How do I know if my Subaru Outback thermostat is bad?
The thermostat in your Subaru Outback plays a crucial role in regulating the engine's temperature. If it fails, it can lead to overheating or underheating, both of which can cause significant damage to your vehicle. In this article, we’ll explore the common signs of a bad thermostat, why it’s important to address the issue promptly, and what steps you can take to fix it.
Signs of a Bad Thermostat in Your Subaru Outback
A malfunctioning thermostat can manifest in several ways. Here are the most common symptoms to watch out for:
- Engine Overheating: If the thermostat is stuck closed, coolant cannot flow to the radiator, causing the engine to overheat. You may notice the temperature gauge climbing into the red zone.
- Engine Running Too Cool: A thermostat stuck open will allow coolant to flow continuously, preventing the engine from reaching its optimal operating temperature. This can lead to poor fuel efficiency and reduced performance.
- Fluctuating Temperature Gauge: If the thermostat is failing intermittently, you might see the temperature gauge moving erratically.
- Coolant Leaks: A faulty thermostat can cause pressure buildup in the cooling system, leading to leaks around the thermostat housing or other components.
- Heater Not Working Properly: If the engine isn’t warming up due to a stuck-open thermostat, the cabin heater may blow cold air instead of warm.
Why Addressing a Bad Thermostat Is Important
Ignoring a faulty thermostat can lead to severe engine damage. Overheating can warp the cylinder head, damage the head gasket, or even cause the engine to seize. On the other hand, an engine running too cool can lead to increased wear and tear, as well as higher emissions. Promptly diagnosing and replacing a bad thermostat can save you from costly repairs down the road.
How to Diagnose and Fix a Bad Thermostat
If you suspect your Subaru Outback’s thermostat is failing, follow these steps to confirm the issue and address it:
- Check the Temperature Gauge: Start your car and monitor the temperature gauge. If it climbs too high or stays too low, it’s a sign of a thermostat issue.
- Inspect for Coolant Leaks: Look for any visible leaks around the thermostat housing or other parts of the cooling system.
- Feel the Radiator Hoses: After the engine has warmed up, carefully feel the upper and lower radiator hoses. If one is hot and the other is cold, the thermostat may be stuck closed.
- Replace the Thermostat: If you’ve confirmed the thermostat is the problem, it’s time to replace it. This involves draining the coolant, removing the thermostat housing, replacing the thermostat, and refilling the coolant. If you’re not comfortable doing this yourself, it’s best to take your car to a trusted mechanic.
When to Seek Professional Help
While replacing a thermostat is a relatively straightforward task for experienced DIYers, it can be challenging if you’re unfamiliar with your vehicle’s cooling system. At Kevin’s Autos, we specialize in diagnosing and repairing cooling system issues, including thermostat replacements. If you’re in doubt or need assistance, don’t hesitate to reach out to us for professional service.
Remember, a healthy thermostat is essential for keeping your Subaru Outback running smoothly. Don’t ignore the warning signs—address the issue promptly to ensure your vehicle stays in top condition.
Frequently Asked Questions
How do I know if my thermostat needs replacing?
7 Telltale Signs Your Thermostat Needs Replacing
- Blank or unresponsive screen.
- Short-cycling.
- Constantly running HVAC units.
- Inaccurate thermostat temperature readings.
- Hot and cold spots.
- High energy bills.
- Old and obsolete.
How to check thermostat on Subaru Outback?
Drive the Subaru for 10 minutes or allow it to remain in 'Park' at 1,500 RPMS. While it is running this way, pop open the hood and check whether both heater hoses and upper radiator hose is at a similar temperature of 160-190 degrees.
How do I know if my Subaru Outback is overheating?
Here are some ways to detect an overheating Subaru engine.
- Your Hood Cover is Very Hot. When you run your Subaru engine, it is normal for the hood to heat up.
- Warning Light. All Subaru vehicles are fitted with a temperature gauge that monitors the state of the engine.
- Mechanical Sounds.
- Leaking Coolant.
Can you keep driving with a bad thermostat?
If you drive with a bad thermostat, your car could overheat, causing severe and expensive engine damage. And while it's technically possible to drive without a thermostat, we don't recommend it. Your car will not reach an acceptable operating temperature, resulting in higher fuel consumption and excessive engine wear.
How do I test my thermostat?
One easy thing you can do to check the accuracy of your thermostat is to do a temperature check. See what your thermostat reads. Then use a portable indoor thermometer to compare the temps. Another good way to do the temperature check is to download one of the many free apps that allow you to check indoor temperatures.
Can I drive a car with a bad thermostat?
If you drive with a bad thermostat, your car could overheat, causing severe and expensive engine damage. And while it's technically possible to drive without a thermostat, we don't recommend it. Your car will not reach an acceptable operating temperature, resulting in higher fuel consumption and excessive engine wear.
What are the symptoms of a bad thermostat?
What Are the Signs of a Bad or Broken Thermostat?
- The AC or Furnace Won't Come On.
- The HVAC System Won't Turn Off.
- The Thermostat Is Unresponsive.
- The HVAC System Short-Cycles.
- The Room Temperature Doesn't Match the Thermostat Setting.
- The Programmed Settings Reset Themselves.
- Check and Adjust the Settings.
Do subarus have two thermostats?
And you got this little itty bitty baby one what's that about well modern subarus. Again most of them not all of them. Have two thermostats. One is for your engine coolant. And one is for your cvt.
How do I manually test my thermostat?
Standard thermostats: Enlist a friend or family member to assist, Position one person by the thermostat and one person by the furnace. Slowly turn the thermostat from off to heat and increase the temperature. Both the thermostat and furnace should make a sound.
How long does Subaru thermostat last?
A car thermostat is designed to last a long time – typically around 100,000 miles or 10 years. However, various factors can impact its lifespan. First, driving conditions play a role. If you regularly drive in hot weather or stop-and-go traffic, your thermostat may suffer additional stress.
