RDX L4-2.3L Turbo (2008)
Heater Core Case: Service and Repair
Heater Unit/Core Replacement
SRS components are located in this area. Review the SRS component locations and the 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), then write down the audio presets.
2. Make sure the ignition is OFF, then disconnect the negative cable from the battery.
3. Disconnect the A/C line from the evaporator core.
4. Remove the air cleaner housing assembly.
5. 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.
6. When the engine is cool, drain the engine coolant from the radiator.
7. From under the hood, slide the hose clamps (A) back. Disconnect the inlet heater hose (B) and the outlet heater hose (C) from the heater unit. Note
the orientation of the hose.
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.
8. Remove the mounting nut from the heater unit. Take care not to damage or bend the fuel lines or brake lines, etc.
