Water level sender unit, windscreen washer reservoir. Porsche 964 / 993

Screen Wash Reservoir Level Sender Unit – Restore Accurate Washer Fluid Monitoring

This screen wash reservoir level sender unit is designed for the classic Porsche 964 and Porsche 993 models. It monitors the washer fluid level inside the reservoir and communicates with the dashboard warning system, ensuring the driver is alerted when the fluid level falls too low.

Fits:

• Porsche 964 (911) C2 1989-93
• Porsche 964 (911) C4 1989-93
• Porsche 964 (911) RS 3.6L 1991-93
• Porsche 964 (911) RS 3.8L 1991-93
• Porsche 964 (911) TURBO 3.3L 1991-93
• Porsche 964 (911) TURBO 3.6L 1991-93
• Porsche 993 (911) C2 1994-97
• Porsche 993 (911) C4 1994-97
• Porsche 993 (911) RS 1994-97
• Porsche 993 (911) C2S 1994-97
• Porsche 993 (911) C4S 1994-97
• Porsche 993 (911) TURBO 1994-96
• Porsche 993 (911) GT2 1994-97

Over the years, the original sender units can fail due to age, internal corrosion, worn float mechanisms or electrical degradation. When the sender fails, the dashboard may continuously display a low-level warning—or fail to warn at all—creating both inconvenience and a potential visibility hazard during poor weather conditions. Replacing the sender restores reliable fluid level detection and proper operation of the washer system.

What the Screen Wash Level Sender Unit Does

The sender unit:

• Detects the washer fluid level inside the reservoir
  
• Triggers the dashboard warning light when fluid is low
  
• Ensures driver visibility by prompting timely refills
• Prevents pump dry-running, which can shorten pump lifespan
  
• Integrates directly with the washer system wiring harness

This small but critical component keeps the washer system functional and reliable.

Why Washer Reservoir Sender Units Fail

Typical failure causes include:

• Float mechanism swelling or sticking due to age or contamination
  
• Internal corrosion from moisture exposure
  
• Electrical contact wear, leading to intermittent signals
  
• Cracked housings, allowing fluid entry
  
• Heat cycles and vibration, degrading internal components
  
• Build-up of washer fluid additives, causing float resistance

Symptoms include false dashboard warnings, no warning despite low fluid, erratic indicator behaviour or complete sensor failure.

Why You Should Replace a Faulty Level Sender Unit

Replacing the level sender ensures:

• Accurate washer fluid monitoring
• Restored dashboard warning functionality
• Improved driving safety in wet or dirty conditions
• Prevention of washer pump damage
• Reliable operation of a system essential for road visibility
• Preservation of originality and functionality in 964/993 classics

A new sender unit is a simple but essential upgrade for maintaining the practicality and reliability of older Porsche models.