How to Replace the Heater Core in a Mitsubishi Eclipse

by Editorial TeamUpdated November 07, 2017

Items you will need

  • Replacement heater core

  • Wrench

  • Screwdriver

  • Engine coolant

How to Replace the Heater Core in a Mitsubishi Eclipse. Like most models, replacing a Mitsubishi Eclipse's heater core isn't as difficult as getting to the core itself. You must remove the entire instrument panel first, which requires a second person's help and a complete knowledge of the panel itself.

Make sure the Eclipse's tires are facing straight forward. Disconnect the cable from the negative battery terminal and wait a minute. Drain the engine cooling system and discharge the air conditioning system.

Take out the center console box and lid assemblies, along with the nearby switches and the gear shift assembly. Remove the front and rear consoles, driver's air bag, steering wheel and steering assemblies.

Disassemble and remove the instrument panel. Remove the front pillar trim panel, side cover, fog lamp switch, hood release handle, meter bezel, center panel, center air outlet, radio, heater control, center hood, Multi-center display, center speaker, glove box and passenger's air bag.

Disconnect the instrument panel reinforcements, knee absorbers. auto-cruise control immobilizer control units, joint duct and strut tower bar assembly.

Remove the air intake hose, air conditioning pipe connection, expansion valve, heater hose and thermistor sensor. Remove the evaporator, automatic compressor controller and water shut motor, and you can now remove the heater core.

Install the replacement heater core. Replace all consoles, hoses, assemblies panels and columns in the reverse order of removal.

Refill the cooling system, using new coolant if the old coolant doesn't appear to be of good quality. Recharge the air conditioning system as well.


Keep the steering column's tilt lever locked while the steering wheel is disassembled. If the lever is released during removal, you can't reinstall the column correctly and may damage the collision energy absorbing mechanism.

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