Thermostat Assembly for Opel OEM 4400311

Product Overview

A Thermostat Housing Assembly for Opel vehicles, held against OEM 4400311, 4401604, 4404262, 4404841, 9108311, 9109604 and 9112262. In service the part carries the wax element, housing, seals and — on mapped units — the heater and temperature sensor that govern warm-up. In service the part carries the wax element, housing, seals and — on mapped units — the heater and temperature sensor that govern warm-up. When it fails it usually shows cracked plastic housings and leaking sensor bosses, and the driver sees a gauge that never settles in the normal band, higher fuel consumption and thermostat fault codes. The part belongs to a cooling-system catalogue of more than 4000 types, which is the practical reason buyers consolidate a mixed pallet with us rather than splitting it across suppliers.

Key Benefits

• Inspection before despatch — Parts are inspected before they leave, which for this family means checking the sealing faces and the connector geometry that decide whether it fits.
• Matched to how the part actually fails — Cracked plastic housings and leaking sensor bosses are the reasons this reference is bought, so those are the features checked before packing.
• Aftermarket buyers, not one-off retail — Pricing and packing are set up for distributors and workshop chains buying by the carton, not for single-piece retail.
• One reference set on every document — OEM 4400311, 4401604, 4404262, 4404841, 9108311, 9109604 and 9112262 appears on the quotation, the packing list and the carton label, so a warehouse can check a delivery without opening the box.

Application Scenarios

Breakdown repair

The vehicle is off the road and the part has to be right the first time, which makes the reference match the whole decision. This reference, 4400311, is bought for exactly that situation on Opel vehicles.

Rebuild of an obsolete platform

The original reference is no longer produced, so the part is made from a supplied sample. For 4400311 the practical step is confirming the opening temperature, the housing outline and whether the unit is map-controlled before the order is placed.

Mixed container for a distributor

A quarterly container is filled across families — intake, charge air, coolant and thermostat lines — to a single packing list. This reference, 4400311, is bought for exactly that situation on Opel vehicles.

Who It Is For

• Aftermarket distributors — stocking cooling-system lines for Opel across a regional network and needing a reference-accurate catalogue behind the shelf. What they need from 4400311 is that it fits the Opel on the ramp today.
• Workshop and fast-fit chains — replacing thermostat housing assemblys on Opel daily and judging a supplier on whether the part fits first time. They judge 4400311 on one thing: whether it matches the part that came off.
• Online parts sellers — listing by OEM reference, where a mismatched number turns into a return and a negative rating. For them 4400311 is a line on a shelf, not a project.

Problems It Solves

Parts that are no longer produced

When the original reference is dropped, the repair still exists. Sample-based production and mould development keep the line alive. With 4400311 the check is the opening temperature, the housing outline and whether the unit is map-controlled, and it happens before despatch.

Returns from wrong fitment

Every returned part costs the freight twice. Checking the opening temperature, the housing outline and whether the unit is map-controlled before despatch is cheaper than a credit note. With 4400311 the check is the opening temperature, the housing outline and whether the unit is map-controlled, and it happens before despatch.

Long lead times on slow movers

A slow line ordered alone waits for a container. Consolidated with fast movers it travels on the same shipment. That is why 4400311 carries its full cross-reference set on this page.

Technical Features

The part serves the coolant control circuit and carries the wax element, housing, seals and — on mapped units — the heater and temperature sensor that govern warm-up. Material for this reference is confirmed per enquiry. The listed opening temperature is 83°C, which is the figure that has to match the vehicle.

Matched to the circuit the part serves. Confirm the compound against the reference before ordering, because visually identical parts are moulded in different materials.

Specifications

Values marked TBC are not stated on the source catalogue. They are confirmed in writing on the quotation rather than estimated here.

Comparison With the Alternatives

Use Guide

1. Confirm the reference

   Match OEM 4400311, 4401604, 4404262, 4404841, 9108311, 9109604 and 9112262 against the number on the part you removed. Do not match on outline alone.

2. Check the interfaces

   Compare the opening temperature, the housing outline and whether the unit is map-controlled before the vehicle is stripped further.

3. Inspect on arrival

   Look for transit damage on sealing faces and connectors. Confirm the compound against the reference before ordering, because visually identical parts are moulded in different materials.

4. Fit with the original clamp style

   Reuse the clamp type the Opel platform was designed around, and fit any seal or O-ring supplied with 4400311 rather than carrying the old one over.

5. Pressure check before handover

   Refill, bleed the circuit and check for cracked plastic housings at working temperature before the vehicle leaves.