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Car Only Leaks Coolant When Turned Off

by

Jeffrey
July 6, 2022
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There are a lot of car owners out there who have experienced this issue at one point or another – their car only leaks coolant when it is turned off.

So, what could be the cause of this problem?

Is there anything that can be done to prevent it from happening?

In this article, we will explore some of the potential causes of this issue and offer some solutions that might help you fix it.

But before we get into the topic, let us have some basic understanding of antifreeze.

What Is Antifreeze?

Antifreeze is a substance that is added to the water in your car’s cooling system in order to lower its freezing point.

This is important because, without antifreeze, the water in your car’s cooling system could freeze during cold weather and cause the engine to overheat.

In addition to lowering the freezing point of water, antifreeze also raises its boiling point.

This is important because it prevents the water in your car’s cooling system from boiling over and causing the engine to overheat.

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How To Know If Car Is Leaking Coolant?

The most obvious sign that your car is leaking coolant is when you see a pool of green, yellow, or orange liquid beneath your car.

If you suspect that your car might be leaking coolant, but you’re not sure, there are a few other signs to look for:

  1. The “check engine” or “temperature” light on your car’s dashboard is lit up. This might happen when the car is overheating.
  2. Your car’s engine is overheating.
  3. There is steam coming from under the hood of your car.
  4. Your car’s heater isn’t working as well as it used to.
  5. Your car’s windshield is fogging up more than usual.

If you notice any of these signs, it is important to have your car checked by a mechanic as soon as possible.

Car Only Leaks Coolant When Turned Off (Reasons)

There are a few potential causes of this problem:

1. Crack In The Radiator

A crack in the radiator is one of the most common causes of this problem.

When the car is turned off and the coolant stops circulating, the pressure inside the cooling system decreases.

This can cause a small crack in the radiator to expand and leak coolant.

To fix this problem, you will need to have the radiator repaired or replaced.

If you have a crack in your radiator, it is important to have it repaired or replaced as soon as possible.

2. Loose or Damaged Radiator Cap

Another potential cause of this problem is a loose or damaged radiator cap.

The radiator cap is what keeps the coolant from leaking out of the cooling system.

If the radiator cap is loose, it can allow coolant to leak out when the car is turned off.

This can also result in the vibration of your car.

3. Leak In The Coolant Hose

If there is a leak in the coolant hose, it can cause the car to leak coolant when it is turned off.

This is because, when the car is turned off and the coolant stops circulating, the pressure inside the cooling system decreases.

This can cause a small leak in the hose to expand and leak coolant.

4. Problem With The Water Pump

If there is a problem with the water pump, it can cause the car to leak coolant when it is turned off.

The water pump is responsible for circulating the coolant through the cooling system.

If the water pump is not working properly, it can cause the car to leak coolant.

5. Head Gasket Leak

Head gasket leak is another common reason for car leaking coolant when turned off.

The head gasket seals the engine block and the cylinder head.

If the head gasket is damaged, it can allow coolant to leak into the engine.

To fix this problem, you will need to have the head gasket replaced.

6. Faulty Thermostat

A faulty thermostat can also cause the car to leak coolant when it is turned off.

The thermostat is responsible for regulating the temperature of the coolant.

If the thermostat is not working properly, it can cause the car to leak coolant.

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7. Overheating

If the car is overheating, it can cause the car to leak coolant when it is turned off.

This is because, when the car is overheating, the coolant expands and can leak out of the cooling system.

8. Pressure Buildup

If there is too much pressure in the cooling system, it can cause the car to leak coolant when it is turned off.

This is because, when the car is turned off and the coolant stops circulating, the pressure inside the cooling system decreases.

This can cause the coolant to leak out of the cooling system.

Tips To Prevent Coolant Leaks When Turned Off

There are a few things you can do to prevent your car from leaking coolant when it is turned off:

  1. Check the level of coolant in the radiator regularly. If it is low, add more coolant.
  2. Check the radiator cap regularly. Make sure it is tight and not damaged.
  3. Inspect the coolant hoses regularly. Make sure they are not damaged and are properly connected.
  4. Check the water pump regularly. Make sure it is working properly.
  5. Inspect the head gasket regularly. Make sure it is not damaged.
  6. Check the thermostat regularly. Make sure it is working properly.
  7. Do not overheat the car.
  8. Do not add too much pressure to the cooling system.

If you follow these tips, you can prevent your car from leaking coolant when it is turned off.

Conclusion

There are a few potential causes of car leaking coolant when turned off.

The most common cause is a radiator leak.

Other potential causes include a loose or damaged radiator cap, a leak in the coolant hose, a problem with the water pump, and a head gasket leak.

To prevent this from happening, you should check the level of coolant in the radiator regularly, check the radiator cap, and inspect the coolant hoses.

You should also check the water pump, head gasket, and thermostat regularly.

Do not overheat the car or add too much pressure to the cooling system.

Follow these tips and you can prevent your car from leaking coolant when it is turned off.

Do you have any other tips to prevent a car from leaking coolant when turned off?

Share your tips in the comments below!

Jeffrey

Jeffrey Bryce is an experienced motorcycle rider with years of experience caring for motorcycles. His natural fondness for motorcycles have made him come up with LetsGoForARide.com, which is dedicated to answering and teaching you how to care for your bike with the care it requires. LetsGoForARide is the one of his important lifework in reaching out to communities of motorcycle enthusiasts on how to take care of their bike and choosing the correct spare part.