Subaru Ascent Thermostats – OEM-Quality Engine Cooling

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Subaru Ascent Thermostats – High-Quality Performance & OEM Parts

Maintain optimal engine temperature and cooling efficiency with OEM Subaru Ascent thermostats. Whether you need a factory replacement or a performance upgrade, these thermostats provide precise temperature regulation, preventing engine overheating or inefficient cooling that can lead to engine wear.

Built from high-quality stainless steel and brass, these thermostats are engineered for corrosion resistance, longevity, and maximum reliability in all driving conditions.

21236AA070 - : Thermostat Gasket for Subaru Image

Thermostat Gasket

Subaru 21236AA070
Engine Cooling. Front. Ascent. WRX. Forester. With turbo. 2.0L hybrid. Impreza. With hybrid, lower. Crosstrek.
$3.06
MSRP $4.40
Save $1.34
30.5% Off
21210AA191 - : Engine Coolant Thermostat for Subaru Image

Engine Coolant Thermostat

Subaru 21210AA191
XV Crosstrek. Engine Coolant Thermostat - Subaru (21210AA191) The Engine Coolant Thermostat - Subaru (21210AA191) is a...
$23.32
MSRP $33.50
Save $10.18
30.4% Off
21210AA221 - : Engine Coolant Thermostat for Subaru Image

Engine Coolant Thermostat

Subaru 21210AA221
$27.45
MSRP $39.43
Save $11.98
30.4% Off
21236AA101 - : Engine Coolant Thermostat Gasket for Subaru Image

Engine Coolant Thermostat Gasket

Subaru 21236AA101
Transmission Cooling. Rear. Legacy, Outback. BRZ. Forester. Impreza. Crosstrek. 2.5L, 2024-25. 2.0L. from 07/13/2022.
$4.35
MSRP $6.25
Save $1.90
30.4% Off
11060AA300 - : Engine Coolant Thermostat Housing for Subaru Image

Engine Coolant Thermostat Housing

Subaru 11060AA300
Engine Cooling. Front. Ascent. Impreza. Crosstrek. WRX. 2.0L hybrid. Forester. With turbo. 2.5L, lower. Engine Coolant Thermostat...
$27.83
MSRP $39.98
Save $12.15
30.4% Off
11060AA360 - : Engine Coolant Thermostat Housing for Subaru Image

Engine Coolant Thermostat Housing

Subaru 11060AA360
Transmission Cooling. Rear. Without hybrid, upper. Forester. 2.0L. Impreza. WRX. Off water pipe. Crosstrek.
$14.56
MSRP $20.92
Save $6.36
30.4% Off
800606980 - : Pulley Bolt for Subaru Image

Pulley Bolt

Subaru 800606980
2.4L turbo. 2.5L without turbo, 2011-13. 2.5L without turbo, 2013-14. 2.0L hybrid. With hybrid.
$0.42
MSRP $0.72
Save $0.30
41.7% Off
808206210 - : Water Pump Bolt for Subaru Image

Water Pump Bolt

Subaru 808206210
2.5L, thermostat. 2.4L turbo. 2.5L without turbo.
$0.65
MSRP $1.12
Save $0.47
42% Off
808206180 - : By-Pass Pipe Mount Bolt for Subaru Image

By-Pass Pipe Mount Bolt

Subaru 808206180
2.5L, thermostat. 2.4L turbo. 2.5L without turbo, 2013-14.
$0.60
MSRP $1.04
Save $0.44
42.3% Off

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Why Choose OEM Subaru Ascent Thermostats?

OEM Fitment – Designed for factory specifications to ensure precise temperature control. 

Prevents Overheating & Cold Running – Maintains consistent engine temperature for peak performance. 

Durable Construction – Made from stainless steel and corrosion-resistant materials for longevity. 

Efficient Cooling System Operation – Ensures proper coolant flow and engine protection

Easy Installation – Direct bolt-on replacement with no modifications required.

Compatible Subaru Models

These OEM thermostats are engineered for various Subaru Ascent models, ensuring perfect fitment and reliable cooling performance:

  • Subaru Ascent (2019–2024)

Before purchasing, check your vehicle’s engine specifications to select the correct thermostat rating and fitment.

How to Install a Subaru Ascent Thermostat

A properly functioning thermostat is crucial for engine cooling and efficiency. Follow this step-by-step guide for proper installation.

Tools Required:

✔ Jack and jack stands 

✔ Socket wrench set 

✔ Coolant drain pan 

✔ Gasket scraper or sealant 

✔ Torque wrench 

✔ Fresh coolant

Step-by-Step Installation Guide:

  1. Drain the Coolant – Place a drain pan under the radiator and drain coolant to prevent spills.

  2. Locate the Thermostat Housing – Typically near the engine block, connected to the upper radiator hose.

  3. Remove the Old Thermostat – Use a socket wrench to loosen the housing bolts and remove the old thermostat.

  4. Clean the Mounting Surface – Remove old gasket material or debris to ensure a proper seal.

  5. Install the New Thermostat – Insert the new thermostat in the correct orientation (spring facing the engine), then secure the housing.

  6. Refill Coolant & Bleed Air – Refill the cooling system with fresh coolant, run the engine, and check for leaks.

Pro Tip: If you’re using a low-temperature thermostat, it can help maintain cooler operating temperatures in performance applications.

Signs You Need to Replace Your Subaru Ascent Thermostat

🚙 Engine overheating or running too cold

🚙 Temperature gauge fluctuates unexpectedly

🚙 Coolant leaks near the thermostat housing

🚙 Check engine light due to cooling system issues

🚙 Reduced fuel efficiency caused by incorrect temperature regulation.

If you experience these symptoms, replacing the thermostat prevents costly engine damage and ensures smooth operation.

Types of Subaru Ascent Thermostats

🔹 OEM Replacement Thermostats – Best for factory cooling performance, ensuring stable engine temperature regulation

🔹 Low-Temperature Thermostats – Ideal for performance applications, keeping engine temperatures lower for better power output

🔹 High-Flow Thermostats – Improves coolant circulation, ensuring efficient heat dissipation under extreme conditions.

Choosing the right thermostat ensures efficient engine cooling and longevity.

Popular Related Parts for Subaru Ascent

🔹 Subaru Ascent Radiators – Maintain maximum cooling efficiency with OEM and performance radiators. 

🔹 Subaru Ascent Water Pumps – Ensure proper coolant circulation for reliable engine cooling. 

🔹 Subaru Ascent Cooling Fans – Improve airflow and enhance cooling system performance.

Get Your Subaru Ascent Thermostat Today!

Ensure optimal engine cooling performance and prevent overheating with a high-quality OEM Subaru Ascent thermostat. Browse the selection and find the right fit for your Subaru Ascent today!

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FAQs About Subaru Ascent Thermostats

❓ How often should I replace my Subaru Ascent thermostat? Most thermostats last 60,000–100,000 miles, but regular inspections help prevent overheating issues.

❓ What temperature thermostat is best for performance applications? For high-performance setups, a 160°F–180°F thermostat helps keep engine temperatures lower.

❓ Can I replace my Subaru Ascent thermostat myself? Yes! With basic tools, most DIY mechanics can replace a thermostat in under an hour. Just ensure you bleed air from the cooling system after installation.

❓ Do I need to flush my coolant when replacing a thermostat? Yes, it's recommended to drain and replace coolant to maintain optimal cooling system performance.

❓ What happens if I drive with a faulty thermostat? A bad thermostat can cause engine overheating, poor fuel economy, and long-term engine damage.