bad car thermostat symptoms

Bad Car Thermostat Symptoms

The engine of an automobile is the most expensive to fix.  A 4-cylinder engine running at 2,000 rpm has 15 explosions per second in each cylinder. This generates a great deal of heat. The thermostat needs to be in perfect working order for the engine to run efficiently. Any of these six signs of a faulty thermostat indicate that you should have your car serviced right away.

bad car thermostat symptoms

In the long run, irreparable engine damage might be avoided by changing a thermostat in a timely manner. Well, in this article, we’ll uncover some most common, unknown symptoms of a bad car thermostat. In addition, we’ll look at the most common causes of a bad car thermostat, how often should you replace itit, and the replacement cost for it. So, let’s dive in!


Bad Car Thermostat Symptoms

The following are the most common bad car thermostat symptoms:

  • Strange Engine Noises
  • An abnormally high-temperature reading
  • A coolant leak
  • Build-Up of Deposits & Rust
  • Engine Not Working Properly

Strange Engine Noises

As your car’s engine starts to overheat, a broken thermostat may also prevent coolant from flowing, which can result in rumbling sounds. Your engine or radiator may make noises like knocking, boiling, rumbling, or gurgling. In this situation, speak with a mechanic right away.

An abnormally high-temperature reading

The engine of a car may overheat for a number of causes, including a cooling system leak, a blocked cooling system conduit, or a broken thermostat. To let the right amount of coolant into the engine, the thermostat opens and closes. The engine will overheat because the flow of coolant will be interrupted by a faulty thermostat that is stuck in the closed position. If the temperature gauge on your automobile displays an extremely high value, the thermostat may be malfunctioning.

A coolant leak

If your thermostat is installed incorrectly, it won’t work. Reinstall your thermostat if you notice coolant leaking on or around the mounting surface of your car. If the thermostat is brand-new, you might consider hiring a technician to reinstall it. If not, you might need to get the thermostat replaced.

Build-Up of Deposits & Rust

It helps to have some experience with your car’s engine to recognize this symptom. When inspecting the engine cooling system of your car, if you see that the thermostat is rusty or blocked, your thermostat may soon fail.

To prevent harm to the engine, replace the thermostat if it is rusted or clogged. By using the right coolant for your automobile, you can keep the cooling system from getting damaged and extend the life of the thermostat.

Engine Not Working Properly

The thermostat may not be preventing coolant admission to your engine if your car’s engine is operating at a lesser capacity than typical. Possible thermostat jam in the open position. The engine may be receiving too much coolant, causing the temperature to be much lower than necessary. In this situation, be sure to have your thermostat inspected for damage.

What causes a bad car thermostat?

A bad car thermostat can be brought on by a variety of factors, including a broken water pump, a slack water pump belt, a cooling system leak, a collapsed radiator line, and a clogged and failing radiator.

How often should you replace your car thermostat?

The radiator in an automobile won’t always quit functioning. However, after ten years, the majority of automotive specialists advise replacing your car thermostat. But this is an optimistic figure. A decade is not the average time that a thermostat will stop working. Harsh weather, severe driving, and defective engine or thermostat parts are a few causes of an early thermostat failure.

If the thermostat develops a problem, you should either have it checked out or have it replaced as soon as possible. Unchecked thermostat failure can rapidly cause engine overheating, lowering engine quality and efficiency. In order to increase the lifespan of car parts, maintenance programs must be established.

How much does a car thermostat cost?

Depending on the automobile model and labor expenses, replacing a thermostat typically costs between $70 and $450. A thermostat typically costs $20 to $50, while a workshop’s labor charges range from $50 to $400. It may not be possible to replace the thermostat alone in some vehicles since the thermostat is integrated into the entire housing.

The part may become highly pricey as a result. On certain automobiles, the thermostat is installed very poorly and needs to be replaced by a professional, but on other cars, you can do it yourself in only ten minutes. To find out how much labor is required to replace the thermostat on your particular car model, consult a repair manual.

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What happens when a car thermostat goes bad?

The most typical symptom of a bad thermostat is overheating. Your car’s thermostat may become stuck in the closed position as a result of corrosion or aging. If this occurs, the engine may overheat, resulting in serious damage, because the thermostat will prevent the coolant from getting to the radiator.

Does thermostat affect fuel consumption?

Yes, the engine will struggle to reach its ideal operating temperature if the thermostat is stuck open. The engine computer increases fuel delivery while it is cold to speed up warming. Therefore, low mileage will undoubtedly result from a stuck open thermostat.

Can a car run with a bad thermostat?

Overheating is imminent if a thermostat has failed to the “closed” position. Driving a car in this condition can quickly cause serious engine damage, so it should never be done.

How do I know if my water pump or thermostat is bad?

Coolant leakage, an overheated engine, engine whining, and steam flowing from the radiator are typical symptoms of a faulty water pump.

Can a bad thermostat affect car AC?

The thermostat should not have an impact on the air conditioner’s compressor. By opening and closing at particular temperatures, the thermostat regulates the coolant flow in your car’s engine and controls when the coolant flows into and out of the motor from the radiator.

Does the thermostat affect the engine?

The thermostat in an automobile is in charge of managing the coolant flow in the engine. It also enables the engine to keep the temperature of a car constant regardless of the weather. If this straightforward component malfunctions, your car’s performance could suffer significantly. Additionally, it may eventually cause serious engine damage.

Take Away

Keep a watch out for these symptoms that a car thermostat is failing. Get your car checked out by a professional right away if you notice any of these symptoms. Damage to thermostats is almost unavoidable, thus it is a good idea to get yours updated when you repair your automobile on a regular basis.

That is all for this article on bad car thermostat symptoms, in which we listed and discussed the following symptoms:

  • Strange Engine Noises
  • An abnormally high-temperature reading
  • A coolant leak
  • Build-Up of Deposits & Rust
  • Engine Not Working Properly

Hope it really helps. If so, kindly share it with others. Thanks for reading; see you around!


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