Technical Specifications: Genuine VOLVO Engine Thermostat Assembly 20450736

Genuine VOLVO Engine Thermostat Assembly — Coolant‑Flow Temperature Regulator Solution

The Genuine VOLVO Premium Heavy‑Duty Engine Thermostat Assembly (Part Numbers: 20450736 / VOE 20450736 / 888848), also known as Coolant Flow Temperature Regulator, is a critical cooling‑system component for VOLVO B‑series, D‑series & E‑series mid‑range diesel engines. Installed in the cylinder‑head upper water outlet housing, this wax‑actuated mechanical valve controls coolant circulation: closed for fast engine warm‑up, fully open at optimal operating temperature to route coolant to radiator. Replacing stuck, sluggish or corroded thermostats prevents engine overheating, cold‑run fuel‑efficiency loss, cylinder‑head cracking and stabilizes engine thermal balance under heavy hydraulic loads.

Core Technical Advantages

High‑Stability Thermal Wax Actuator: Premium wax pellet delivers precise opening‑temperature performance over millions of thermal cycles.
Corrosion‑Resistant Brass‑Steel Construction: Heavy‑gauge brass body & stainless‑steel rod resist coolant cavitation, lime‑scale buildup and chemical corrosion.
Fatigue‑Resistant Precision Return Spring: Maintains consistent tension for reliable closed‑state sealing under prolonged high‑heat operation.
Integrated Jiggle Air‑Bleed Valve: Built‑in pin releases trapped air during coolant refills to eliminate cooling‑system air locks.

Technical Specifications

Engineering Parameter	Technical Data / Specification Details
Component Assembly Part Numbers	20450736 / VOE 20450736 / 888848
Component Classification	Heavy‑Duty High‑Flow Liquid Coolant Mechanical Temperature Regulator Core
System Compatibility	High‑Pressure Closed‑Loop Diesel Engine Radiator Cooling Circuits
Material	Anti‑Cavitation Brass Body + High‑Tensile Stainless Steel Guide Rod
Actuation Element	Hermetically‑Sealed Copper‑Coated High‑Sensitivity Thermal Wax Capsule
Sealing Feature	Precision Edge Geometry for Leak‑Free Mating with OEM Housing O‑Rings

Master Application Fleet Guide

This thermostat fits VOLVO B‑D‑E‑series crawler/wheeled excavators:

B‑Series Excavators: EC135B, EC140B, EC160B, EC180B, EC200B, EC210B, EC240B, EC290B, EW145B
D‑E‑Series Excavators: EC200D, EC210D, EC220D, EC250D, EC300D, EC200E, EC210E, EC220E

Critical B2B Procurement & Maintenance Guidelines

B2B Procurement Strategy

Wax‑capsule degradation, mineral scaling and mechanical seizure cause thermostat failure, leading to engine overheating or cold‑run damage. Stock 20450736/888848 for regular maintenance & overhaul kits. Cross‑sell with housing gaskets, water‑pump gaskets, temperature sensors (14513142), radiator caps and long‑life coolant additives.

Common Failure Symptoms

Sudden overheating alerts on monitor (14609502) caused by thermostat stuck closed, blocking coolant flow to radiator
Persistent low operating temperature & cold cabin heater from permanently‑open thermostat leading to oil dilution and carbon buildup
Coolant leakage & crusty anti‑freeze deposits at thermostat housing due to distorted flange or failed gasket

Best Practice Overhaul Advisory:
Allow engine to fully cool, disconnect main battery switch (17418494), drain coolant below thermostat housing level. Remove housing cover, clean old gasket/lime‑scale residue, install new thermostat with spring side downward and jiggle pin upward. Fit new OEM rubber gasket (no silicone RTV), torque housing bolts evenly to OEM specs, refill with pre‑mixed long‑life coolant, bleed air bubbles, top‑off coolant and verify stable operating temperature.

Global Brand Cross‑Reference Matrix

Brand	Cross‑Reference Part Numbers
VOLVO Genuine PN	20450736 / VOE 20450736
Factory Interchange	888848
Component Group	Coolant Flow Thermostat Core / Main Engine Temperature Regulator / Liquid Cooling Thermal Expansion Valve

Commercial Inquiry & Global Logistics:
Supplier: Xuzhou Sinoswift Import & Export Co., Ltd.
Contact: +86 13701956981
Email: [email protected]
Logistics: Global Sea Freight and Fast‑Track Industrial Express Ready

All manufacturer names and model designations are for compatibility reference only. These genuine thermostats deliver precise engine‑cooling thermal control for global VOLVO construction, quarry and mining machinery fleets.