Air con evaporators & expansion valves
Fits:
Vehicles With Air-Conditioning
Porsche 928 1993-95
Porsche 964 1993-94
Porsche 968 1993-95
Porsche 993 1994-98
Diagram ref. 37.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92857331100
The product you are viewing cross references to these numbers
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
- Porsche 964 (911) TURBO 3.3L 1991-93
- Porsche 964 (911) TURBO 3.6L 1991-93
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) RS 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97
- Porsche 993 (911) TURBO 1994-96
- Porsche 993 (911) GT2 1994-97
- Porsche 993 (911) TURBO S 1994-97
- Porsche 968 3.0L 1992-94
- Porsche 968 Sport 3.0L 1994-95
- Porsche 968 CS 3.0L 1993-95
- Porsche 968 Turbo S 3.0L 1993-94
- Porsche 928GTS 5.4L 1992-95
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Restore the rear cabin air-conditioning performance on your Porsche 928 with this genuine evaporator unit (Part # 928 570 211 00). Designed for vehicles with the “Improved Efficiency” A/C option (M570) from around 1985 onwards, this direct-fit part replaces the original rear evaporator core and ensures proper cooling, airflow and de-humidification for the rear passenger compartment.
NOTE: LAST 1 IN STOCK
Fits:
- Porsche 928S2 4.7L 1984-86
- Porsche 928S4 5.0L 1987-92
- Porsche 928GT 5.0L 1989-91
- Porsche 928GTS 5.4L 1992-95
Diagram Ref No 19
What This Product Does:
- The evaporator is the component in the A/C system where the refrigerant enters the unit as a low-pressure liquid and absorbs heat from the cabin air, thereby cooling and de-humidifying the air that blows out to the cabin.
- In the rear A/C system of the 928, the evaporator is mounted within the rear HVAC housing and cools the air blowing into the rear passenger compartment.
- A properly functioning evaporator ensures the rear A/C system will deliver cold air, maintain correct charges of refrigerant, and operate efficiently.
- Since the 928’s air conditioning is sometimes used for extended periods (especially in warmer climates), the evaporator must be free of corrosion/leaks, have clean fins, and maintain proper airflow.
Symptoms Of Wear, Failure Or Need For Replacement:
- The rear A/C is not blowing cold, or takes much longer than usual to cool.
- Ice or frost formation on the evaporator core or housing — indicating restricted airflow or super-cooling.
- Leaking refrigerant: a crack or corrosion in the evaporator can cause refrigerant loss, evidenced by reduced cooling, a hissing noise, or oily residue in the HVAC box.
- Poor airflow or musty smell: a clogged, corroded or leaking evaporator may reduce airflow to the rear seats or cause musty odours from mold/moisture accumulation.
- Uneven temperature between front and rear zones (if applicable) — the rear section may lag or not reach set temperature.
- On inspection: visible corrosion, damaged fins, or signs of leaks around the evaporator housing, especially with older vehicles.
Why Replacement Matters:
- A failing evaporator not only reduces comfort (especially for rear passengers), but can lead to higher operating costs, increased wear on the compressor (due to low refrigerant charge or restricted flow), and potential damage to other components (such as blower motors, seals).
- For the 928, which is now a classic car, maintaining a fully functional A/C system helps preserve vehicle value and usability — especially if the car is driven in warmer climates or used for touring.
- Replacing the evaporator ensures the system remains efficient, prevents recurring refrigerant leaks, avoids breakdowns, and ensures correct integration with the rest of the HVAC system (expansion valves, driers, hoses).
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92857021100
The product you are viewing cross references to these numbers
- Porsche 928S2 4.7L 1984-86
- Porsche 928S4 5.0L 1987-92
- Porsche 928GT 5.0L 1989-91
- Porsche 928GTS 5.4L 1992-95
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12 Month Warranty
Worldwide Delivery
Porsche Air Conditioning Evaporators & Expansion Valves | Efficient Climate Control & Cooling Precision
The air conditioning evaporator and expansion valve work hand-in-hand to regulate your Porsche’s cabin temperature and cooling performance. The evaporator absorbs heat from the interior air, while the expansion valve controls refrigerant flow and pressure — ensuring optimal cooling efficiency and consistent climate control in all conditions.
At Design911, we supply premium-grade air conditioning evaporators and expansion valves engineered to match or surpass original performance standards. Each component is built from corrosion-resistant aluminium and precision-calibrated materials for maximum reliability, refrigerant control, and long-lasting performance.
Whether you’re restoring your Porsche’s A/C system or repairing poor cooling output, our evaporators and expansion valves guarantee dependable operation and comfort on every drive.
What Do Air Con Evaporators & Expansion Valves Do?
These two critical components form the heart of your Porsche’s A/C cooling system.
Core Functions:
- Evaporator: Cools the cabin by absorbing heat as the refrigerant evaporates.
- Expansion Valve:
Regulates the refrigerant entering the evaporator, maintaining correct
pressure and temperature.
- Ensures steady, efficient cooling in all operating conditions.
- Prevents compressor overload and system freezing.
- Maintains optimal refrigerant balance for comfort and performance.
Why Do Air Con Evaporators & Expansion Valves Fail or Degrade?
These parts operate under constant temperature and pressure fluctuations, making them vulnerable to wear, corrosion, and contamination over time.
Common Causes of Failure Include:
- Corrosion or cracking of the evaporator core.
- Blockage or sticking in the expansion valve from debris.
- Moisture contamination leading to ice build-up inside the system.
- Refrigerant leaks reducing cooling efficiency.
- Age-related deterioration of seals, fins, or fittings.
When these components fail, you may notice weak cooling, fluctuating cabin temperatures, hissing noises, or A/C system fault codes.
Why Replace Your Porsche Air Con Evaporator & Expansion Valve?
Replacing a worn or leaking evaporator and expansion valve restores the A/C system’s ability to maintain stable, efficient cooling. It also prevents costly compressor damage and protects the system from moisture and pressure-related failures.
Key Benefits:
- Restores cold, consistent cabin air flow.
- Prevents refrigerant loss and internal contamination.
- Improves system efficiency and compressor protection.
- Maintains correct refrigerant pressure and flow rate.
- Designed for Porsche 911, Cayman, Boxster, Panamera, Macan, and classic models.
- Ideal for A/C servicing, rebuilds, or performance restoration.
Regular A/C servicing and replacement of worn components ensure long-term comfort, reliability, and system protection.
Highlights
- High-efficiency Porsche A/C evaporators and expansion valves.
- Corrosion-resistant aluminium cores for long-term reliability.
- Precision-engineered for accurate refrigerant flow control.
- Direct-fit designs for Porsche road and performance models.
- Perfect for repairs, restorations, or preventative maintenance.
- Improves cooling performance and system longevity.
