# 21708508 Switch | Genuine Volvo Penta Part

🔧 Product Description

  

Genuine Volvo Penta Cooling-System Alarm / Control Switch - Part Number: 21708508

  

Electrical switch used in a Volvo Penta cooling-system monitoring circuit. It provides an alarm or control input when coolant level, temperature or pressure reaches the specified switching point.

  

⚙️ Key Features

  

• Genuine Volvo Penta electrical component

• Factory operating range and connector

• Designed for the original control or alarm circuit

• Marine/industrial vibration resistance

• System and serial verification required

  

🔄 Supersession & Cross Reference

  

OEM Supersession Chain:

  

• 21708508 (current OEM service number)

  

OEM / Related Numbers:

  

• VOE21708508

• Related coolant level guard: 881965

• Related sensor: 21876480

• Temperature sensor: 3586830

• Thermo monitor: 848829

• Related sensor references: 20513340, 20459880 and 20924088

  

Aftermarket / Verified Equivalents:

  

• No aftermarket equivalent

  

🚤 Compatibility

  

Commonly used on:

  

• Volvo Penta marine and industrial engine cooling-system alarm circuits

  

Typically suits:

  

• Engine models / systems:

• Engine installation whose cooling-system diagram specifies switch 21708508

  

• System Type: Coolant alarm/control switch

• Fitment Note: Confirm monitored condition, switching point, thread and connector

  

🔌 Function

  

Changes electrical state when the monitored cooling-system condition reaches the calibrated threshold.

  

Common signs of failure:

  

• False coolant alarm

• No warning during an actual fault

• Open or short circuit

• Intermittent switching

• Leakage or corrosion at the connector

  

📦 Condition

  

• Genuine Volvo Penta part

• Brand new

• Supplied in original or equivalent packaging

## Details

- **Price:** 644.52 AUD
- **Vendor:** Volvo Penta
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 644.52 AUD | In stock |

## Images

- 21708508 Switch | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/21708508-switch-genuine-volvo-penta)
> Updated: 2026-08-03