---
product_id: 50274225
title: "THT-015 Engine Coolant Thermostat - Compatible with Select Lexus GS400, GS430, GX470, LS400, LS430, LX450, LX470, SC400, SC430 Toyota 4Runner, Land Cruiser, Sequoia, Tundra"
price: "$57"
currency: NZD
in_stock: true
reviews_count: 8
url: https://www.desertcart.nz/products/50274225-tht-015-engine-coolant-thermostat-compatible-with-select-lexus-gs400
store_origin: NZ
region: New Zealand
---

# Perfect OE form, fit & function OE specified operating temp High-quality durable materials THT-015 Engine Coolant Thermostat - Compatible with Select Lexus GS400, GS430, GX470, LS400, LS430, LX450, LX470, SC400, SC430 Toyota 4Runner, Land Cruiser, Sequoia, Tundra

**Price:** $57
**Availability:** ✅ In Stock

## Summary

> 🔥 Keep your engine cool, your drive hot! 🔥

## Quick Answers

- **What is this?** THT-015 Engine Coolant Thermostat - Compatible with Select Lexus GS400, GS430, GX470, LS400, LS430, LX450, LX470, SC400, SC430 Toyota 4Runner, Land Cruiser, Sequoia, Tundra
- **How much does it cost?** $57 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nz](https://www.desertcart.nz/products/50274225-tht-015-engine-coolant-thermostat-compatible-with-select-lexus-gs400)

## Best For

- Customers looking for quality international products

## Why This Product

- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Durability You Can Trust:** Crafted from premium materials for long-lasting, dependable cooling
- • **Seamless OE Compatibility:** Engineered to match original AISIN specs ensuring flawless fit and function
- • **Wide Vehicle Compatibility:** Fits select Lexus and Toyota models, covering your trusted ride’s needs
- • **Global Engineering Excellence:** Backed by AISIN’s 50+ years of award-winning automotive innovation
- • **Precision Temperature Control:** Maintains exact OE operating temperature for optimal engine performance

## Overview

The AISIN THT-015 Engine Coolant Thermostat delivers precise temperature regulation with exact OE specifications, ensuring your Lexus or Toyota runs efficiently and reliably. Manufactured with premium materials and backed by AISIN’s decades of automotive expertise, this thermostat guarantees perfect fitment and long-term durability across multiple popular vehicle models.

## 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: Aisin Quality - From the original part manufacturer Aisin. You really can't go wrong with quick shipping from desertcart either. Grade buy!
Review: Worth it to get Aisin *doesn't include gasket - My Water Pump started leaking on my 2005 Tundra 4.7 It was intermittent for a while, so I just kept the coolant topped up. It started getting worse, so I started ordering all the parts. Water pump, timing belt, ect. I hooked up my OBD scanner to see the actual temperature of the coolant, and it was hovering from 205 to 210, which is hotter than ideal for sure. After a long and exciting repair job, everything is back together, and 2 weeks later, the coolant temp stays at 186-187 consistently. I replaced the water pump, radiator, timing belt, tensioner and drive belt, also, but it's good to know the new Thermostat is working perfectly. I would venture to guess the old one was not Aisin/Toyota. I myself was tempted to get a cheaper one, as the parts list got bigger. But the old thermostat was definitely worn out. The rubber parts were all misshapen and definitely not sealing, or allowing flow like they should. Same with the radiator cap, the rubber was stretched out. So, while I replaced most of the entire cooling system, and the new thermostats effect difficult to say, it good to know it's working perfectly. The temperature would swing +/- 10 degrees when driving around before, now it maybe moves +/- 2. Side note, as many have said before, the dash temperature guage is not very helpful with these things. During the whole fiasco, it never read anything but right in the middle. If you hit 230 or 240 degrees, I'm sure it would let you know, but at that point things are getting bad. I use a $20 Bluetooth obd scanner I got here on desertcart, and it's been a great investment. Has helped me solve several issues.

