VolvoCooling System

20779978 Ac Clutch 400-440 — Volvo FMX FE Series trucks — FH400

This AC Clutch is a vital component for the air conditioning system, engaging and disengaging the compressor pulley to control refrigerant flow and cooling operation. It is manufactured to meet stringent OEM quality standards, ensuring reliable engagement and longevity compared to worn clutches that can slip or fail to engage. Operators may experience a lack of cold air, a distinct clicking or grinding noise when the AC is switched on, or the AC system not engaging at all if this clutch is faulty.

Ac Clutch 400-440 – Part No 20779978 – Volvo Spare Part
Part Specifications
BrandVolvo
CategoryCooling System
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

Flush cooling system with distilled water before refilling. Use pre-mixed coolant — never plain water, which causes corrosion. Pressure-test system after any cooling repair. Check thermostat by immersing in hot water — should open at rated temperature.

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

Part TypeAir Conditioning Compressor Clutch
MaterialSteel, electromagnetic coil, friction material
ApplicationAir conditioning system compressor
Service LifeReplace as needed, typically 5-7 years
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

The most common initial symptom of a failing AC clutch is a failure to engage, resulting in no cold air from the vents. If the clutch is slipping, you might hear a squealing or grinding noise when the AC is turned on. Continued operation with a faulty clutch can lead to excessive wear on the compressor pulley and drive belt, potentially causing secondary damage.

Installation Tip

Ensure the air gap between the clutch pulley and the compressor is set to the manufacturer's specification before final installation. Do not use excessive force when removing or installing the clutch assembly, as this can damage the compressor shaft.

Service Note

When replacing the AC clutch, inspect the drive belt for wear and proper tension, and check the compressor shaft seal for any signs of refrigerant leakage.