How do I know if my Subaru OutBack thermostat is bad?
If your Subaru Outback's engine is running hotter or colder than normal, it could be a sign that the thermostat is malfunctioning. The thermostat plays a crucial role in regulating the engine's temperature, and a faulty one can lead to various issues. In this article, we'll explore the signs of a bad thermostat and provide steps to diagnose and replace it if necessary.
Signs of a Bad Thermostat
Here are some common indicators that your Subaru Outback's thermostat may be failing:
- Overheating engine: If your engine is running significantly hotter than normal, it could be a sign that the thermostat is stuck in the closed position, preventing coolant from circulating properly.
- Slow engine warm-up: If it takes an unusually long time for your engine to reach its normal operating temperature, the thermostat may be stuck in the open position, allowing coolant to circulate too freely.
- Fluctuating temperature gauge: If the temperature gauge on your dashboard is constantly fluctuating, it could indicate a problem with the thermostat.
- Coolant leaks: A faulty thermostat can cause coolant to leak, as the seal between the thermostat housing and the engine block may be compromised.
If you notice any of these symptoms, it's essential to have your Subaru Outback's thermostat inspected and replaced if necessary.
Diagnosing a Bad Thermostat
To determine if your Subaru Outback's thermostat is the culprit, you can perform a few simple tests:
- Visual inspection: Examine the thermostat housing for any signs of leaks or damage. If the housing is cracked or the thermostat appears stuck in the open or closed position, it's likely time for a replacement.li>
- Temperature test: Use a digital thermometer to measure the temperature of the coolant before and after the thermostat. If the temperature difference is less than 40°F, the thermostat may be stuck open. If the temperature difference is more than 70°F, the thermostat may be stuck closed.li>
- Thermostat removal and testing: Physically remove the thermostat and place it in a container of hot water. Observe if the thermostat opens and closes as the water temperature changes. If it doesn't, the thermostat needs to be replaced.li>
If the tests confirm that the thermostat is malfunctioning, it's time to replace it with a new one.
Replacing the Thermostat
Replacing the thermostat in your Subaru Outback is a relatively straightforward process, but it's important to follow the manufacturer's instructions carefully. Here are the general steps:
- Locate the thermostat housing, typically near the top of the engine.
- Drain the coolant from the system, being careful to avoid spills.
- Remove the thermostat housing and the old thermostat.
- Clean the housing and engine block mating surfaces to ensure a proper seal.
- Install the new thermostat, making sure it's oriented correctly.
- Reassemble the housing and refill the coolant system.
- Start the engine and check for any leaks or temperature issues.
By following these steps and being attentive to the signs of a bad thermostat, you can help ensure your Subaru Outback's engine runs at the optimal temperature and avoid more serious issues down the road.
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.
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.
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.
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.
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.
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.
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.
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 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.
