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Porsche // 924 (1977-1988) // 924 Turbo 2.0L 1979-81
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- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche Boxster 987 2.7L 2005-08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche Boxster 987 MKII 2.9L 2009-12
- Porsche Boxster S 987 MKII 3.4L 2009-12
- Porsche 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 996 TURBO 2000-05
- Porsche 996 GT2 2001-05
- Porsche 996 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003-04
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
- Porsche 997 MK1 TURBO 2007-09
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
- Porsche Cayman 2.9L 987C MKII 2009-12
- Porsche Cayman S / R 3.4L 987C MKII 2009-12
Right-Hand Drive Vehicles with Air Conditioning (option code: 573)
This part is not sold separately by Porsche and normally requires replacement of the entire A/C housing.
Note: Please check the orientation of the high and low-pressure pipes at the connector and compare them with those fitted to your vehicle before ordering. Alternative pipe orientation is available with part number 99657390101/1.
Fits:
Porsche 986 Boxster 1997-04
Porsche 996 Carrera 1998-04
Porsche 996 Turbo 2001-05
Porsche 996 GT3 1999-05
Porsche 987 Boxster 2005-2008
Porsche 987 Boxster 2009-2012
Porsche 987C Cayman 2006-2008
Porsche 987C Cayman 2009-2012
Porsche 997 Carrera 2005-2008
Porsche 997 Turbo 2007-2009
Diagram ref. 1.
The premium-quality air distribution housing with evaporator core (HVAC component) designed for Porsche vehicles. This unit is part of the heating, ventilation & air-conditioning (HVAC) system that directs cooled air from the evaporator into the cabin and supports climate control performance.
The air distribution housing with evaporator receives refrigerant-cooled air from the A/C system and routes this conditioned air into the vehicle cabin. The integrated evaporator cools and dehumidifies incoming airflow before it travels through ducts and vents. This ensures efficient cooling performance and contributes directly to occupant comfort, especially in warmer conditions.
• Application: Center-mounted air distribution and evaporator housing unit in the HVAC system (right-hand drive cars in many listings). It replaces the original Porsche part 99657390101 and is designed to fit directly into the factory climate control assembly.
• Function: In operation, the evaporator core inside the MAHLE housing absorbs heat from the incoming cabin air as refrigerant circulates through it. The housing channels this cooled air through the HVAC blower and into the passenger compartment at controlled rates. A quality housing ensures proper fitment, stable mounting of the evaporator core, and reliable airflow distribution - all critical to effective climate control.
An air distribution housing and evaporator assembly that is worn, clogged, cracked, or inefficient can result in:
• Reduced cooling performance or inability to reach target cabin temperatures.
• Moisture buildup or odours as the evaporator becomes less effective.
• Higher HVAC system strain, leading to increased wear on blower motor or compressor.
Replacing this component with a MAHLE-quality HVAC housing restores airflow integrity and cooling efficiency, helping maintain occupant comfort and system reliability.
Consider replacing if you notice:
• Weak or inconsistent A/C airflow
• Unusual noises from the HVAC box
• Reduced cooling or warm air output
• Refrigerant or moisture leaks around the housing
• During major climate control servicing
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99657390101
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