# 3842015 Thermostat | Genuine Volvo Penta Part

## 🔧 Product Description

Genuine Volvo Penta thermostat rated at 90 °C, from the Cooling System group, weighing 0.113 kg and listed for 12 applications on D series engines. The 90 °C opening temperature is the ordering detail that matters, and o-ring 3842016 shares the same 12 applications, so fit the two together.

## 🚤 Compatibility

Typically suits:

-   Volvo Penta D2-40
-   Volvo Penta D2-40B
-   Volvo Penta D2-40F
-   Volvo Penta D1-30
-   Volvo Penta D1-30B
-   Volvo Penta D1-30F
-   Volvo Penta D1-13
-   Volvo Penta D1-13B
-   Volvo Penta D1-13F
-   Volvo Penta D1-20
-   Volvo Penta D1-20B
-   Volvo Penta D1-20F

-   **Engine Family:** D
-   **HP Range:** 13-40 HP

## ⚙️ Key Features

-   Rated at 90 °C
-   0.113 kg
-   12 applications on D series engines
-   O-ring 3842016 covers the same 12 applications

## 🔌 Function

Regulates coolant flow to hold the engine at its designed running temperature, staying shut until 90 °C so the engine warms quickly, then opening to admit cooling flow.

## ⚠️ Common Signs of Failure

-   Engine overheating, or running hot only under load
-   Engine never reaching normal temperature and running cold
-   Temperature gauge swinging up and down instead of settling
-   Thermostat stuck open or shut, or corroded and furred when removed
-   Heater or calorifier output poor because the engine is not warming through

## 🛠️ Service Notes

-   Fit a new o-ring or gasket with the thermostat every time, and 3842016 is the matching o-ring here
-   Fit the thermostat the right way round with any bleed hole positioned as specified, then bleed the system properly
-   If the old thermostat is heavily scaled, flush the circuit before fitting the new one

## 🔄 Supersession & Cross Reference

### Aftermarket / Verified Equivalents

-   Recmar: RM3842015

## 📦 Condition

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

## Details

- **Price:** 168.72 AUD
- **Vendor:** Volvo Penta
- **Type:** Cooling System
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 168.72 AUD | In stock |

## Images

- 3842015 Thermostat | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/3842015-thermostat-genuine-volvo-penta)
> Updated: 2026-09-06