Acura RL. Manual - part 581

SRS components are located in this area. Review the SRS component locations (see COMPONENT 
LOCATION INDEX ) and the precautions and procedures (see PRECAUTIONS AND PROCEDURES ) 
before doing repairs or service. 

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

2. Make sure the ignition switch is OFF, then disconnect the negative cable from the battery.  

3. Disconnect the suction and receiver lines from the evaporator core (see EVAPORATOR CORE 

REPLACEMENT ).  

4. From under the hood, open the cable clamp (A), then disconnect the heater valve cable (B) from the 

heater valve arm (C). Turn the heater valve arm to the fully opened position as shown. 

Fig. 133: Identifying Heater Valve Cable And Heater Valve Arm 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

5. When the engine is cool, drain the engine coolant from the radiator (see COOLANT CHECK ).  

6. Slide the hose clamps (A) back. Remove the bolt and water valve bracket, then disconnect the inlet 

heater hose (B) and the outlet heater hose (C) from the heater unit. 

Engine coolant will run out when the hoses are disconnected; drain it into a clean drip pan. Be sure 
not to let coolant spill on the electrical parts or the painted surfaces. If any coolant spills, rinse it off 
immediately. 

 

2007 Acura RL 

2005-08 HVAC HVAC - RL

  

me 

 

Friday, June 05, 2009 2:25:43 PM

Page 107  © 2005 Mitchell Repair Information Company, LLC. 

Fig. 134: Identifying Outlet & Inlet Heater Hoses And Water Valve Bracket With Torque 
Specifications 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

7. Remove the mounting nut from the heater unit. Take care not to damage or bend the fuel lines and the 

brake lines, etc. 

Fig. 135: Identifying Mounting Nut Of Heater Unit With Torque Specifications 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

8. Remove the dashboard (see DASHBOARD REPLACEMENT ).  

9. Disconnect the connectors (A) from the power tilt/ telescopic steering control unit, the adaptive front 

lighting control unit, the electronically controlled power steering control unit, and the daytime running 
lights control unit. Remove the relay (B) and the power tilt/telescopic steering control unit (C), then 
remove the self-tapping screws and the bracket (D). 

Fig. 136: Identifying Control Units And Connectors 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

10. Disconnect the connectors (A) from the driver's cool vent control motor, the driver's air mix control 

motor, the mode control motor, and the evaporator temperature sensor, then remove the wire harness 
clips (B). 

 

2007 Acura RL 

2005-08 HVAC HVAC - RL

  

me 

 

Friday, June 05, 2009 2:25:43 PM

Page 108  © 2005 Mitchell Repair Information Company, LLC. 

Fig. 137: Identifying Control Motors And Sensor Connectors, And Wire Harness Clips 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

11. Disconnect the connectors (A) from the blower motor, the power transistor, the control motor relay, 

the throttle actuator control module subharness, and dashboard wire harnesses. Remove the connector 
clip (B) and the wire harness clips (C). 

Fig. 138: Identifying Wire Harness Clips, Connector Clip And Connectors At Blower Unit 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

12. Disconnect the connectors (A) from the recirculation control motor, the passenger's cool vent control 

motor, the passenger's air mix control motor, and the rear vent control motor, and then remove the 
wire harness clip (B) and the wire harness (C). 

 

2007 Acura RL 

2005-08 HVAC HVAC - RL

  

me 

 

Friday, June 05, 2009 2:25:43 PM

Page 109  © 2005 Mitchell Repair Information Company, LLC. 

Fig. 139: Identifying Wire Harness Clip, Wire Harness And Control Motor(s) Connectors 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

13. Remove the clips (A), the mounting nuts, and the blower-heater unit (B). 

Fig. 140: Identifying Mounting Nuts, Blower-Heater Unit And Clips 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

14. Remove the self-tapping screws and the passenger's heater duct (A), and the expansion valve cover 

(B), then remove the bolts, and the expansion valve (C). Remove the self-tapping screws, the joint 
duct (D), and the heater core cover (E). Remove the self-tapping screws, the heater pipe brackets (F), 
and the grommets (G), and carefully pull out the heater core (H). 

 

2007 Acura RL 

2005-08 HVAC HVAC - RL

  

me 

 

Friday, June 05, 2009 2:25:43 PM

Page 110  © 2005 Mitchell Repair Information Company, LLC.