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- Porsche 928 4.5L 1978-82
- Porsche 928S 4.7L 1981-83
- Porsche 928S2 4.7L 1984-86
Relay location/code no.: XVII
Fits:
Porsche 928 1978-86
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92861511303
The product you are viewing cross references to these numbers
- 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 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)
The red fuel pump relay is an replacement designed to control and protect the fuel pump circuit on classic Porsche 911 models from 1975–89. Built to the same electrical specifications as the original red relay (previously 91161510801), it ensures reliable activation of the fuel pump, stabilises current delivery, and prevents pump operation under unsafe conditions.
Fits:
Porsche 911 1975 - 1989
Porsche 911 Turbo 3.0/3.3L 1975 - 1989
* Please check and match the part number of your relay in your car before ordering.
This red fuel pump relay:
• Controls power supply to the fuel pump, ensuring it only runs when the engine is operating or cranking
• Provides essential electrical protection by preventing voltage spikes and reducing load on ignition components
• Ensures stable fuel delivery for smooth starting, reliable idle and consistent engine operation
• Replaces weak, intermittent or failed original relays that can cause no-start symptoms, stalling or fuel-pressure loss.
A failing red fuel pump relay can cause:
• Intermittent or complete no-start conditions
• Engine stalling, especially when warm Loss of fuel pressure leading to hesitation or uneven running
• Electrical overheating or relay chatter Fuel pump running continuously - a significant safety risk
Replacing the relay restores reliable fuel delivery and ensures the fuel pump operates exactly as Porsche intended.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91161510802
The product you are viewing cross references to these numbers
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
Fits:
Porsche 911 1984-89 3.2L (6 Pin connector)
Previous number:
- 91161815400
- 91161815401
* 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.
91161815402
The product you are viewing cross references to these numbers