Relays / Sensors / Resistors
- Porsche 970.2 Panamera 4 V6 3.6L 4WD (310Hp) 2014-16
- Porsche 928S4 5.0L 1987-92
- Porsche 928GT 5.0L 1989-91
- Porsche 928GTS 5.4L 1992-95
This is a genuine Porsche series resistor (part number 928 616 101 00) designed for the HVAC/blower motor circuit in the Porsche 928 series. It’s an essential replacement part used in the heating, ventilation and air-conditioning system.
Fits:
Porsche 928 1989 - 1993
Diagram ref no 37
Part Numbers / References: OE references 928-616-101-00 or superseded 928-618-101-01
What it’s used for:
• It regulates the blower motor speed in the vehicle’s climate control system, allowing your car’s heater or air-conditioning fan to run at the correct speeds (low, medium, high).
• In the classic Porsche 928, this resistor ensures the blower motor receives the correct electrical resistance so that fan speeds are stable and predictable rather than erratic. 928sRus, Inc.
• When this resistor fails, you may experience blower fan only working on one speed (often high), or not working at all - making it impossible to properly control cabin climate.
Why it needs replacing:
• With age, repeated heat cycling and electrical load cause wear on this resistor unit. It can overheat, degrade, or fail, causing loss of fan speed control.
• A faulty resistor can lead to reduced functionality of your HVAC system: blower motor stuck on one speed, no fan at all, or intermittent operation.
• Replacing it with a genuine OEM part restores correct operation, maintains authenticity and reliability of your Porsche.
When to replace it:
• Whenever your blower motor isn’t working correctly - e.g., only high speed works, or no speed control at all.
• During routine HVAC system service or restoration of a classic Porsche 928, especially as these original components age.
• If the resistor shows signs of corrosion, overheating damage or the fan control switch has been replaced without improved function.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92861610100
The product you are viewing cross references to these numbers
- Porsche 970.2 Panamera 4 V6 3.6L 4WD (310Hp) 2014-16
- Porsche 928S4 5.0L 1987-92
- Porsche 928GT 5.0L 1989-91
- Porsche 928GTS 5.4L 1992-95
Air-conditioner series resistor is designed for the HVAC blower control in the Porsche 928 series. Installed within the climate-control system, this resistor pack provides multiple steps of electrical resistance, enabling the blower motor to run at different fan speeds (low, medium, high). Built to match Porsche’s original specification.
Fits:
Porsche 928 1989 - 1993
Diagram ref no 37
• Position on Vehicle: Within the HVAC unit - typically mounted near the blower motor or inside the footwell dash area, functioning as the speed-control resistor pack for the A/C blower.
• Part Numbers / References: OE references 928-616-101-00 or superseded 928-618-101-01.
• Applications: Suitable when the blower motor is stuck at one speed (typically high only), blower fails on low/medium speeds, or after servicing blower motor or climate control system.
While compact, the A/C blower resistor plays a vital role: degraded or failed resistors commonly cause the blower to be stuck on high only or no low/medium speeds - impacting comfort, defrost performance and cabin ventilation. Replacing with the correct resistor restores full speed control, safer driving (better defrost), improved comfort and avoids fan motor overdrive.
When to replace:
• Blower only runs on high speed or fails at lower speeds
• A/C or heater airflow is weak despite servicing the blower motor
• Blower control selector has no effect or is inconsistent
• You’re servicing or replacing the blower motor or HVAC system in your Porsche 928
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92861610100
The product you are viewing cross references to these numbers
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.
