Wagner Tuning Mercedes Benz (CL)A45 AMG Radiator Kit

Wagner Tuning Radiator Upgrade Kit – Mercedes (CL)A45 AMG

If you own a Mercedes A45, CLA45, or GLA45 AMG and you’re pushing the car harder than standard – whether through tuning, track use, or simply spirited driving – keeping coolant temperatures under control becomes increasingly important. This radiator upgrade kit from Wagner Tuning is designed to do exactly that, replacing the factory front radiator and side cooler with significantly larger units that shift more heat, more efficiently.

Why Coolant Temperature Matters on the M133 Engine

The AMG A45, CLA45, and GLA45 all share the same 2.0-litre M133 turbocharged engine. This engine uses an indirect charge air cooling circuit – a system where the intake air (compressed by the turbo) is cooled using the engine’s coolant rather than directly by outside air. This means the temperature of your coolant has a direct impact on how well the intake charge is cooled, which in turn affects engine performance.

Cooler intake air is denser and burns more efficiently, so keeping coolant temperatures low is genuinely important for performance, not just reliability. Under sustained load, the standard cooling system can struggle to keep up, leading to reduced power output and the ECU pulling timing to protect the engine.

What’s in the Kit

Wagner Tuning’s kit increases the front radiator core volume by approximately 78% compared to standard, while the side cooler offers roughly 76% more volume than the OEM unit. The updated dimensions provide far greater cooling capacity without blocking airflow to surrounding components. Both coolers feature a thermally conductive anti-corrosion coating for long-term durability.

• Larger front radiator with significantly increased core volume
• Upgraded side cooler for additional heat rejection
• Thermally conductive anti-corrosion coating on both units
• Detailed fitting instructions included

Technical Specifications

Fitment

This kit fits the Mercedes-Benz A45 AMG (W176), CLA45 AMG (C117), and GLA45 AMG (X156), all running the 265-280 kW (360-381 PS) M133 engine, produced between 2013 and 2019 depending on model. Use the vehicle lookup tool on this page to confirm fitment for your specific car, or check the Vehicle Fitment tab for the full compatibility list.

Installation

Installation is straightforward for anyone with reasonable mechanical experience. Wagner Tuning includes detailed fitting instructions, and the kit is designed to be largely plug-and-play, replacing the OEM components in their original locations without the need for additional modifications.

Who This Kit Suits

This upgrade is well suited to owners who:

• Have remapped or tuned their A45, CLA45, or GLA45 AMG
• Use the car for track days or sustained high-load driving
• Live in warmer climates where standard cooling capacity is marginal
• Want to maintain consistent performance during longer, harder drives

For a standard, lightly driven car, the OEM cooling system is generally adequate. But once you start asking more