ERR5099 - Bypass Hose

- €3,00

€3,00

€3,00 - €3,00

€3,00

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Aftermarket: Quality alternative. This is a quality alternative, designed to fit and function like the original part, often at a more competitive price.

Bypass Hose forming part of the engine cooling circuit on the 2.5L 300TDi turbo diesel engine.

It carries coolant through the bypass route at the water pump, allowing circulation while the thermostat is closed so the engine warms evenly before the main radiator circuit opens.

Vehicle Model Land Rover Defender up to 2016
Land Rover Discovery 1 1989-1998 (L318)
Range Rover Classic up to 1994

Fitment Notes DEFENDER 1987-2006 — 2.5L 300 TDi, bypass hose to coolant pump
DISCOVERY 1 1989-1998 — 2.5L 300 Tdi (From FA393361 to WA799999)
RANGE ROVER CLASSIC 1992-1994 — 2.5L TDi (From JA610294)

Alternative Codes

ERR5099

In stock 42 units

35 · Gouda 7 · Drachten

Express delivery available

When will my order arrive?

Order before 15:00 (Mon–Fri): same-day dispatch for in-stock items.
UPS Express (order before 14:00): dispatched today, delivered tomorrow where available.
Netherlands / Belgium / Germany: 2–4 working days.
Other EU countries + UK: 4–8 working days.
Outside EU/UK: delivery times vary — contact us for an estimate.

Items may ship from multiple warehouses at no extra cost.

Job kits containing this part

This part is included in 0 job kit(s) below. Pick the kit that matches your vehicle and job, then add what you need.

Frequently asked questions

What is the ERR5099 bypass hose for?

The ERR5099 bypass hose carries coolant through the bypass route at the water pump on the 2.5L 300TDi engine. It lets coolant circulate while the thermostat is closed, so the engine warms evenly before the main radiator circuit opens.

Does the bypass hose need any clamps to fit?

The bypass hose is secured with two hose clamps in the 16-27mm range, as noted in the fitment data. Check your existing clamps are sound when fitting the ERR5099 on a 300TDi, as a weak clamp on the bypass route typically causes a coolant weep at the water pump.

Why does the bypass hose need replacing?

Bypass hoses typically harden, perish or split with age and heat on the 300TDi, which can cause a coolant leak at the water pump and overheating. Replacing a cracked bypass hose restores proper warm-up circulation on a Defender, Discovery 1 or Range Rover Classic.