williamstorm58
Matrix Auxiliary Heater Error
Summary of the thread
A 2004 Hyundai Matrix diesel has an auxiliary heater that fails to activate, storing an error code. The issue could stem from a faulty temperature sensor or heat control system. However, the diagnosis confirmed a defective glow plug within the auxiliary heater unit as the cause. The recommended solution is to replace the glow plug, which was completed by a technician.
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4 comment(s)
williamstorm58 (community.author)
The heater is not blowing any air whatsoever and there are no unusual smells. I have not inspected the coolant level recently; could low coolant cause this, even if the primary heating system functions without issue?
dietersturm1
Yep, low coolant can definitely cause the auxiliary heater to shut down. They're sensitive! But with zero air and an error code, I'm still leaning towards that glow plug. Honestly, diagnosing it properly without specialist tools will be a headache. Bite the bullet and take it to a workshop. They'll pinpoint the problem in minutes.
williamstorm58 (community.author)
I consulted with a technician. The diagnosis confirmed a defective glow plug within the auxiliary heater unit. The repair, including parts and labor, was 440€.
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HYUNDAI
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MATRIX
dietersturm1
Sounds like a pain! Is it blowing any air at all, even if it's cold? Any weird smells, like burning plastic or coolant? Could be as simple as a fuse, but that error code makes me think it's more likely a faulty glow plug in the heater unit itself. Have you checked the coolant level recently? A coolant leak could also prevent it from firing up as a safety measure.