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How To Bleed A Cooling System

If your car has a cooling system, then you know it’s important to keep it functioning properly. A malfunctioning system can lead to overheating, loss of power and even a fire. In this blog post, we’re going to teach you how to bleed a cooling system—a necessary step when it comes time to repair or replace it. Bleeding a cooling system is not difficult, and it can save you a lot of trouble in the long run. By following our tips, you’ll be able to get your car back on the road as quickly as possible. So don’t hesitate—get started on bleeding your cooling system today!

What is a cooling system?

A cooling system is responsible for moving heat away from your vehicle’s engine and interior. A broken or malfunctioning cooling system can lead to overheating, poor performance, and even a fire. Here are four steps you can take to bleed a cooling system:

1. Park the car in a cool place. A garage or outdoors in the shade will work best.
2. Turn off the engine and remove the key from the ignition.
3. Open the hood and get ready to drain the radiator reservoir.
4. Disconnect both hoses from the radiator by twisting them 180 degrees counterclockwise (If one hose has a “C” on it and the other does not, twist that hose instead). Make sure all air bubbles have been removed from each end of each hose before reconnecting them.

How does a cooling system work?

A cooling system consists of a thermostat, radiator, fan, and hoses. When the thermostat senses that the outside temperature is too high, it sends a signal to the fan to turn on. The fan then starts circulating air through the radiator and through the hoses, which cools the engine. If you have a water pump driven by an engine-driven belt, you may also have an expansion valve that helps keep engine coolant at a consistent temperature.

What are the symptoms of a failing cooling system?

A cooling system is designed to keep a car or truck’s engine and drivetrain cool, but if it fails, the consequences can be dire. Here are the most common symptoms of a failing cooling system:

* A “knocking” noise coming from the engine or transmission

* A raw, sour smell coming from the car or truck

* Low oil pressure

* High temperatures inside the engine or transmission

How can I bleed my cooling system?

Bleeding your cooling system is a simple way to get rid of trapped air or water in the system. To bleed the coolant, you will need some anti-freeze, a hose, and a bucket. Pour about an inch of anti-freeze into the bucket. Put the end of the hose into the coolant and turn on the faucet until the coolant bleeds into the bucket. Once all of the fluid has been drained from the hose, put it away and tighten any loose connections.


Bleeding a cooling system can be a tricky task, but with the right knowledge and tools it can be handled with ease. Before you get started, make sure that you have all of the necessary supplies on hand: a container for the coolant, a clean cloth or paper towel to absorb the liquid, and some boiling water to help dissolve any impurities in the coolant. Next, start by pouring enough boiling water into your container to cover the part of the system you are trying to bleed. Then place your cloth or paper towel over the top of the pot and wait 30 minutes. After 30 minutes has passed, remove the cloth or paper towel and pour off any remaining coolant. Finally, wash your hands thoroughly after completing this process.