Air conditioning cleaning for classic cars: Clean cabin air for the Porsche 928

In the Porsche 928 – a technically exceptional grand tourer of its time – the air-conditioning system has one key peculiarity: it was designed without a pollen filter. As a result, the incoming air flows unfiltered directly onto the evaporator, where dust, moisture and dirt can accumulate over the years. This often leads to unpleasant odors, reduced cooling performance and, in some cases, even allergic reactions.

This design follows a concept from the 1970s and 1980s: engineered with careful thought, logically structured, and surprisingly easy to access – but without today’s usual filtration standards. Our application engineer aptly describes the system as “exciting, sensible, and easily accessible.” It’s precisely this combination that makes cleaning necessary, yet at the same time particularly effective.

How relevant this is can be seen in the example of a 928 GT owner: after switching off the air conditioning, there were regularly strong odors, and his wife became increasingly sensitive to them. At the latest on longer journeys it becomes clear how crucial good air quality in the interior is – and how important professional evaporator cleaning becomes.

This makes the special design of the 928 a defining feature of this classic – and a key reason why a thorough and professional cleaning of the evaporator with airco well® is not only sensible, but essential. The good accessibility of the system is a clear advantage here, provided that the appropriate cleaning method is used.

Why airco well® – and how the cleaning process works on the Porsche 928

Especially with a classic like the Porsche 928, gentle and material‑friendly cleaning of the air conditioning system is crucial. The components of the ventilation systems are more sensitive than in modern vehicles – and this is exactly where airco well® comes in. The active ingredient is completely gentle on materials, leaves no aggressive residues, and reliably coats even hard‑to‑reach areas.

During cleaning, the entire air conditioning system – including the evaporator and all air ducts – is treated evenly. This not only removes surface dirt, but also effectively dissolves deeply embedded deposits. The method works without harsh chemicals, protects the system in the long term, and is therefore ideal for sensitive classic cars.

The owner – Richard – was on site throughout the entire treatment. He had his 928 converted to an environmentally friendly refrigerant 15 years ago, but the odors remained a persistent issue. That’s why he wanted a sustainable solution here.

When the airco well® experts started the cleaning, he was surprised at how simple and gentle the process was on the materials. He later told us:

“I was pleasantly surprised at how quickly and effortlessly this procedure could be applied to my classic car. And after the treatment with airco well®, I’m absolutely thrilled with the outstanding air quality in the cabin on every drive.”The Porsche 928 impressively demonstrates that high‑quality engineering can still convince even after decades – provided it is properly maintained. The air conditioning system of this classic in particular deserves special attention, as its design-related sensitivity makes thorough and gentle cleaning indispensable. Treatment with airco well® not only ensures noticeably better air, but also actively contributes to preserving the vehicle’s value over the long term.

Conclusion: better preservation, better air, better driving experience

The result: a noticeably more pleasant interior climate, greater well-being for driver and passengers, and a classic that excites both inside and out.This ensures that every drive in the Porsche 928 remains a true experience – clean, fresh, and optimally protected from a technical standpoint.