VolvoEngine Parts

21271982 Expansion Tank Sensor — Volvo FMX FE Series trucks — FH400

This sensor monitors the coolant level within the engine's expansion tank, providing critical data to the vehicle's control unit. It is manufactured to precise Volvo specifications, ensuring accurate readings and reliable performance compared to a faulty sensor that might give false low or high readings. A malfunctioning expansion tank sensor can lead to the engine overheating warning light illuminating or the temperature gauge showing incorrect levels.

Expansion Tank Sensor – Part No 21271982 – Volvo Spare Part
Part Specifications
BrandVolvo
CategoryEngine Parts
ConditionAftermarket — OEM Specification
DispatchSame-day from Mumbai (before 3 PM IST)
GST InvoiceAvailable — all orders
Export DocsCommercial invoice, packing list, COO

Compatible Models

Always verify with serial number before ordering.

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Installation & Application Notes

Inspect mating surfaces for wear before fitting. Use torque specs from service manual. Replace gaskets and seals as a set — reusing compressed gaskets causes oil leaks. Clean all oil passages with compressed air.

Always consult the OEM service manual for model-specific torque values and procedures. WhatsApp our technical team if you need fitment guidance.

Part TypeExpansion Tank Sensor
MaterialPlastic and electronic components
ApplicationCooling system expansion tank
Service LifeReplace if faulty or as per diagnostic codes
CompatibilityVolvo specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

The first indication of a faulty expansion tank sensor is often an inaccurate coolant level reading on the dashboard or the illumination of the coolant level warning light. If the issue persists, the engine's temperature monitoring system may not receive correct data, potentially leading to undetected overheating. This could result in significant engine damage due to prolonged operation at excessive temperatures.

Installation Tip

Ensure the cooling system is completely cool before attempting to remove the old sensor to avoid burns. When installing the new sensor, ensure it is seated firmly and the electrical connector is securely attached.

Service Note

Inspect the coolant level and condition, and check the radiator cap for proper sealing.