# 21866532 Coolant Pipe | Genuine Volvo Penta Part

## 🔧 Product Description

A genuine coolant pipe used in the closed-cooling system on Volvo Penta D11B and D11C marine propulsion engines. It forms a rigid section of the thermostat, pump or heat-exchanger circuit.

## 🚤 Compatibility

Typically suits:

-   Volvo Penta D11C1-A MP
-   Volvo Penta D11C3-A MP
-   Volvo Penta D11C2-A MP
-   Volvo Penta D11C4-A MP
-   Volvo Penta D11B3-A MP
-   Volvo Penta D11B4-A MP
-   Volvo Penta D11B2-A MP
-   Volvo Penta D11B1-A MP

-   **Engine Family:** D
-   **HP Range:** Approximately 625-725 HP
-   **Year Range:** Approximately 2007 - 2020

## ⚙️ Key Features

-   Coolant pipe for the closed-cooling system on D11B and D11C marine propulsion engines
-   0.261 kg
-   Listed for 8 applications across the D range
-   Forms a rigid section of the thermostat, pump or heat-exchanger circuit

## 🔌 Function

Carries coolant along a fixed section of the closed circuit, holding the route between the thermostat, pump and heat exchanger so the flexible hoses only have to cover short movements.

## ⚠️ Common Signs of Failure

-   Coolant loss with a crusted white or coloured deposit at a joint
-   Header tank needing topping up with no obvious external leak
-   Temperature creeping up under load
-   Pipe pitted through or corroded thin on strip-down
-   Hose ends hardened and cracked where they grip the pipe

## 🛠️ Service Notes

-   Renew the hoses and clamps that land on this pipe at the same time - a corroded pipe has usually been weeping into them for a while
-   Check the pipe's sealing seats for pitting before fitting new hoses; a pitted seat will weep again

## 🔄 Supersession & Cross Reference

### OEM / Related Numbers

-   21683478 - related coolant pipes
-   21814083 - related coolant pipes
-   21817370 - related coolant pipes
-   21621182 - nipple
-   1547253 - sealing rings
-   1547254 - sealing rings
-   1546531 - locking brace
-   3886496 - related pipes
-   3886500 - related pipes
-   21021925 - connecting pipes
-   20555313 - connecting pipes
-   20479636 - sealing strip
-   21363801 - cover
-   21412647 - thermostat

## 📦 Condition

-   Genuine Volvo Penta part
-   Brand new
-   Supplied in original or equivalent packaging

## Details

- **Price:** 523.39 AUD
- **Vendor:** Volvo Penta
- **Type:** Hoses & Pipes
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 523.39 AUD | In stock |

## Images

- 21866532 Coolant Pipe | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/21866532-coolant-pipe-genuine-volvo-penta)
> Updated: 2026-10-11