This content was compiled automatically and has not yet been reviewed by a technician. For reference only.
For reference only. Always confirm part numbers and procedures for your specific vehicle.
Fault diagnosis
BYD SEALION 5: Engine overheating with coolant leakage or a non-running fan
Engine overheating, reduced power or abnormal knocking may be accompanied by visible coolant leakage.
BYD SEALION 5: Engine overheating with coolant leakage or a non-running fan
Symptoms
- Engine overheating, reduced power or abnormal knocking may be accompanied by visible coolant leakage. [1]
Possible causes
- The manual requires checking the radiator, hoses and area under the vehicle for obvious leakage, and checking cooling fan operation; severe coolant depletion indicates possible system leakage. [1]
Checks
- Stop safely, switch off the A/C and secure the parked vehicle; if fluid or steam is being expelled, keep the bonnet closed until it stops. Check for visible leaks only when safe, stay away from the rotating fan and do not open caps while hot. [1]
What to do
- If leakage is present or the fan is not running, stop the engine and contact a BYD service provider. Wait until the entire system has cooled before inspection, repair and level checks according to the model requirements; do not open caps yourself while the system is pressurised. [1]
Applicability and limits
- Only applies to the BYD SEALION 5 configuration in the source; model year unconfirmed. DM dual-mode hybrid section; model year unspecified and must not be inferred from the publication date; the vehicle model database is empty and no model is linked. Do not extend to other models. Scope: unknown [1]
- DM dual-mode hybrid section; model year unspecified and must not be inferred from the publication date
Related part categories
- Cooling system / Cooling radiator / Cooling system [1]
- Cooling system / Coolant lines / Cooling system [1]
- Cooling system / Cooling fan / Cooling system [1]
Sources
[Source 1] BYD SEALION 5 Owner Handbook (Australian right-hand-drive project) — PDF pp.240–241 / printed pp.239–240, If the Engine is Overheated; PDF p.225 / printed p.224 Cooling System (accessed 2026-11-01)
https://www.bydauto.co.nz/storage/uploads/b11fc7ab-62ad-416f-a05a-db14c8e71479/BYD-Sealion-5-Owners-Handbook-compressed.pdf
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