REDOX 15-Piece Silicone Coolant Hose Kit for Audi S3 8L 1.8T 225hp (1996-2003)

High-Performance Silicone Hose Kit for Audi S3 8L

This complete 15-piece REDOX silicone hose kit has been specifically engineered to replace the entire engine cooling system of your Audi S3 8L equipped with the 1.8T 20-valve 225 horsepower engine. Designed for direct bolt-on installation without modifications, this kit transforms the thermal reliability of your compact quattro sports car.

Advanced Technical Specifications

Each hose in this kit is manufactured from premium-grade VMQ silicone with a 3-ply construction guaranteeing a consistent 4mm wall thickness. This multi-layer architecture provides exceptional resistance to the high pressures generated by the K04 turbocharger equipping the S3. The operating temperature range extends from -50°C to +180°C, far exceeding the thermal constraints of the 1.8T engine even during intensive track use.

The VMQ silicone selected by REDOX exhibits superior elasticity compared to original rubber while maintaining its shape under pressure. Unlike rubber hoses that expand and crack over time, silicone maintains its structural integrity even after thousands of thermal cycles. This dimensional stability guarantees perfect cooling system sealing over the long term.

Vehicle Applications and Compatibility

This kit fits perfectly on first-generation Audi S3 models (8L chassis) produced between 1996 and 2003, equipped with the turbocharged 1.8-liter 4-cylinder 20-valve engine developing 225 horsepower (engine codes APY, AMK, AUL, BAM). These powertrains share the same cooling architecture, making this kit universal for the entire S3 8L production run.

The S3 8L, built on the PQ34 platform it shares with the Audi TT Quattro and Golf IV, uses a pressurized cooling system with expansion tank. The circuit includes main radiator hoses, cabin heater hoses, oil cooler lines, and connections to the auxiliary water pump. This 15-piece kit covers all these flexible connections.

OEM Part Number Replacement

This REDOX kit advantageously replaces original Audi hoses whose main references are 8L9121101A (upper radiator hose), 8N0121051B (lower radiator hose), 8L9121053A (auxiliary pump hose), 8L9121073D and 8L9121157D (heater hoses), 8N0121088 (oil cooler hose), 8L9121096C (other radiator hoses), and 8L9121086D (radiator bleed hose specific to engine codes APY/AMK/AUL).

Original EPDM rubber hoses age poorly under the high temperatures of the 1.8T turbo. After 15-20 years, they become porous and brittle, causing seepage then sudden ruptures. Preventive replacement with this silicone kit permanently eliminates this failure risk.

Permanent Stock and Express Shipping

REDOX maintains permanent stock of this kit in its French warehouse located in the Paris region. Any order placed before 5 PM is shipped the same day via GLS carrier with no-signature delivery. Delivery occurs within 24 to 48 business hours throughout metropolitan France and Europe.

This immediate availability represents a decisive advantage for tuners, competition workshops, and enthusiasts wishing to minimize vehicle downtime. No more waiting weeks for original parts often out of stock at Audi dealers.

Main Technical Characteristics

Material: High-resistance VMQ silicone Construction: 3-ply woven reinforced Wall thickness: 4mm constant Temperature: -50°C to +180°C continuous Pressure: Resistance exceeding 3 bar Contents: 15 form-specific hoses Clamps: Aviation-grade stainless steel clamps included Colors: Blue, Black, or Red to choose Circuit: Complete engine cooling Warranty: Lifetime with no mileage limitation

The kit includes aviation-type stainless steel clamps guaranteeing uniform tightening without hose deformation. These wide-band clamps distribute pressure and prevent leaks better than original screw clamps.

Lifetime REDOX Warranty

REDOX guarantees all its silicone hoses for life against any manufacturing or material defect. This warranty with no mileage or time limitation demonstrates absolute confidence in the quality of selected materials and manufacturing process. In case of proven failure, REDOX performs immediate replacement at no charge.

This warranty covers only defects intrinsic to the product and does not apply to damage caused by incorrect installation, over-tightening of clamps, coolant contamination, or external mechanical impact.

Frequently Asked Questions

Does installing this kit require modifications to my S3 8L? No, this kit is designed for direct installation in place of original hoses. Each hose exactly reproduces the bends and diameters of Audi parts. No cutting or adaptation required. Complete installation can be performed in half a day by an experienced mechanic.

What's the difference between silicone and original rubber? VMQ silicone offers superior heat resistance (180°C continuous versus 120°C for rubber), doesn't harden over time, doesn't crack from ozone exposure, and maintains its elasticity after thousands of thermal cycles. Original EPDM rubber becomes porous after 10-15 years and requires regular replacement.

Is this kit suitable for track use? Absolutely. REDOX hoses are specifically developed for motorsport applications and equip numerous competition cars in drift, rally, and circuit racing. The resistance to 180°C and 3-ply construction handle thermal constraints of extended timed sessions without issue.

Can I reuse my original clamps? We strongly recommend using the stainless steel clamps supplied in the kit. Original simple screw clamps can mark the silicone and create weak points. The included wide-band aviation clamps distribute pressure better and guarantee optimal sealing.

Does color choice affect performance? No, the three colors offered (Blue, Black, Red) use exactly the same VMQ silicone base and offer identical performance. The choice is purely aesthetic according to your visual preferences for engine bay presentation.

Is this kit compatible with standard coolant? Yes, VMQ silicone is compatible with all coolant types: classic ethylene glycol antifreeze, OAT long-life coolant, bio propylene glycol antifreeze, and even pure water for competition use. However, we recommend following Audi specifications regarding coolant.

How long does complete kit installation take? An experienced mechanic needs approximately 3 to 4 hours to replace all 15 hoses. The operation requires complete drainage of the cooling system, methodical removal of original hoses, and installation of new parts with supplied clamps. Also plan time for system bleeding and leak verification.

Are REDOX hoses resistant to hydrocarbons? Standard VMQ silicone exhibits moderate resistance to oils and fuels. In normal cooling circuit use, there's no contact with hydrocarbons. However, immediately clean any engine oil or fuel splashes on hoses during mechanical work.