AIRTEC Power Steering Cooler Kit - BMW M3 E92

The AIRTEC Power Steering Cooler Kit is a must have when increasing the cars performance.

The Issue - during extended periods of track or even fast road use, particularly for cars with increased levels of grip, the power steering fluid’s operating temperature can climb too high to offer sufficient protection properties. As a result, the fluid breaks down, overheats and the power steering pump starts to fail. It can even cause permanent damage, if it persistently overheats.

The Solution - with huge experience in developing uprated radiators for a variety of modified track and road cars, AIRTEC chose to create a power steering cooler in the existing location but with a core that’s much taller and thicker. This means capacity is increased by an incredible 260% over standard, whilst frontal area is also increased by 109% to help cool the extra capacity.

This design increases the cooling system’s capacity as well as improving its efficiency, allowing it to retain lower running temperatures compared to an original unit during prolonged or hard use. 

Designed as a direct replacement item that uses the original connections and fittings, installation is a simple process, making it a great addition to improve cooling.

TESTED - In June 2025, AIRTEC attended a two day, back-to-back test in order to collect data as part of the track testing programme for their newly developed E9x M3 cooling package; in particular the radiator and power steering cooler. For this, AIRTEC used their AIRTEC Motorsport demonstrator vehicle, which is equipped with KW V3 suspension, AP Racing brakes, a semi-slick tyre set up, uprated exhaust system, sports cats, and a remap, among other modifications and driven by this season’s Time Attack driver Alan Shepherd. 

The first day would entail data logging with the standard cooler in place, before swapping over to their AIRTEC Motorsport cooler for the next day and repeating the same process. A temperature sensor was fitted inside the power steering reservoir to constantly monitor the system’s operating temperature.

Using the original power steering cooler on the first day of testing with an Ambient Temperature of 19°C, AIRTEC saw the fluid temperature exceed the 130-degree mark on both sessions, which is when the car’s CH 7 11S fluid starts to break down and fail, reaching an alarming peak of 144.4°C whilst struggling to recover. 

With the AIRTEC Motorsport power steering cooler upgrade fitted in place and an Ambient Temperature of 17°C, AIRTEC saw huge drops in operating temperatures, with a peak of just 72.7°C over the two sessions; a reduction of 49%. The data also showed the larger core cooler was able to recover and then maintain lower temperatures during hard use. 

This Power Steering Cooler Kit makes up part of BMW E9x M3 cooling package, which includes: 

• AIRTEC Oil Cooler Kit
  
• AIRTEC DCT Cooler
  
• AIRTEC Under Tray
  
• AIRTEC Radiator
  

Features:

• Direct replacement designed specifically for the BMW E9x M3 platform
  
• 260% increase in capacity over original BMW power steering cooler
  
• 109% increase in frontal area to help cool the extra capacity
  
• Proven to work – 49% reduction in peak operating temperature
  
• Features detailed fitting guide

Fitment:

• Replaces BMW part number: 1711752211908
• 120i – E81/E87/E88 (N43)
  
• 125i – E82 (N52)
  
• 128i – E82/E88 (N51/N52)
  
• 130i – E81 (N52)
  
• 320i – E90/E91/E92/E93 (N43)
  
• 320si – E90 (N45)
  
• 323i – E90/E91/E92/E93 (N52)
  
• 325i – E90/E91/E92/E93 (N52/N53)
  
• 325xi – E90/E91/E92 (N52/N53)
  
• 328i – E90/E91/E92/E93 (N51/N52)
  
• 328xi – E90/E91/E92 (N51/N52)
  
• 330i -E90/E91/E92/E93 (N52/N53) 
  
• 330xi – E90/E91/E92 (N52/N53)
  
• X1 25iX – E84 (N52)
  
• X1 28iX – E84 (N52)

note: check all connections at regular intervals, especially during the first few miles after installation, to inspect for leaks.