Coolant Thermostat Housing Assembly for BMW 17217599546

Product Overview

This Thermostat Housing Assembly is supplied for BMW applications and is catalogued against OEM 17217599546, 17217638681, 17227572541 and 17218624132. Matching starts from the reference rather than from a picture, which is what keeps a container of parts out of the returns pile. Because the part carries the wax element, housing, seals and — on mapped units — the heater and temperature sensor that govern warm-up, a worn one rarely fails cleanly — expect leaking sensor bosses and elements that stick part open long before it separates, with a gauge that never settles in the normal band, higher fuel consumption and thermostat fault codes as the first complaint over the counter. It sits inside a cooling-system programme of more than 4000 types, so the same order can carry the neighbouring hoses, flanges and thermostat housings for the platform.

Key Benefits

• 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.
• Checked on the features that matter — Inspection concentrates on the opening temperature, the housing outline and whether the unit is map-controlled — the dimensions that put a part back in the box if they are wrong.
• Matched to how the part actually fails — Leaking sensor bosses and elements that stick part open 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.

Application Scenarios

Scheduled cooling-system overhaul

The vehicle is in for a coolant leak and the workshop replaces the whole branch at once rather than chasing the next failure in a month. With 17217599546 on the list the rest of the coolant control circuit can be priced at the same time.

Warranty-expired fleet maintenance

A fleet past dealer coverage moves to independent supply and needs the same reference coverage at a working price. With 17217599546 on the list the rest of the coolant control circuit can be priced at the same time.

Counter stock for a busy platform

BMW volume in the region justifies holding the line on the shelf instead of ordering it in per job. Here the thermostat housing assembly is ordered against 17217599546 and travels with the rest of the BMW branch.

Who It Is For

• Workshop and fast-fit chains — replacing thermostat housing assemblys on BMW daily and judging a supplier on whether the part fits first time. They order 17217599546 by the carton and reorder against the same number.
• Online parts sellers — listing by OEM reference, where a mismatched number turns into a return and a negative rating. For them 17217599546 is a line on a shelf, not a project.
• Fleet and bus operators — running BMW vehicles past warranty and buying cooling-system parts by the box to keep downtime short. What they need from 17217599546 is that it fits the BMW on the ramp today.

Problems It Solves

Reference mismatch

Visually identical parts carry different connector geometry between model years. Quoting OEM 17217599546, 17217638681, 17227572541 and 17218624132 fixes the identity before money moves. For this thermostat housing assembly the answer is the reference, 17217599546, on every document.

Split ordering

Sourcing one hose from one supplier and the matching flange from another doubles the freight and the paperwork for the same repair. That is why 17217599546 carries its full cross-reference set on this page.

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. On 17217599546 that is settled before the quotation goes out.

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 82°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 17217599546, 17217638681, 17227572541 and 17218624132 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 BMW platform was designed around, and fit any seal or O-ring supplied with 17217599546 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.