CSF AUXILIARY RADIATORS Mercedes CLA C117 Coupe 2013 -> CLA 45 AMG (360 Hp)

Keep your charge temperatures or coolant temperatures consistently cooler with CSF's High-Performance All-Aluminium Auxiliary Radiators for Mercedes-AMG E63 AMG and more! 

This multi-fit CSF auxiliary radiator replaces the small auxiliary radiator with an upgraded unit. This upgraded unit has a significantly improved design, specifically designed to keep charge or coolant temperatures consistently cooler. 

Note: This unit fits many different Mercedes-AMG vehicles. On some vehicles, this radiator is used as a charge cooler coolant radiator and in others an engine coolant radiator. 

The Problem

For vehicles that use it as a Heat Exchanger (charge cooler water radiator) 

As you probably already know, as the turbocharger compresses air this heats it up. This hot air is bad for the engine as it will reduce the knock threshold and limit the safe power output of the engine, killing fun. Aftermarket ECU software increases boost pressure, this means that the air will be compressed more and thus, heat up more. 

The factory auxiliary radiator is designed for standard power levels and expected type of use, as soon as you go outside of the factory power levels and expected type of use, your factory auxiliary radiator will begin to struggle. As well as this, as your radiator goes through its life the core will deteriorate externally as well as fill with contaminates internally to reduce its cooling power.

For vehicles that use it as a Water Radiator (engine coolant) 

CSF’s high-performance all-aluminium water radiators help to keep coolant temperatures consistently lower than the factory radiator. This is because your factory radiator was designed for standard power levels and expected type of use, as soon as you go outside of the factory power levels and expected type of use, your factory radiator will begin to struggle. As well as this, as your radiator goes through its life the core will deteriorate externally as well as fill with contaminates internally to reduce its cooling power.

The Solution

The CSF auxiliary radiator for the Mercedes-AMG E63 and more is a larger, more efficient auxiliary radiator for significantly improved cooling power. CSF’s cores are unique in that it uses our B-tube design for the radiator tubes. 

The B-Tube core is comparatively stronger than the O-Tube which allows the tube to be made using less material, improving heat transfer and being much lighter than an O-Tube radiator of the identical sizing. This, combined with the dual laminar flow and improved surface area inside the core allow for an efficiency improvement of around 10-20% vs. an O-Tube core auxiliary radiator of the same size. Whilst more expensive to manufacture, for performance use, it is the perfect auxiliary radiator tube design! Alongside this our high-efficiency multi-louvred fins are optimised for each application. 

With the increased cooling power charge temperatures or engine water temperatures are kept consistently cooler, restoring power lost through hot charge air temps or preventing overheating. This means you will enjoy more power, more of the time, in more conditions! 

How the CSF design does it 

In the chart below you can see the OEM core (original) design vs. the CSF core design. The CSF core is deeper, has more cooling tubes and a much larger flow area. This results in a huge increase in cooling performance. 

• 2-row 68mm B-tube core vs. OE 1-row 42mm core 
• Ultra-efficient 6.5mm tall multi-louvred fins

CSF MANUFACTURING, TESTING & FINISH

All of our auxiliary radiators are manufactured in our own factories, this means we have total control over our production, unlike other white-label brands. Our auxiliary radiators start life in our factory as an aluminium sheet and from there we create our own B-tubes, multi-louvred fins and end-tanks as well as CNC machine all of our fittings. The core is then CAB brazed and the end-tanks and fittings TIG welded together by our master welders. 

All of our auxiliary radiators are individually leak tested and go through a 30 point fitment inspection to ensure critical dimensions are per our design. 

To finish our auxiliary radiators our signature 1-hour ‘show-stopper’ finish is applied, however, this has currently been suspended during the pandemic in favour of our high-lustre satin finish. 

Fitment List

This CSF High-Performance All-Aluminum Auxiliary Radiator is a replacement for OEM part number 099-500-32-03 which at the time of writing was fitted to the following vehicles: 

Product Notes: 

1. Sold individually. Some models may require 1 and some models may require 2 or more for a full set. 
2. Depending on the model, this may be an auxiliary engine water radiator or charge cooler water radiator.