0 392 023 44Y Water Pump, Auxiliary (BOSCH OE-Spec Replacement)

The 0 392 023 44Y Water Pump, Auxiliary is a BOSCH water pump listed under our Water Pump category at CG Auto Parts Shop. Every listing includes a full manufacturer cross-reference table so you can confirm fitment by part number before you order.

How It Works

The water pump is a belt- or chain-driven centrifugal pump that circulates coolant through the engine block, cylinder head, radiator, and heater core. Its impeller forces coolant from the lower (cold) radiator outlet through the engine and out through the thermostat to the upper radiator. Flow rate at operating temperature is critical for maintaining even cylinder head temperatures.

Signs You Need a Replacement

Coolant leaking from the pump body’s weep hole signals a failing shaft seal. A grinding or whining noise from the front of the engine under load, with no play in the belt tensioner, points to worn pump bearings. Unexplained overheating with no external leak can indicate impeller blade erosion reducing flow.

Brand & Manufacturing Authority

This component is manufactured by BOSCH, a recognised supplier to the automotive aftermarket. The part number 0 392 023 44Y identifies this specific unit in the manufacturer’s own catalog. It is supplied new — not remanufactured — and is backed by our warranty policy.

Material & Construction

Built from aluminium or cast-iron housing with a pressed-steel or composite impeller; shaft bearings and seal assembly designed to the OEM service life interval. This construction is chosen to match or exceed the OE specification it replaces under the same load, temperature, and service conditions.

Fitment Confidence

Year-make-model filters alone can miss mid-year production changes that affect fitment. The safest method is to match the part number stamped on your existing unit against the cross-reference table below. If you can’t locate your existing part number, send your vehicle VIN through our contact page and we’ll confirm before you order.

Product Specifications

Cross-Reference Compatibility Table

Match your existing part number against this table before ordering. All data is drawn directly from the manufacturer’s own cross-reference documentation.

Installation & Safety Notes

Replace the coolant and thermostat at the same time on high-mileage vehicles. Torque the pump to specification and bleed the cooling system carefully before running the engine. Always follow your vehicle manufacturer’s torque specifications and service manual procedure. For the engineering standards that govern this part category, see the SAE International cooling system standards.

Quality Assurance

We verify every listing’s cross-reference data against the manufacturer’s own catalog before publishing. We sell BOSCH parts because the brand has a documented track record in the component category.

Shipping, Returns & Warranty

Orders ship from our US warehouse. Delivery windows are on our
shipping policy page. If a part arrives damaged or doesn’t fit,
the return and claim process is in our terms of service and
warranty policy. Questions?
Contact us any time.

Why Buy From CG Auto Parts Shop

• Genuine BOSCH part, cross-referenced by manufacturer part number
• New condition — never remanufactured or reconditioned
• Backed by our warranty policy
• Fast US shipping — see shipping policy for timelines
• Fitment support — contact us with your VIN before ordering
• Transparent part numbers — no guesswork, no hidden cross-brand substitutions

Related Products in This Category

Browse more of the component parts, or explore the
full shop. More parts in this category include:

• LR121418 Water Pump (SKU LR121418)
• 47-0355 Water Pump, Auxiliary (SKU 47-0355)
• 1AG5A Water Pump (SKU 1AG5A)
• PA1424 Water Pump (SKU PA1424)

Choosing the Right Water Pump — A Buyer’s Guide

Shopping for a Water Pump by part number rather than by vehicle model alone is the most reliable way to avoid a fitment mismatch. A year-make-model filter is a starting point, but the same vehicle model can use different component specifications depending on
trim level, engine variant, and production date. The cross-reference table above is built from the manufacturer’s own part-number data, which means the relationship between this part and the vehicle application is confirmed at the component level rather than inferred from model data.

When you receive the new water pump, compare it physically against the old part before installation — check overall dimensions, mounting hole positions, and connector orientation. A direct visual comparison catches any discrepancy before time is invested in disassembly. If anything doesn’t match despite the part number confirming correctly, contact us before installing, since we can usually resolve fitment questions the same day.

We source our BOSCH parts directly through authorised supply channels to ensure you receive the genuine part that the cross-reference table confirms. Aftermarket quality varies enormously by brand; listing the actual manufacturer — rather than a generic
“compatible with” label — is how we give you the information needed to make a confident buying decision. The About Us page explains our approach to sourcing and part-number verification in more detail.

After Installation — What to Check

Once the new unit is fitted and torqued to specification, a brief test drive under controlled conditions is the best way to confirm the repair is successful before returning the vehicle to normal use. Listen for any new noises from the affected area at low speed over a rough surface, and confirm that the system behaviour feels correct.

For suspension and steering components, a wheel alignment check immediately after installation is strongly recommended, since even a correctly fitted new part can require alignment correction compared to the worn part it replaced. For braking components, a proper bed-in procedure — a series of graduated stops from road speed — transfers an even layer of friction material and settles the new components before maximum braking loads are applied.

Keep the installation date and part number noted in your service records. This information is required if a warranty claim becomes necessary, and it makes future parts sourcing straightforward since you’ll have a confirmed part number on file. Our warranty policy page specifies the documentation needed to support a claim.

Frequently Asked Questions

Will this part fit my vehicle?

Match the part number on your existing component against the cross-reference table on this page. If you’re unsure, send your VIN through our contact page.

What brand is this part?

This is a BOSCH part, confirmed by matching SKU
0 392 023 44Y in the manufacturer’s cross-reference data.

Is this a new part or remanufactured?

New condition. All parts in our shop are new — no remanufactured
or reconditioned units.

How long does shipping take?

See our shipping policy for current carrier options and
delivery windows from our US warehouse.

What warranty does this part carry?

Coverage terms are detailed on our warranty policy page.

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