Heater box control sleeve. Porsche 356 A / 356 B / 356 C  ❭  64421175100

Heater Box Control Sleeve.

Restore smooth and dependable operation of the vehicle's heating controls with this OE Match Heater Box Control Sleeve. Designed for compatible classic Porsche applications, this sleeve forms part of the heater box control mechanism, helping support the correct movement and positioning of the associated heater control components.

Fits:
Porsche 356 A (NOT for Carrera)
Porsche 356 B
Porsche 356 C

Diagram Ref No 8

The heater boxes form part of the vehicle's heating system, directing heated air toward the cabin when required. The control mechanism allows the heater boxes or associated flaps to open and close so that the flow of warm air can be regulated. Small components such as the control sleeve are important for maintaining correct alignment and controlled movement within this mechanism.  

What This Product Does:

• Forms part of the heater box operating mechanism.
• Helps support and guide the associated heater control components.
• Promotes smooth movement of the heater box control mechanism.
• Helps maintain correct alignment during heater operation.
• Supports accurate opening and closing of the associated heater controls.
• Helps the driver regulate heated airflow into the cabin.
• Reduces unwanted movement caused by an excessively worn sleeve.
• Helps maintain dependable operation of the heating system.
• Replaces a worn, seized, damaged or missing control sleeve.
• Provides an OE-style replacement for compatible classic Porsche applications.  

Symptoms Of Wear Or Failure:

• Heater controls becoming stiff or difficult to operate.
• Excessive free play in the heater control mechanism.
• Jerky or inconsistent control movement.
• Heater boxes failing to open or close fully.
• Difficulty switching the cabin heat completely on or off.
• Inconsistent heater output despite moving the controls.
• Rattling or looseness around the heater control mechanism.
• Binding or sticking of associated control components.
• Visible wear, corrosion or physical damage to the sleeve.
• The sleeve has seized around the associated component.
• The original sleeve is missing.
• Wear discovered while servicing the heater boxes or control linkage.  

Why Replacement Matters:

• The heater box control system depends on multiple small mechanical components working together with minimal unwanted movement. A worn or seized sleeve can interfere with this operation and prevent the heater boxes from responding correctly to driver input.
• If the sleeve develops excessive wear, the control mechanism may gain unwanted free play. This can reduce the amount of movement transferred to the heater box, potentially preventing it from reaching its fully open or closed position.
• A seized or corroded sleeve can create the opposite problem by increasing resistance. Excessive force may then be required at the heater control, potentially placing additional strain on cables, levers, mounting points and other components.
• Incomplete heater box closure can also allow unwanted hot air to enter the cabin even when the heating system is nominally switched off. Conversely, incomplete opening may reduce available cabin heating when it is needed.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

64421175100

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