Coolant Thermostat Housing Assembly for VW & Audi 03C121026AR

Product Overview

A Thermostat Housing Assembly for Audi vehicles, held against OEM 03C121026AR. 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 elements that stick part open and seals that take a set after repeated heat cycles, and the driver sees a gauge that never settles in the normal band, higher fuel consumption and thermostat fault codes. Hunan Woojin Autoparts supplies it from a cooling-system range of more than 4000 types covering German, French, Japanese, American and Korean vehicles.

Key Benefits

• Export packing as standard — The range ships to Europe, the Middle East and South America, so cartons are packed for long sea legs rather than for a local van run.
• One reference set on every document — OEM 03C121026AR appears on the quotation, the packing list and the carton label, so a warehouse can check a delivery without opening the box.
• Mixed pallets instead of single lines — A cooling-system range of more than 4000 types means a slow-moving line can travel with fast movers instead of being ordered on its own.
• Tooling route for obsolete references — Where the reference is out of production, we develop the mould from the sample you supply rather than turning the enquiry away.

Application Scenarios

Warranty-expired fleet maintenance

A fleet past dealer coverage moves to independent supply and needs the same reference coverage at a working price. For 03C121026AR the practical step is confirming the opening temperature, the housing outline and whether the unit is map-controlled before the order is placed.

Counter stock for a busy platform

Audi volume in the region justifies holding the line on the shelf instead of ordering it in per job. For 03C121026AR the practical step is confirming the opening temperature, the housing outline and whether the unit is map-controlled before the order is placed.

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. With 03C121026AR on the list the rest of the coolant control circuit can be priced at the same time.

Who It Is For

• Fleet and bus operators — running Audi vehicles past warranty and buying cooling-system parts by the box to keep downtime short. For them 03C121026AR is a line on a shelf, not a project.
• Radiator and cooling specialists — rebuilding cooling systems and sourcing the hoses, flanges and housings for a platform in one go. 03C121026AR earns its shelf space through repeat demand on Audi platforms.
• Exporters and consolidators — shipping mixed cooling-system pallets into Europe, the Middle East and South America. They order 03C121026AR by the carton and reorder against the same number.

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. For this thermostat housing assembly the answer is the reference, 03C121026AR, on every document.

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. That is why 03C121026AR carries its full cross-reference set on this page.

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 03C121026AR 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 87°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 03C121026AR 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 Audi platform was designed around, and fit any seal or O-ring supplied with 03C121026AR 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.