VolvoEngine Parts

20463750 Thermostat — Volvo FMX FE Series trucks — FH400

This thermostat is a temperature-sensitive valve that controls the flow of coolant through the engine's cooling system, maintaining optimal operating temperature. It is manufactured to meet Volvo's precise specifications, ensuring accurate temperature regulation unlike a stuck-open or stuck-closed thermostat. Symptoms of a faulty thermostat include the engine running too cool (poor heater performance, reduced fuel efficiency) or overheating (steam from the engine bay, coolant loss).

Thermostat – Part No 20463750 – 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

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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 TypeThermostat
MaterialMetal, Wax Pellet, Rubber Seal
ApplicationEngine Cooling System
Service LifeReplace every 2-3 years or as needed
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

The first sign of a failing thermostat is often a noticeable deviation from the engine's normal operating temperature, either running too cold or too hot. If the thermostat sticks closed, the engine will quickly overheat, potentially leading to severe internal damage. If it sticks open, the engine may run inefficiently and the heater may not provide adequate warmth, especially in colder climates.

Installation Tip

Before removing the old thermostat, ensure the cooling system is properly drained to minimize coolant spillage and contamination. When installing the new thermostat, make sure it is seated correctly in its housing and that the bleed hole (if present) is oriented properly.

Service Note

When replacing the thermostat, it is recommended to inspect the radiator hoses for signs of swelling or cracking and to check the condition of the coolant.