Forge Motorsport PolarCooler FMHE/LTR Heat Exchanger Chargecooler Radiator for BMW B58/B48 F-Series (F20 F21 F22 F23 F30 F31 F32 F33 F36) - Direct-Fit Triple Pass Intercooler Water Radiator Upgrade for M140i M240i 340i 440i 120i 125i 220i 230i 320i 330i

High-Performance Low-Temperature Heat Exchanger for BMW F-Series B48 and B58

Unlock dependable power on road and track with this uprated low-temp radiator for the water-to-air intercooler circuit. Built by Forge Motorsport and known as the PolarCooler, this front mount heat exchanger is the proven cooling solution for BMW F-series four and six cylinder turbo models. If you run a tuned or stock M140i, M240i, 340i, 440i, 120i, 125i, 220i, 230i, 320i or 330i, this drop-in upgrade keeps intake charge temperatures under control and helps eliminate heat soak for repeatable performance.

Why this heat exchanger belongs on your B48 or B58

Hard driving and ECU calibration quickly expose the limits of the factory auxiliary radiator in the charge air cooling loop. Elevated IATs lead to timing pull and reduced power. This unit uses a high efficiency, louvred-fin core and a triple pass flow path to maximise thermal transfer, stabilise temps and keep your turbocharged BMW delivering consistent gains pull after pull.

Standout benefits

• Massive capacity increase with a high density 18 fpi louvred-fin core for exceptional heat rejection
• True plug-in replacement that occupies the OEM location and integrates with the existing chargecooling circuit
• Triple pass coolant routing to utilise the full face of the core for superior cooling efficiency
• Proven intake temp reduction of 20°C across three consecutive dyno runs
• Significantly larger fluid volume, approximately 17 litres versus the factory 7.71 litres, extending resistance to heat soak
• Handcrafted alloy end tanks with a durable black powder coated finish for corrosion resistance
• Designed and manufactured in Great Britain and covered by Forge’s lifetime warranty

Real results you can feel

We have installed and used this cooler on our own builds and many customer vehicles. The improvement in intake temperatures and on-road consistency is exactly what enthusiasts expect from a serious cooling package. Feedback from M140i, M240i, 340i and 440i owners has been excellent, especially on cars running performance software where the stock heat exchanger struggles.

Vehicle compatibility

• BMW 1 Series F20 and F21 LCI from 09/2015 onward: 120i, 125i, M140i
• BMW 2 Series F22 and F23 LCI from 09/2016 onward: 220i, 230i, M240i
• BMW 3 Series F30, F31, F34, F35 LCI from 09/2014 onward: 320i, 330i, 340i
• BMW 4 Series F32, F33, F36 LCI from 05/2016 onward: 420i, 430i, 440i

Dimensions

OEM unit: 576 mm x 495 mm x 27 mm

PolarCooler: 530 mm x 471 mm x 68 mm

Installation

Typical fitting time is around 4 hours. It uses factory mounting points and interfaces with the original plumbing for a clean, hassle-free install.

Want it fitted by professionals in the UK We can install at MJ Modifications in Warwickshire. Request a quote at info@mjmodifications.co.uk.

What you gain

• Lower intake air temperatures for B48 and B58 engines
• Far better resistance to heat soak for consistent performance on spirited drives, track days and fast road use
• Greater reliability and efficiency on tuned and standard vehicles
• A robust UK-made cooling upgrade backed by a lifetime warranty

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