## 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
- Gasket not included
- Compatible with select vehicles (engine may affect fitment - verify specific fitment details with fit checker above): LEXUS: 1998-00 GS400, 2001-07 GS430, 2003-09 GX470, 1998-00 LS400, 2001-06 LS430, 1996-97 LX450, 1998-07 LX470
- Compatible with (continued): LEXUS: 1998-00 SC400, 2002-10 SC430; TOYOTA: 2003-09 4Runner, 1993-07 Land Cruiser, 2001-09 Sequoia, 2000-09 Tundra

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B01LZVUYEZ |
| Best Sellers Rank | #18,483 in Automotive ( See Top 100 in Automotive ) #18 in Automotive Replacement Engine Thermostats |
| Brand | AISIN |
| Customer Reviews | 4.6 4.6 out of 5 stars (255) |
| Date First Available | September 22, 2016 |
| Exterior | Machined |
| Item Weight | 7 ounces |
| Item model number | THT-015 |
| Manufacturer | AISIN |
| Manufacturer Part Number | THT-015 |
| Model | AISIN |
| OEM Part Number | 90916-03100 |
| Position | Center |
| Product Dimensions | 3 x 3 x 2.8 inches |

## Images

![THT-015 Engine Coolant Thermostat - Compatible with Select Lexus GS400, GS430, GX470, LS400, LS430, LX450, LX470, SC400, SC430 Toyota 4Runner, Land Cruiser, Sequoia, Tundra - Image 1](https://m.media-amazon.com/images/I/816hpM3IRgL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Aisin Quality
*by T***T on December 3, 2025*

From the original part manufacturer Aisin. You really can't go wrong with quick shipping from Amazon either. Grade buy!

### ⭐⭐⭐⭐⭐ Worth it to get Aisin *doesn't include gasket
*by B***D on November 11, 2023*

My Water Pump started leaking on my 2005 Tundra 4.7 It was intermittent for a while, so I just kept the coolant topped up. It started getting worse, so I started ordering all the parts. Water pump, timing belt, ect. I hooked up my OBD scanner to see the actual temperature of the coolant, and it was hovering from 205 to 210, which is hotter than ideal for sure. After a long and exciting repair job, everything is back together, and 2 weeks later, the coolant temp stays at 186-187 consistently. I replaced the water pump, radiator, timing belt, tensioner and drive belt, also, but it's good to know the new Thermostat is working perfectly. I would venture to guess the old one was not Aisin/Toyota. I myself was tempted to get a cheaper one, as the parts list got bigger. But the old thermostat was definitely worn out. The rubber parts were all misshapen and definitely not sealing, or allowing flow like they should. Same with the radiator cap, the rubber was stretched out. So, while I replaced most of the entire cooling system, and the new thermostats effect difficult to say, it good to know it's working perfectly. The temperature would swing +/- 10 degrees when driving around before, now it maybe moves +/- 2. Side note, as many have said before, the dash temperature guage is not very helpful with these things. During the whole fiasco, it never read anything but right in the middle. If you hit 230 or 240 degrees, I'm sure it would let you know, but at that point things are getting bad. I use a $20 Bluetooth obd scanner I got here on Amazon, and it's been a great investment. Has helped me solve several issues.

### ⭐⭐⭐⭐⭐ OEM quality but don’t come with gasket!
*by S***Y on June 24, 2025*

Fits like OEM. Don’t forget to buy gasket! You must buy separately,,,, that part stinks.

## Frequently Bought Together

- AISIN THT-015 Engine Coolant Thermostat - Compatible with Select Lexus GS400, GS430, GX470, LS400, LS430, LX450, LX470, SC400, SC430 Toyota 4Runner, Land Cruiser, Sequoia, Tundra
- AISIN TKT-021 Engine Timing Belt Kit with Water Pump - Compatible with Select Lexus GS400, GS430, GX470, LS400, LS430, LX470, SC400, SC430 Toyota 4Runner, Land Cruiser, Sequoia, Tundra
- Toyota Genuine Thermostat Gasket

---

## 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.nz/products/50274225-tht-015-engine-coolant-thermostat-compatible-with-select-lexus-gs400](https://www.desertcart.nz/products/50274225-tht-015-engine-coolant-thermostat-compatible-with-select-lexus-gs400)

---

*Product available on Desertcart New Zealand*
*Store origin: NZ*
*Last updated: 2026-02-10*