VolvoHydraulic Parts

3946673 — Expansion Valve 3946673 For Volvo Truck Vhd Vnm Vnl Vhd

This expansion valve, also known as an expansion control valve or TX valve, is a key component in the air conditioning system of Volvo trucks, regulating the flow of refrigerant into the evaporator. It is designed to maintain optimal cabin temperature by controlling refrigerant expansion, performing reliably where a worn valve might allow incorrect refrigerant flow. Drivers may notice inadequate cooling or inconsistent cabin temperatures if this valve fails.

Expansion Valve 3946673 For Volvo Truck Vhd Vnm Vnl Vhd – Part No 3946673 – Volvo Spare Part
Part Specifications
BrandVolvo
CategoryHydraulic 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

Flush hydraulic lines before fitting new components. Use only manufacturer-specified hydraulic fluid. Check O-rings and backup rings for correct orientation. Bleed air from system after installation.

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

Part TypeExpansion Valve (TX Valve)
MaterialBrass and Aluminum
ApplicationAir Conditioning System Refrigerant Control
Service LifeReplace if AC performance degrades or during system service
CompatibilityVolvo 3946673
ConditionNew — OEM specification aftermarket

Failure Symptoms

The primary symptom of a failing expansion valve is a noticeable decrease in air conditioning cooling performance, often characterized by inconsistent temperatures. If the valve becomes stuck open, the evaporator may freeze up, reducing airflow. If it sticks closed, the AC system will likely blow warm air, rendering it ineffective.

Installation Tip

Ensure the AC system is properly evacuated of refrigerant before removing the old valve to prevent environmental release and personal injury. When installing, ensure the sensing bulb is securely attached to the evaporator outlet pipe in the correct orientation.

Service Note

Replace the receiver-drier (accumulator) whenever the AC system is opened, and consider flushing the system to remove any debris or contaminants.