# 3887780 Thermostat | Genuine Volvo Penta Part

## 🔧 Product Description

Genuine Volvo Penta thermostat from the Cooling System group, weighing 0.399 kg.

## ⚙️ Key Features

-   0.399 kg
-   Cooling System group
-   Genuine Volvo Penta thermostat

## 🔌 Function

Holds coolant in the engine until it reaches working temperature, then opens to let it pass to the heat exchanger, regulating running temperature in both directions.

## ⚠️ Common Signs of Failure

-   Engine slow to warm or never reaching normal temperature
-   Overheating while the top hose stays cool
-   Temperature gauge swinging up and down
-   Thermostat stuck open or closed when tested in hot water
-   Coolant loss following an overheating cycle

## 🛠️ Service Notes

-   Renew the thermostat seal or gasket at the same time and refill slowly so no air is trapped
-   No opening temperature is published against this number, so read the marking stamped on the old unit before fitting

## 🔄 Supersession & Cross Reference

### Other-Brand OEM Numbers

-   Mahle: THD 3 76

### Aftermarket / Verified Equivalents

-   Calorstat by Vernet: THS18201.76
-   Calorstat by Vernet: THCT18201.76
-   DT Spare Parts: 2.15640
-   Febi Bilstein: 40673
-   NRF: 725438
-   Auger: 91254
-   Sampa: 036.056

## 📦 Condition

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

## Details

- **Price:** 587.53 AUD
- **Vendor:** Volvo Penta
- **Type:** Cooling System
- **Tags:** Volvo Penta

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 587.53 AUD | In stock |

## Images

- 3887780 Thermostat | Genuine Volvo Penta Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/3887780-thermostat-genuine-volvo-penta)
> Updated: 2026-10-12