A/C Solutions BMW E28 M5 Complete Conversion Kit

New for 2025! Designed and engineered for the enthusiast, this conversion kit offers a complete, plug-and-play upgrade to the A/C system in the E28 to R134a using a modern Sanden compressor, CSF parallel flow condenser, R134a expansion valve, new R134a lines, and all the necessary supporting brackets. This upgrade will result in colder A/C vent temperatures, less strain on the engine, and a more efficient and durable A/C system.

What if my E28 didn't come factory with A/C? A/C Solutions products are designed to support factory A/C models; however, they can be fitted into non-A/C applications, but you will need to obtain a factory HVAC wiring harness, both interior lines, evaporator, aluminum engine accessory bracket (to mount our compressor bracket), and factory interior HVAC box with sensors, control module, thermostat, etc.

This product requires no R&D and is easily reversible using professionally engineered components, OEM-like hardware, and durable replacement parts resulting in a trouble-free installation that can be completed in 4-6 hours by a professional or at home without a lift. It is designed to fit both stock and euro headers while providing ample clearance around the factory oil lines and OEM brake ducting/undertray.

This kit assumes your vehicle is stock and still retains all original equipment. Proper functionality of the evaporator, wiring harness, system electronics, and HVAC sensors is/are required for a fully functional system.

What's in the box?

• Genuine Sanden SD5H14 (508) compressor
• A/C Solutions Sanden compressor bracket
• CSF parallel flow condenser w/ SPAL 13" curved blade fan and hardware (optional)
• Low-pressure suction line (bulkhead to compressor)
• High-pressure discharge line (compressor to condenser)
• High-pressure condenser return line (condenser to drier)
• High-pressure drier return line (drier to bulkhead)
• OE R134a filter drier
• R134a expansion valve
• High-pressure cut off switch
• Gates v-belt
• R134a high-pressure adapter fitting
• Compressor mounting hardware
• Model specific R134a o-ring kit
• R134a retrofit label
• Wiring kit and misc. hardware
• Detailed installation instructions

Fitment notes:

• This kit is not compatible with the 524td.
• Models fitted with fuel coolers will have to be capped and removed.
• For the 533i, BMW engine accessory bracket 64521284953 will be required to support the Sanden compressor bracket and the new lines cannot be used with the factory condenser.
• For the 528e and 533i, the late model condenser cover 51711929356 will be required to clear the CSF condenser.
• Images may not reflect all configurations of this product.

Features

• CSF parallel flow condenser
• Genuine SPAL 13" straight blade pusher fan
• Genuine Sanden SD5H14 (508) compressor
• OE R134a filter drier
• R134a expansion valve
• High-pressure cut off switch
• Gates v-belt
• R134a high-pressure adapter fitting
• Model specific R134a o-ring kit
• Includes All Mounting hardware, Full Wiring Kit, and R134a retrofit label

Applications

OEM Part Numbers

• BMW: 64531373340
• BMW: 64 53 1 373 340
• BMW: 64-53-1-373-340

Warranty

Cooling Systems and Flexibles, Inc. (CSF) warrants CSF’s High-Performance Cooling Systems, under normal use and service, to the original purchaser of the vehicle in which the product was originally installed. For more information and details please visit our Warranty Page

SKU# ACS-SC-28-M5-CSF Warranty Term: CSF does not set Warranty Policies for Private Label or Exclusive Parts. Please see the vendor's website for warranty information if not included in the description or features.