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- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
Air Conditioning Relay
Restore reliable operation of your Porsche air conditioning
system with this OE Match Air Conditioning Relay for Porsche 911 models from
1974 to 1988. Designed to OE specifications, this essential electrical
component controls power delivery within the air conditioning system, ensuring
the compressor, blower and associated components operate correctly when cooling
is required.
Fits:
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1988 3.2L G50
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1988 3.3L Turbo (930)
* Please check and match the part number of your relay in your car before ordering.
Although small and often overlooked, the air conditioning relay plays a critical role in the operation of the vehicle's climate control system. A faulty relay can prevent the air conditioning system from functioning correctly, leading to intermittent cooling, compressor failure to engage or complete loss of A/C operation.
Manufactured to OE Match standards, this replacement relay provides dependable performance and factory-correct fitment for maintenance, fault diagnosis and restoration projects.
What Does the Air Conditioning Relay Do?
The air conditioning relay acts as an electrically controlled switch within the A/C system.
Its primary functions include:
- Controlling power to the air conditioning system
- Activating the compressor circuit
- Supporting blower motor operation
- Protecting electrical circuits
- Managing high-current loads safely
- Ensuring reliable A/C engagement
- Supporting climate control functionality
The relay allows low-current control circuits to safely operate higher-current air conditioning components.
Why Do Air Conditioning Relays Fail?
Like all electrical relays, air conditioning relays experience wear throughout their service life.
Common causes of failure include:
- Contact wear
- Heat-related deterioration
- Electrical arcing
- Internal corrosion
- Moisture ingress
- Age-related component fatigue
- Voltage fluctuations
- Extended periods of operation
Over time, relay contacts can become worn or contaminated, resulting in unreliable operation.
Symptoms of a Faulty Air Conditioning Relay
Common warning signs include:
- Air conditioning not switching on
- Compressor failing to engage
- Intermittent cooling performance
- Blower operation faults
- Clicking noises from the relay
- Unreliable climate control operation
- Electrical system fault diagnosis issues
- Complete A/C system inactivity
Because relay failures can mimic other air conditioning faults, they are often checked early during diagnosis.
When Should the Air Conditioning Relay Be Replaced?
Replacement is recommended when:
- Diagnosing air conditioning faults
- Compressor engagement becomes intermittent
- Air conditioning stops functioning
- Electrical testing identifies relay failure
- Restoring a Porsche 911
- Performing preventative maintenance
- Refurbishing the climate control system
Many specialists replace ageing relays during electrical restoration work to improve long-term reliability.
Why Replacement Matters
Replacing a failing relay can restore proper operation of the entire air conditioning system.
Benefits include:
- Reliable compressor engagement
- Consistent cooling performance
- Improved electrical reliability
- Reduced risk of intermittent faults
- Enhanced climate control operation
- Improved driving comfort
- Better diagnostic accuracy
- Long-term system dependability
For classic Porsche 911 models, maintaining reliable electrical components helps preserve both usability and originality.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91161510302
The product you are viewing cross references to these numbers
- 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 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 GT3 MKI 1999-02
- Porsche Carrera GT 2003-06
Fits:
M606 - Cars with Daytime Driving Lights
Porsche 986 Boxster 1997-04 (M606)
Porsche 996 C2 / C4 / C4S 1998-05 (M606)
Porsche 996 Turbo 2001-05 (M606)
Porsche 996 GT3 MKI
Porsche Carrera GT 2004-06
Diagram ref no 6
* Please check and match the part number of your relay in your car before ordering.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99661511101
The product you are viewing cross references to these numbers
- 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 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 GT3 MKI 1999-02
- Porsche Carrera GT 2003-06
Fits:
Porsche 986 Boxster 1997-04 Up & Down
in sockets S3 & S9
Porsche 996 C2 / C4 / C4S 1998-05
Porsche 996 Turbo 2001-05
Porsche Carrera GT 2004-06
* Please check and match the part number of your relay in your car before ordering.
- 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 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 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 997 MK1 GT3 / GT3 RS 2007-09
- Porsche 997 MK1 GT2 2007-09
- Porsche 997 MKII Carrera C2 3.6L 2009-12
- Porsche 997 MKII Carrera C4 3.6L 2009-12
- Porsche 997 MKII Carrera C2S 3.8L 2009-12
- Porsche 997 MKII Carrera C4S 3.8L 2009-12
- Porsche 997 MKII GT3 / GT3 RS 2010-11
- Porsche 997 MKII Turbo 2010-13
- 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
- Porsche Carrera GT 2003-06
- Porsche 955 Cayenne 3.2L V6 2003-06
- Porsche 955 Cayenne S 4.5L V8 2003-06
- Porsche 955 Cayenne Turbo 4.5L 2003-06
- Porsche 955 Cayenne Turbo S 4.5L 2006>>
- Porsche 957 Cayenne 3.0L Diesel 2007-10
- Porsche 957 Cayenne 3.6L 2007-10
- Porsche 957 Cayenne S / GTS 4.8L 2007-10
- Porsche 957 Cayenne Turbo / Turbo S 4.8L 2007-10
- Porsche 958 Cayenne V6 3.6L Petrol (300Hp) 2010-17
- Porsche 958 Cayenne V6 3.0L Diesel (245Hp) 2010-17
- Porsche 958 Cayenne S V6 3.0L Hybrid (380Hp) 2010-17
- Porsche 958 Cayenne S V8 4.8L Petrol (400Hp) 2010-17
- Porsche 958 Cayenne S V8 4.2L Diesel (382Hp) 2010-17
- Porsche 958 Cayenne GTS V8 4.8L Petrol (400Hp) 2010-17
- Porsche 958 Cayenne Turbo V8 4.8L Petrol (500Hp) 2010-17
- Porsche 958 Cayenne Turbo S V8 4.8L Petrol (550Hp) 2010-17
- Porsche 970.1 Panamera S V8 4.8L 2009-13
- Porsche 970.1 Panamera 4S V8 4.8L 2009-13
- Porsche 970.1 Panamera GTS V8 4.8L 2011-13
- Porsche 970.1 Panamera Turbo V8 4.8L 2009-13
Fits:
Porsche 986 Boxster 1997-04
Porsche 987 Boxster MKI & MKII 2005>>
Porsche 987C Cayman MKI & MKII 2006>>
Porsche 993 1994-98 all models
Porsche 996 1998-04 all models
Porsche 997 MKI & MKII 2005>> all models
Porsche 970 Panamera 2010>>
Porsche Cayenne 955 & 957 2003>>
Porsche Carrera GT 2004-06
* Please check and match the part number of your fuse in your car before ordering.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99960708300
The product you are viewing cross references to these numbers