Parts for your 2017 Mitsubishi Asx-Heater tap

2017 Mitsubishi ASX Heater Tap — What’s Fitted and What Isn’t

For the 2017 Mitsubishi ASX sold in Australia and New Zealand, there is no heater tap (also known as a heater control valve) fitted from the factory. Temperature inside the cabin is managed by an air-mix/blend door inside the HVAC box, while engine coolant flows continuously through the heater core. This design is confirmed by Mitsubishi’s workshop documentation and parts catalogues for the ASX/RVR/Outlander Sport platform.

Technical sources that back this up include:

• Mitsubishi Motors Service Manual (RVR/ASX/Outlander Sport, 2016–2017), Group 55A – Heating, Ventilation and Air Conditioning: System description shows temperature control via an air-mix damper with continuous coolant flow through the heater core.
• Mitsubishi Motors Service Manual, Group 14 – Cooling: Cooling circuit diagrams do not indicate a heater water control valve in-line with the heater hoses.
• Mitsubishi ASA Electronic Parts Catalogue (Oceania, 2017 ASX): Heater hose/piping listings do not include a heater tap/control valve for this model year.

Why no heater tap? Mitsubishi engineered the ASX’s HVAC to regulate cabin temperature by blending air rather than switching coolant on and off to the heater core. That approach keeps the system simpler, with fewer leak points and less to fail. It also helps with fast demisting and stable engine temps because hot coolant is always available at the heater core.

What should owners focus on instead? A few smart maintenance checks go a long way:

• Coolant condition and level: Use the correct spec coolant and keep it fresh to prevent heater core restriction and corrosion.
• Heater hoses and clamps: Inspect for swelling, weeping, or softness, especially at the firewall connections.
• Air-mix/blend door operation: If temperatures don’t change as commanded, the blend door actuator or control linkage may need inspection or recalibration.
• Cabin filter: A clogged filter reduces airflow and can make the heater feel weak even when everything else is fine.

Bottom line: on a 2017 ASX there’s no heater tap to replace or service. Keep the coolant right, ensure the heater core and hoses are healthy, and make sure the blend door does its job — that’s the winning combo for reliable heat and demist performance.

Does a 2017 Mitsubishi ASX have a heater tap?

No. The 2017 ASX uses a constant-flow heater core and controls cabin temperature with an air-mix/blend door inside the HVAC unit. There’s no coolant shut-off valve in the heater hose circuit on AU/NZ models.

Why is there no heat or it’s stuck hot on my 2017 ASX if there’s no heater tap?

Start with coolant level and thermostat health, then consider a partially blocked heater core. If coolant and flow are fine, the likely culprit is the air-mix actuator or door not moving correctly. A scan/calibration or actuator replacement may be needed after proper diagnosis.

Where are the heater hoses on a 2017 ASX?

They run from the engine bay to the heater core connections on the firewall. You’ll typically see two rubber hoses entering the cabin bulkhead. Check them when the engine is cold, look for leaks, perishing, or loose clamps.