---
product_id: 79603338
title: "THT-004 Engine Coolant Thermostat with Housing and Gasket - Compatible with Select Lexus GS300, GS350, GS450h, IS250, IS300, IS350, RC300, RC350"
brand: "aisin"
price: "€ 70.95"
currency: EUR
in_stock: true
reviews_count: 11
category: "Aisin"
url: https://www.desertcart.hr/products/79603338-tht-004-engine-coolant-thermostat-with-housing-and-gasket-compatible
store_origin: HR
region: Croatia
---

# OE matched design Correct operating temp Includes housing & gasket THT-004 Engine Coolant Thermostat with Housing and Gasket - Compatible with Select Lexus GS300, GS350, GS450h, IS250, IS300, IS350, RC300, RC350

**Brand:** aisin
**Price:** € 70.95
**Availability:** ✅ In Stock

## Summary

> 🚗 Keep your engine cool and your ride smooth!

## Quick Answers

- **What is this?** THT-004 Engine Coolant Thermostat with Housing and Gasket - Compatible with Select Lexus GS300, GS350, GS450h, IS250, IS300, IS350, RC300, RC350 by aisin
- **How much does it cost?** € 70.95 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/79603338-tht-004-engine-coolant-thermostat-with-housing-and-gasket-compatible)

## Best For

- aisin enthusiasts

## Why This Product

- Trusted aisin brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Perfect Fit:** Compatible with select Lexus models for seamless integration.
- • **Durable Materials:** Manufactured for longevity and reliable cooling.
- • **Quality Assurance:** Backed by AISIN's reputation for excellence in automotive parts.
- • **Comprehensive Package:** Includes thermostat housing and gasket for convenience.
- • **Precision Engineering:** Crafted with OE technology for flawless performance.

## Overview

The AISINTHT-004 Engine Coolant Thermostat with Housing and Gasket is engineered for optimal performance in select Lexus models. With OE matched specifications, it ensures precise temperature regulation and dependable cooling system functionality. Manufactured in Japan with high-quality materials, this thermostat is designed for longevity and includes essential components for easy installation.

## Description

Product Description AISIN OE matched engine coolant thermostats are designed for efficient, consistent performance and manufactured using only the highest quality materials. With superior OE technology and know-how, AISIN ensures that every thermostat provides perfect OE form, fit, and function and features the correct OE specified operating temperature. AISIN is a leader in the development and production of high-quality original equipment matched components and systems for the automotive industry. Founded in 1965 to produce original equipment automotive parts, AISIN has grown into a $25+ billion global enterprise with approximately 70,000 employees worldwide. Superior products through engineering excellence, progressive technological development, and dedication to service are some factors which have contributed to bringing AISIN to its position as a multiple-award-winning global leader in automotive parts. Set Contains: Thermostat

Review: Perfect exact same design and fit - Works perfectly, unlike the aftermarket ones sold in stores with my car. Very specific and controlled temperature control
Review: OEM, fits and works perfect - Exactly what you would expect from an OEM product, perfect fit, and function.

## Features

- AISIN OE matched engine coolant thermostats are designed for efficient, consistent performance
- With superior OE technology and know-how, AISIN ensures that every thermostat provides perfect OE form, fit, and function
- Manufactured using only the highest quality materials for long life and dependable cooling system performance
- All AISIN thermostats feature the correct OE specified operating temperature
- Thermostat housing and gasket included
- Compatible with select vehicles (engine may affect fitment - verify specific fitment details with fit checker above): LEXUS: 2006 GS300, 2007-15 GS350, 2007-11,2013-18 GS450h, 2006-15 IS250, 2016-18 IS300, 2006-17 IS350, 2016-17 RC300, 2015-17 RC350

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | AISIN |
| Brand | AISIN |
| Model | AISIN |
| Item Weight | 7 ounces |
| Product Dimensions | 4.1 x 4.1 x 3.7 inches |
| Country of Origin | Japan |
| Item model number | THT-004 |
| Exterior | Machined |
| Manufacturer Part Number | THT-004 |
| OEM Part Number | 16031-31020 |
| Mirror Adjustment | Button Control |

## Images

![THT-004 Engine Coolant Thermostat with Housing and Gasket - Compatible with Select Lexus GS300, GS350, GS450h, IS250, IS300, IS350, RC300, RC350 - Image 1](https://m.media-amazon.com/images/I/81hVL5Sfa1L.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Perfect exact same design and fit
*by T***D on September 6, 2025*

Works perfectly, unlike the aftermarket ones sold in stores with my car. Very specific and controlled temperature control

### ⭐⭐⭐⭐⭐ OEM, fits and works perfect
*by M***. on June 25, 2024*

Exactly what you would expect from an OEM product, perfect fit, and function.

### ⭐⭐⭐⭐⭐ Fits and works great on 2007 IS350
*by F***Y on July 15, 2021*

Authentic OEM replacement for 2007 IS350. Works great, no leaks, and is identical to the original thermostat. Probably didn't need replace it but why not. It's extra insurance since I'm already replacing the water pump anyway.

## Frequently Bought Together

- AISIN THT-004 Engine Coolant Thermostat with Housing and Gasket - Compatible with Select Lexus GS300, GS350, GS450h, IS250, IS300, IS350, RC300, RC350
- AISIN WPT-137 New Engine Water Pump with Gaskets - Compatible with Select Lexus GS300, GS350, GS450h, IS250, IS300, IS350, RC300, RC350
- Bando USA 7PK1550 Serpentine Belt

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.hr/products/79603338-tht-004-engine-coolant-thermostat-with-housing-and-gasket-compatible](https://www.desertcart.hr/products/79603338-tht-004-engine-coolant-thermostat-with-housing-and-gasket-compatible)

---

*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-03-23*