Parts for your 2019 Mitsubishi Asx-Heater core

2019 Mitsubishi ASX heater-core: what it does and how to look after it

Yes, the 2019 Mitsubishi ASX is fitted with a heater core. This is confirmed in Mitsubishi Motors’ service information (Group 55A: Heater, Air Conditioner and Ventilation) for the GA/GF-series ASX/RVR/Outlander Sport and in the Mitsubishi ASA electronic parts catalogue, which lists a “heater radiator” (heater core) inside the HVAC unit for 2019 build vehicles.

The heater core is a small radiator under the dash that uses engine coolant to warm cabin air. As hot coolant flows through its tubes, the blower pushes air across the fins and into the vents, giving toasty heat on cold mornings and quick demisting of the windscreen. Because it’s part of the engine’s cooling loop, the heater core also helps stabilise coolant temperatures under varying loads, especially on cooler days.

Day to day, there’s not much the driver needs to do beyond basic cooling system care. Stick to the correct long‑life coolant meeting Mitsubishi specs, keep the level right, and change it at the intervals in the ASX service schedule. A fresh cabin filter also keeps airflow healthy and reduces debris that can settle on the core’s fins. Avoid “stop‑leak” quick fixes, they can clog the tiny passages in the heater core and the rest of the cooling system.

Typical clues the heater core needs attention include a sweet coolant smell in the cabin, oily film on the inside of the windscreen, fogging that clears slowly, damp carpet (often on the left front floor in RHD cars), poor cabin heat, or unexplained coolant loss. A workshop can confirm with a cooling‑system pressure test and dye/UV inspection, sometimes a borescope helps spot seepage at the HVAC box drains.

Replacement on the 2019 ASX is a fairly involved, dash‑out job. The HVAC housing usually needs to be split, and on many variants the A/C refrigerant must be safely recovered to remove the case before re‑gassing on reassembly. Expect several hours of labour, fresh coolant, and new seals/O‑rings. If the core isn’t leaking but heat is weak, a careful low‑pressure backflush may restore flow, if there’s corrosion or coolant inside the cabin, replacement is the proper fix.

• Pro tips: run the heater periodically year‑round, change coolant on time, and replace the cabin filter every 15,000–20,000 km to keep the ASX heater core happy.

Does the 2019 Mitsubishi ASX actually have a heater core?

It does. Mitsubishi’s service manual (Group 55A) for the GA/GF‑series ASX/RVR/Outlander Sport and the Mitsubishi ASA parts catalogue both list a heater radiator (heater core) in the HVAC module for 2019 models.

How much does a heater core replacement cost in Australia or New Zealand?

Ballpark figures: parts typically $200–$450 AUD/NZD, with 6–10 hours of labour depending on workshop rates and whether the A/C system needs to be de‑gassed and re‑gassed. Drive‑away totals are commonly $900–$2,000 AUD or $1,200–$2,500 NZD. Quotes vary with trim level, workshop rates, and what’s replaced while it’s apart (seals, coolant, cabin filter).

Can a blocked heater core be flushed instead of replaced?

Often, yes. A gentle reverse flush with low pressure can clear sediment and restore heat. If the core is leaking, heavily corroded, or contaminated by sealant, replacement is the reliable cure. Always refill with the correct coolant and bleed the system to prevent airlocks.