Klima Design Works | Parallel Flow Condenser Upgrade Kit W123
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Parallel Flow Condenser Upgrade Kit W123


An R-134a A/C Performance Improvement Kit for W123 Mercedes 1977-1985 (240D, 300D, 300CD, 300TD & others)


Do you need colder air conditioning in your Mercedes W123, but don’t want to use expensive, ozone-depleting R-12? The answer is to replace your antiquated condenser with a modern one, designed specifically for R-134a: A Parallel-Flow Condenser. This condenser type is used on all modern vehicles which use R-134a.┬áKit is made to order; allow 7 days processing time.


Shipping within the continental US is $20-$25 via UPS Ground. Fees added at checkout. International rates vary.



SKU: KCNKW123 Category:


Standard Kit Includes:

  • A high quality 4-Pass parallel-flow style condenser (16″ x 20″)
  • Illustrated installation instructions
  • W123-specific mounting brackets in 16 gauge stainless steel
  • Complete condenser hardware kit, including stainless condenser rail screws, and stainless strain relief clamp
  • Custom liquid lines which connect directly with stock system lines
  • HNBR O-Rings for all associated connections


What are the benefits of using a Parallel-Flow Condenser?

The four-pass parallel-flow condenser included with our kit is approximately 30% more efficient than the original tube-and-fin style condenser. Parallel flow condensers are used on the majority of new vehicles, and have a radically different internal design which makes them highly effective at condensing the small molecules of R-134a. The OEM tube-and-fin condenser has great difficulty dealing with R-134a, as it lacks the specific internal structure needed to properly condense this gas. To get better cooling in your W123, you need the higher-efficiency, refrigerant-specific design of a parallel-flow condenser.


How Difficult is it to Install this Kit?

We created this kit to help other W123 owners upgrade to a parallel-flow condenser without having to go through the hassle of attempting to source, design, and fabricate all of the individual components required to convert. Our kit requires no special tools to install, and does not involve any cutting drilling that would damage your beautiful original vehicle.


This product is a non-OEM system modification which has not been evaluated or approved by the vehicle manufacturer. Product is installed at your own risk. Legal Disclaimer: This product is intended for off-road use only.


Please note that this kit is not compatible with all W123 models. Please determine if your vehicle is supported: Compatibility

Select Options

W123 Standard 16×20 PF Upgrade, W123 Extra Large 16×24 PF Upgrade (2 week lead time / made to order)