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How to unload a heater core: a step by step guide from this web.com

doYour car heater is not working properly? This could be due to a blockage in the heater core. Don’t worry, you can perform a heater core flush at home with the right equipment and the right techniques. Here is our detailed guide on how to wash a heater core. Use this to unclog your heater core with no problem.

How to unload a heater core: a step by step guide from this web.com - 1 - August 26, 2022

Before we delve into how to unclog a heater core, let’s first understand what a heater core is and what it does.

What is a heater core?

A heater core is a device that heats the cabin of a car. It uses the heat from the coolant and heats the interior of the vehicle. So when a heater core is clogged, it prevents coolant from passing through it. Therefore, the amount of heat transferred to the cabin also decreases. This is where a heater core flush can help.

Now let’s dive into the important part.

How to unload a heater core: a step by step guide from this web.com - 3 - August 26, 2022

How to flush the core of a heater?

things you will need

  • Bucket
  • Garden hose
  • Container
  • Screwdriver
  • Scotch tape
  • coolant water mixture

Step 1

The first step is to identify the heater core inlet and outlet hoses. It is usually found on the firewall of cars. However, the location may vary depending on the vehicle. So if you’re having trouble locating them, check your vehicle’s owner’s manual.

Step 2

Next, disconnect the heater hoses. Use a screwdriver to loosen the hose clamps. When disconnecting the hoses, water and coolant can leak out. Therefore, place a container under the hoses and point the inlet hose towards the container.

Step 3

To clear the blockage, you must blow water or air through the heater core. Doing so will flush the grime and debris causing the clog out of the inlet hose. Now insert a water hose into the outlet hose. If you have access to an air compressor, you can use it to blow out coolant and dirt. Use a seal or adhesive tape to firmly connect the outlet and the hose.

Step 4

After sealing the outlet well, turn on the water. If you are using an air compressor, turn it on. After a while, the remaining coolant, water, and dirt will flow through the inlet hose into the container. Let the water flow for a few minutes to clear the clog. Shut off the water and allow the system to drain.

step 5

Reconnect the hoses to the system and reattach the clamps. Make sure the connections are tight. Now, it’s time to refill the cooling system. Open the radiator cap and fill it with a 50/50 mix of water and coolant, or you can use a premixed coolant that is readily available.

Step 6

Go out for a spin to test the system. Turn on the fire to the maximum level. After a while, warm air should come out of the vents. Finally, check for any leaks in the hoses.

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