Where is the rear heater core on a 2017 Dodge Durango?
The rear heater core in a 2017 Dodge Durango is located inside the rear HVAC housing, behind the rear seating area, and is not mounted in the engine bay. Access typically requires interior trim removal and may involve working near or under the rear seat, depending on your trim and rear climate setup.
Understanding the rear HVAC layout in the Durango
The Durango’s rear climate system shares components with the front HVAC, but the rear heater core and related plumbing are housed within a dedicated rear HVAC module. This unit sits behind the rear seating area and feeds air to rear ducts for passenger comfort. Availability and access can vary by trim level and whether your model has a dedicated rear A/C/heating control.
To locate and inspect the rear heater core, follow these general steps. Note that exact steps can vary by trim and vehicle condition.
- Park safely, apply the parking brake, and disconnect the negative battery cable to prevent any electrical shorts while you work near interior panels.
- Remove the rear seat bottom cushion to gain access to the rear HVAC housing and any lower panels that cover the heater core area.
- Lift or remove adjacent trim panels or carpeting in the rear cargo area or footwell to expose the rear HVAC housing and the heater core access point.
- Open the rear HVAC housing access panel and check the heater core inlet/outlet hoses for signs of leaks, corrosion, or loose clamps.
- If replacement is required, carefully detach hoses, remove the old core from the housing, and install the new core following the service manual guidelines, ensuring all connections are secure and no air leaks remain.
Following these steps will help you locate and inspect the rear heater core for signs of failure or for planning a replacement. If you’re unsure or uncomfortable with interior HVAC work, consult a certified mechanic to avoid damaging ducts, wires, or coolant lines.
Common signs the rear heater core may be failing
Rear heater core issues often present with noticeable changes in rear climate performance or indicators of a leak. Here are common symptoms to watch for.
- Weak or no heat coming from rear vents, especially when the front heater is producing heat.
- Uneven temperatures between front and rear zones, or a temperature swing in the rear cabin.
- Sweet coolant odor inside the cabin or damp carpeting in the rear footwell from a leak.
- Foggy rear windows without a front fogging cause or visible coolant puddling near the rear seats.
- Coolant loss with no obvious external leak, or low coolant level warning on the dashboard.
These signs can indicate a faulty rear heater core, a leaking rear HVAC hose, or related ducting issues. If you notice any of them, it’s wise to perform a diagnostic check and, if needed, have the system inspected by a pro to prevent further damage.
Maintenance and safety considerations
Working with the Durango’s HVAC system involves coolant and electrical components. Always take proper safety steps, including disconnecting the battery and allowing the system to depressurize if you’re planning a repair. Use appropriate tools, replace gaskets or O-rings as required, and ensure all hose clamps are secure to prevent leaks.
Summary
For a 2017 Dodge Durango, the rear heater core sits inside the rear HVAC housing behind the rear seating area, not in the engine bay. Access typically requires removing rear interior panels and seating to reach the heater core. If you’re diagnosing a heat issue or planning a replacement, inspect the rear HVAC housing, hoses, and clamps, and consider professional service if you’re unsure of the procedure.
