# 21664189 Filler Cap | Genuine Volvo Penta Part

🔧 Product Description

  

Genuine Volvo Penta TAD7 Cooling-System Filler Cap - Part Number: 21664189

  

A pressure-rated coolant filler cap used on the designated TAD7 radiator or expansion-tank cooling package.

  

⚙️ Key Features

  

• Cooling-system pressure cap

• Controls pressure and vacuum recovery

• Heat- and coolant-resistant sealing element

• Correct filler-neck locking profile

• Designed for heavy-duty generating-set service

  

🔄 Supersession & Cross Reference

  

OEM Supersession Chain:

  

• Current OEM reference: 21664189

  

OEM / Related Numbers:

  

• 21664189

• 21661750 - Related expansion tank

• 21661739 / 21883422 - Related radiators

  

Aftermarket / Verified Equivalents:

  

• No aftermarket equivalent

  

🚤 Compatibility

  

• Volvo Penta TAD7 radiator and expansion-tank systems specifying cap 21664189

• Cap pressure rating and filler-neck profile must match the cooling package

  

🔌 Function

  

The cap seals the cooling system, maintains operating pressure and allows controlled coolant recovery as the engine cools.

  

Common signs of failure or damage:

  

• Coolant venting at normal temperature

• Pressure not retained

• Hardened or cracked seal

• Cap difficult to lock

• Repeated coolant loss

  

📦 Condition

  

• Genuine Volvo Penta part

• Brand new

• Supplied in original or equivalent packaging

## Details

- **Price:** 80.72 AUD
- **Vendor:** Volvo Penta
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 80.72 AUD | In stock |

## Images

- 21664189 Filler Cap | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/21664189-filler-cap-genuine-volvo-penta)
> Updated: 2026-08-02