berndeule7
Terracan Overheating Speed Sensor
Summary of the thread
A 2004 Hyundai Terracan was experiencing overheating issues with the check engine light on, despite normal coolant levels and no visible leaks. The radiator fan was suspected of not engaging, potentially due to a defective speed sensor. After investigation, it was confirmed that the speed sensor was indeed faulty, causing the radiator fan malfunction. Replacing the speed sensor resolved the issue, stabilizing the engine temperature.
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4 comment(s)
berndeule7 (community.author)
Where is the thermal switch located in the Terracan's cooling system? Did your Terracan make any unusual fan noise, or none at all, before the overheating?
guenterjohnson39
I'm really not sure where the thermal switch is exactly, but a quick online search for the Hyundai Terracan cooling system diagram should help. I honestly didn't notice anything unusual before everything went haywire. I'd recommend taking it to a workshop; they'll figure it out faster.
berndeule7 (community.author)
The speed sensor was indeed defective, leading to the radiator fan malfunction. Replacing the speed sensor fixed it; the cooling system now works, and the engine temperature is stable. The repair cost 250€. Checking the thermal switch helped guide my troubleshooting.
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HYUNDAI
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TERRACAN
guenterjohnson39
Hey! I had something similar with my Terracan overheating and the check engine light. I'm no expert, but have you checked the thermal switch? It might be the culprit. I remember reading somewhere that if that switch goes bad, the fan won't kick on when it should. Just a thought!