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Vents / Grilles
By OE Match
.jpg?width=197 "Vacuum Unit for Footwell Heater Vent. Porsche 928 1980-95 - 92857407906 - PVSTF")
- Porsche 928 4.5L 1978-82
- Porsche 928S 4.7L 1981-83
- Porsche 928S2 4.7L 1984-86
- Porsche 928S4 5.0L 1987-92
- Porsche 928GT 5.0L 1989-91
- Porsche 928GTS 5.4L 1992-95
Footwell Heater Vent Vacuum Unit – HVAC Control Actuator
High-quality replacement footwell heater vent vacuum unit designed for Porsche 928 models.
This component is part of the vehicle’s HVAC (heating,
ventilation, and air conditioning) system, responsible for controlling the
opening and closing of the footwell air vents. It operates via vacuum pressure
to regulate airflow distribution within the cabin, ensuring proper heating
performance and passenger comfort.
Fits:
Porsche 928 4.5L 1980-82
Porsche 928S 4.7L 1981-83
Porsche 928S2 4.7L 1984-86
Porsche 928S4 5.0L 1987-92
Porsche 928GT 5.0L 1989-91
Porsche 928GTS 5.4L 1992-95
Diagram ref no 5
Manufactured to OEM specifications, this vacuum unit ensures precise fitment and reliable operation—ideal for restoring correct airflow control and resolving HVAC system faults.
Key Features
• Direct replacement HVAC vacuum actuator
• Suitable for Porsche 928 models
• Controls footwell heater vent operation
• Restores proper airflow distribution
• OEM-style fit and function
• Durable construction for long-term reliability
Function and Purpose
The vacuum unit controls airflow direction within the cabin.
It helps to:
• Open and close footwell heater vents
• Regulate cabin air distribution
• Maintain effective heating performance
• Support overall HVAC system operation
Why Replace Your Vacuum Unit
Over time, vacuum actuators can fail due to age or diaphragm wear.
Common issues include:
• No airflow to footwell vents
• Stuck or non-responsive vents
• Weak or inconsistent cabin heating
• Vacuum leaks affecting HVAC performance
Replacing the unit restores proper heater function and airflow control.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
92857407906
The product you are viewing cross references to these numbers
OEMatch Vents / Grilles — Fit, Function, Confidence
For Porsche models, vents and grilles direct and regulate cabin airflow, supporting heating, cooling and demisting while contributing to interior appearance and comfort. OEMatch vents and grilles are compatible replacements engineered to original-spec dimensions and tolerances — a practical option when genuine or OEM parts are unavailable. They restore precise airflow distribution, reduce noise from turbulent flows and maintain a factory-like finish.
Available Types
Dashboard and centre console vents
- Door air outlets and side grilles
- Exterior intake grilles where applicable
OEM (Original Equipment Manufacturer) parts are made by the same company that produced your Porsche’s original vents / grilles.
OE (Original Equipment) refers to parts matching original specifications for the vents / grilles and may be supplied by alternative manufacturers. Aftermarket parts offer alternative options, sometimes with enhanced features or better value. OEMatch supplies non-OEM vents / grilles engineered as direct-fit alternatives to OEM parts, made to original-spec dimensions and tolerances for Porsche models.
Vents and grilles route air from the HVAC unit into the cabin via adjustable louvers and fixed outlets. Typical items are moulded from heat-resistant plastics and include mounting tabs or clips that locate into the dash or door panels. Proper fit and intact sealing prevent air leaks, preserve blower efficiency and ensure even temperature control across seats and glazing. OEMatch maintains a broad Porsche-focused catalogue and continues to develop new product lines to support restorations and routine maintenance.
Benefits Include- Restores correct airflow direction and volume
- Improves demisting and climate response
- Renews interior appearance with matched styling
- UV exposure and heat causing fading or cracking
- Broken or worn louvers and adjustment mechanisms
- Damaged mounting tabs, clips or seals leading to loose fit and air leaks
Replacing worn or damaged vents and grilles restores consistent cabin airflow, reduces the risk of cold or hot spots, and preserves interior aesthetics that matter for Porsche vehicles. Careful inspection of duct seals and mounting points during replacement helps maintain HVAC performance and quiet operation.
Advantages- Direct replacements that match original form and mounting points
- Durable, heat-resistant materials for long service life
- Suitable for restorations and routine repair tasks
Support & Advice
These items can appear straightforward to fit but may require specific procedures such as correct routing, adjustment and securing of end fittings. If you lack the correct tools or are unsure about hidden fastenings or sensors, seek professional installation.
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