# 23594887 Thermostat Kit | Genuine Volvo Penta Part

🔧 Product Description

  

Genuine Volvo Penta D4 G-Series Heat-Exchanger Thermostat Kit - Part Number: 23594887

  

A genuine Volvo Penta coolant thermostat package installed in the heat-exchanger housing of selected D4 G-series engines. The thermostat controls the main closed-circuit coolant flow through the heat exchanger.

  

Kit Contents:

  

• 1 × calibrated coolant thermostat - serviced under 23594887

• 1 × O-ring - 3583830

• 1 × O-ring - 3583831

• 1 × O-ring - 3583832

  

⚙️ Key Features

  

• Genuine Volvo Penta D4-G thermostat kit

• Correct Volvo Penta part number 23594887

• Installed in heat-exchanger housing 23397955 / 40005783 family

• Includes the three associated housing O-rings

• Engine and heat-exchanger serial number determine fitment

  

🔄 Supersession & Cross Reference

  

OEM Supersession Chain:

  

• 23594887 current D4-G heat-exchanger thermostat-kit reference

  

OEM / Related Numbers:

  

• 23594887

• VOE23594887

• 3583830

• 3583831

• 3583832

• 23042274

• 23397955

• 40005783

  

Aftermarket / Verified Equivalents:

  

• No aftermarket equivalent

  

🚤 Compatibility

  

Commonly used on:

  

• D4 G-series closed-circuit cooling systems

• Heat-exchanger thermostat service

  

Typically suits:

  

• Engine / drive models:

• D4-145I-G

• D4-150A-G

• D4-175I-G

• D4-230A/I-G

• D4-270A/I-G

• D4-300A/I-G

• D4-320A/I-G where specified

  

• Engine Type: Volvo Penta D4 G-series marine diesel

• Serial Range: Heat-exchanger housing and complete engine serial-number controlled

  

🔌 Function

  

The thermostat regulates coolant flow through the heat exchanger so the engine reaches and maintains the designed operating temperature.

  

Common signs of failure:

  

• Engine overheats or runs too cool

• Temperature fluctuates under load

• O-rings leak at the housing

• Thermostat sticks or corrodes

• Incorrect thermostat fitted to the heat-exchanger version

  

📦 Condition

  

• Genuine Volvo Penta part

• Brand new

• Supplied in original or equivalent packaging

## Details

- **Price:** 482.78 AUD
- **Vendor:** Volvo Penta
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 482.78 AUD | In stock |

## Images

- 23594887 Thermostat Kit | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/23594887-thermostat-kit-genuine-volvo-penta)
> Updated: 2026-07-30