Control vent heater box . Porsche 911 / 912 1969-89  ❭  91157134701

Porsche 928 Leather Dashboard Ventilation Grille - Windshield Defog Vent

Restore Proper Windshield Defogging and Interior Finish

The Porsche 928 leather dashboard is equipped with dedicated ventilation grilles that direct airflow toward the windscreen to prevent fogging and maintain clear visibility. These defog vents are essential components of the climate control system and interior trim.

Fits:

• Porsche 928 4.5L 1978-82
• Porsche 928S 4.7L 1981-83
• Porsche 928S2 4.7L 1984-86
• Porsche 928S4 5.0L 1987-92       

Originally supplied by Porsche, this part is now NLA (No Longer Available) and often becomes brittle, cracked or damaged over time. This high-quality reproduction is identical in appearance and function to the original and is manufactured from similar durable plastic material.

The ventilation grille sits within the leather dashboard and allows heated or ambient air to flow directly onto the inside of the windshield.

Its function includes:

• Directing airflow to prevent windshield fogging
• Assisting with defrosting in cold conditions
• Supporting overall climate control efficiency
• Maintaining the clean factory appearance of the dashboard

Without a properly functioning defog vent grille, airflow can be restricted, reducing visibility and affecting interior aesthetics.

Why Porsche 928 Defog Vent Grilles Fail

After decades of heat exposure and UV radiation, original 928 dashboard vents commonly suffer from:

• Plastic cracking or splitting
• Warping due to sun exposure
• Brittleness from ageing materials
• Damage during dashboard reupholstery
• Broken mounting tabs

When restoring or reupholstering a leather dashboard, the original vent grille often cannot be reused due to its fragile condition.

Why You Should Upgrade

You should consider replacing your Porsche 928 dashboard defog vent grille if:

• You are reupholstering or restoring the dashboard
• The original vent is cracked or faded
• Mounting points are broken
• Airflow to the windshield is reduced
• You want to restore factory-correct interior appearance

Replacing both left and right vent grilles is recommended for consistent fitment, colour matching and symmetrical interior presentation.

This reproduction part ensures:

• Correct airflow performance
• Clean integration into leather dashboards
• OEM-style fit and finish
• Long-term durability compared to aged originals

Perfect for concours restorations, full interior refurbishments or preventative replacement.

Key Benefits at a Glance

• Direct replacement for NLA Porsche part
• Identical appearance to original design
• Manufactured from durable plastic material
• Restores windshield defog airflow
• Suitable for leather dashboard 928 models
• Recommended to replace both sides for best results
• Ideal for restoration and reupholstery projects       

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.

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.