Air Conditioning Refrigerant Line. Porsche 996 C4S / 996 turbo  ›  99657309405

Air Conditioning Refrigerant Line 

Fits

• Porsche 996 C4S 3.6L 09/01-2005
• Porsche 996 TURBO 2000-05

Diagram Ref No 11

What This Product Does

This line provides a sealed route for refrigerant travelling between designated components in the air-conditioning system. The supplied exploded-parts information describes the component as both a pressure line and a refrigerant line within the applicable 996 assemblies.

Functions

• Carries refrigerant through the air-conditioning circuit
• Connects the relevant factory climate-control components
• Helps retain the refrigerant charge within a sealed system
• Supports normal cooling and dehumidification when the system is correctly serviced

Technical Details

• Genuine Porsche component
• Part number: 99657309405
• Exploded-diagram descriptions: pressure line and refrigerant line
• Quantity shown: one per applicable diagram assembly
• Identified for C4S in the refrigerant circuit 996 1998–05 diagram
• Also referenced in the refrigerant circuit 996 TURBO 2001–05 diagram

Symptoms of Fault

• Cooling performance gradually becomes weaker or warm
• The system loses its refrigerant charge after servicing
• Oily residue or leak-detection dye appears near the line or connections
• Corrosion, abrasion, cracking or impact damage is visible
• Hissing may be present where a significant leak has developed
• Demisting performance is reduced when cooling and dehumidification are needed

Why Replacement Matters

A leaking or damaged line prevents the air-conditioning circuit from retaining the correct refrigerant charge. Renewing the affected component enables the system to be leak-tested, evacuated and recharged correctly rather than relying on repeated regassing. Inspect the connection seals, retaining supports and adjacent pipework during installation. Refrigerant recovery and charging require suitable air-conditioning service equipment.

FAQs

• Does weak cooling confirm that this line is faulty?
  No. Refrigerant may escape from several points in the circuit, so diagnosis and leak testing should be completed before replacement.
• Can the system be used without recharging after installation?
  No. Once opened, the circuit must be evacuated, checked for leak tightness and filled with the specified refrigerant quantity.
• Should the connection seals also be inspected?
  Yes. Hardened or damaged O-rings can cause leakage even when the line itself remains sound.
• How should compatibility be checked?
  Confirm part number 99657309405 against the vehicle identification number, model year and exact air-conditioning configuration.