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Relays / Sensors / Resistors

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DISPLAYING 1 to 7 (of 7 products)
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99965701890
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Air conditioner relay.

Fits:
For cars with air conditioner (M:573)
Porsche 968 1992 - 1995
Porsche 964 1989 - 1994
Porsche 993 1995 - 1998
Porsche 996 1998 - 2005
Porsche 997.1 2005 - 2008
Porsche 986 Boxster 1997 - 2004
Porsche 987.1 Boxster 2005 - 2008
Porsche 987C.1 Cayman 2006 - 2008

* Please check and match the part number of your relay in your car before ordering.

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99965701890
96461521500
99965701890

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99657346600
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Product Information
Air Conditioning High Pressure Line (Large) Valve - High Side.

porsche

Fits:
Porsche 986 Boxster / S 1997-04
Porsche 987 Boxster / S 2005-08
Porsche 987 Boxster / S 2009-12
Porsche 987C Cayman / S 2005-08
Porsche 987C Cayman / S 2009-12
Porsche 996 1998-05 All models
Porsche 997.2 Carrera / Turbo 2009-13
Porsche Carrera GT 2004-06

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Diagram ref no 27

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99657346600
99657346600

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99657346500
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Product Information
Air Conditioning Pressure Line (Small) Valve - Low Side. 

porsche

Fits:
Porsche 986 Boxster / S 1997-04
Porsche 987 Boxster / S 2005-08
Porsche 987 Boxster / S 2009-12
Porsche 987C Cayman / S 2005-08
Porsche 987C Cayman / S 2009-12
Porsche 996 1998-05 All models
Porsche 997.2 Carrera / Turbo 2009-13
Porsche Carrera GT 2004-06

Click 'Zoom in' for large parts diagram.
Diagram ref no 29

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99657346500
99657346500

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99665324100
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Cabin temperature sensor. 

porsche

Fits:
Porsche 986 Boxster 1997-04
Porsche 996 C2 / C4 / C4S 1998-05
Porsche 996 Turbo / GT3

Click 'Zoom in' for large parts diagram.
Diagram ref no 17

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99665324100
99665324100

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1H0907543A
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Climate Control Temperature Sensor.

Fits:
Porsche 986 Boxster 1997>>2004
Porsche 987 Boxster MKI / MKII 2005>>2012
Porsche 987C Cayman MKI / MKII 2006>>2012
Porsche 996 C2 / C4 / C4S 1998>>2005
Porsche 996 Turbo / GT2 / GT3 1999>>2005
Porsche 997 MKI / MKII C2 / C4 / C2S / C4S 2005>>2012
Porsche 997 Turbo / GT2 / GT3 2007>>2013

This Sensor Sends The Temperature Readings To The Climatronic Unit To Keep Your Heating And A/C Systems Operating Properly. If The Sensor Gives Incorrect Readings, The Climatronic System May Not Function Properly And The Air Temperature That Is Blown Out Through The Vents May Not Correlate With The Current Setting. Keep Your Climatronic System Working Correctly With A New Temperature Switch.

This Switch Is Located On The Lower Center Position Of The Evaporator Housing And Relays The Temperature Of The Air After The Heater Core/Evaporator.

Diagram Ref No 15

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1H0907543A
1H0907543A

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95850553500
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Product Information
Outer temp sensor in front bumper.

porsche

Fits:
Porsche Boxster 986
Porsche 996
Porsche 958 Cayenne MKIII 2011>>
Porsche Panamera MKI & MKII
Porsche 981 Boxster 2013>>
Porsche 981C Cayman 2013>>
Porsche 991 C2 / C2S 2012>>
Porsche 997 GT2 RS 2010-12
Porsche 997 GT3 2007-11
Porsche Carrera GT 2004-06

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95850553500
95850553500
99664114200

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95850553500/1
Product Information
Product Information
Outer temp sensor in front bumper.

Fits:
Porsche Boxster 986
Porsche 996
Porsche 958 Cayenne MKIII 2011>>
Porsche Panamera MKI & MKII
Porsche 981 Boxster 2013>>
Porsche 981C Cayman 2013>>
Porsche 991 C2 / C2S 2012>>
Porsche 997 GT2 RS 2010-12
Porsche 997 GT3 2007-11
Porsche Carrera GT 2004-06

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95850553500
95850553500
99664114200

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DISPLAYING 1 to 7 (of 7 products)
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About Relays / Sensors / Resistors

Porsche HVAC Relays, Sensors & Resistors | Precision Climate Control & System Reliability

Relays, sensors, and resistors are vital components in your Porsche’s heating and air conditioning system. They ensure the correct operation of fans, blowers, and temperature control systems by managing electrical flow, monitoring environmental conditions, and regulating motor speeds. A properly functioning electrical control system ensures reliable, efficient, and responsive climate control performance.

At Design911, we supply premium relays, sensors, and resistors engineered to meet or exceed original performance specifications. Built with high-quality materials and advanced circuitry, these components provide dependable electrical performance and long service life, ensuring your Porsche’s HVAC system operates as smoothly as intended.

Whether you’re diagnosing inconsistent airflow, fan speed issues, or erratic temperature readings, our range of Porsche HVAC relays, sensors, and resistors delivers precise performance, compatibility, and durability.

What Do HVAC Relays, Sensors & Resistors Do?

These components work together to regulate the electrical and mechanical functions of the climate control system.

Core Functions:

  • Relays: Control power to components like blower motors and compressors.
  • Sensors: Monitor temperature, pressure, and humidity for automatic climate adjustment.
  • Resistors: Regulate fan speeds and motor operation.
  • Maintain efficient, stable heating and cooling performance.
  • Protect sensitive electrical components from overloads.

Without functioning relays, sensors, or resistors, the HVAC system may deliver erratic airflow, inaccurate temperatures, or fail to operate entirely.

Why Do HVAC Relays, Sensors & Resistors Fail or Malfunction?

Electrical components endure constant voltage changes, heat cycles, and vibration — all of which can lead to degradation over time.

Common Causes of Failure Include:

  • Corrosion or oxidation on terminals and connectors.
  • Overheating or short circuits caused by electrical surges.
  • Moisture ingress or condensation.
  • Burnt-out resistors due to high current load.
  • Age-related sensor drift or internal failure.

When these components fail, you may notice intermittent fan operation, incorrect cabin temperature readings, or total loss of heating and cooling functionality.

Why Replace Your Porsche HVAC Relays, Sensors & Resistors?

Replacing worn or faulty electrical components restores climate control accuracy and ensures your HVAC system functions efficiently and safely.

Key Benefits:

  • Restores proper temperature regulation and fan control.
  • Prevents electrical faults and inconsistent airflow.
  • Improves reliability and system efficiency.
  • Ensures accurate sensor readings for stable operation.
  • Compatible with Porsche 911, Boxster, Cayman, Panamera, Macan, Cayenne, and classic models.
  • Ideal for diagnostics, maintenance, and complete system refurbishments.

Replacing these components during HVAC servicing helps prevent secondary issues like burnt connectors, blown fuses, or motor failure.

Highlights

  • Precision-engineered Porsche HVAC relays, sensors, and resistors.
  • Designed for accuracy, reliability, and thermal efficiency.
  • Durable, corrosion-resistant materials for long service life.
  • Direct-fit replacements for all Porsche climate systems.
  • Essential for consistent heating, cooling, and fan control.
  • Suitable for repairs, restorations, and system upgrades.       

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