 5: Checking Thermostat Operation

 

2007 Acura RL 

2005-08 ENGINE Cooling System - RL

  

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