How To Clean Expansion Valve


The expansion valve is one of the most important parts in your water heater. It regulates how much heat your water gets as it enters the tank. Too much heat can cause your water to boil, which could potentially hurt your skin or even start a fire!

The expansion valve works by letting some of the hot liquid enter a cold chamber, where both become cool. This process happens very quickly (1-2 seconds per turn of the knob), so it does not require much energy. As such, the expansion valve is typically a good choice when using a low temperature source of water, like snow or distilled water.

It is crucial that you check your expansion valve frequently to make sure it is working properly. If it seems slow in cooling down or taking too long to do its job, then you should change it. An experienced technician will be able to tell if yours is no longer functioning correctly just from looking at it.

Wipe down the valve with a clean, lint-free cloth

how to clean expansion valve

The second way to make sure your dryer works well is by wiping off any sticking or dirty residue that could prevent it from spinning up. After cleaning the expansion sleeve, wipe it down using a soft, lint free cloth.

This will also wash off any burnt hair or other material that may have dried in the machine.

Use a damp cloth to wipe down the valve

how to clean expansion valve

After you have cleaned your expansion tank through the top, now it is time to clean it via the back side. The back side can also be accessed by taking off the cap or holding onto the plastic handle and twisting it up or down, just make sure not to pull out too much!

When cleaning this part, use a soft dry brush or paper towel to remove any buildup. Make sure to completely wash away all of the water so that nothing gets trapped in the foam. This could cause damage to the engine!

Never pour liquid cleaners directly into the tank as this may create an overflow which could start leaking fluid from elsewhere in the car.

Run some water through the valve to wet it

how to clean expansion valve

The next step is to run some water through the expansion hole or venting area of the valve. This was suggested in your user manual, but many people forget this step!

Running very hot water can cause the gasket to melt, letting moisture get into the system. If there’s any dried up foam around the mouthpiece, also remove that as it could prevent proper air intake.

After running the water, wait a few minutes and check if the gas has cleared out completely. If it has, then you are done! Make sure to save the empty bottle for future use.

Removing ketchup or other gross food residues may require using a paper towel to soak up excess liquid first before cleaning the valve.

Lubricate the valve with oil

how to clean expansion valve

While changing your brake fluid, make sure you lube the expansion valve first! This is an important step as it helps facilitate better hydraulic communication in the system.

By lubricating the valve first, you are giving your car’s engine some extra help when bringing the vehicle back down from its top speed or stopping it completely.

This will also prevent any dry spots in the system that could potentially cause poor performance or even damage the valves themselves. Make sure to apply just enough oil so that you can see a drop of liquid dripping off of it but not too much, otherwise you may accidentally pour too much into the reservoir!

Removing old brake fluid is equally important since it can contain contaminants such as lead which can be harmful to your engine. If there is no way to easily remove the old fluid, then do not worry about it! Simply buy new brake fluid and refresh the mechanic’s opinion if necessary.

Gently push and pull the valve to make sure it’s not binding

how to clean expansion valve

The last thing you want is for your dryer to burn out due to an obstruction in the drying cycle. This happens when the drum gets very hot which causes the fabric to stick or tangle around the drum rollers.

When your dryer detects that there are no more towels in the tub, it switches into start-up mode to determine what kind of clothing item comes next. At this stage, the expansion valve works as intended and regulates how much heat the drum receives so that it can recognize what type of cloth to tumble down.

If you happen to find that the dryer takes longer than usual to work its way through all of the settings, then changing the expansion valve may be necessary. However, don’t worry! We have tips here for you.

Use a clean, compressed paper towel to wipe the valve down

how to clean expansion valve

The second part of this process is using a cleaned up expansion tank. This can be done by either draining the water out or having someone else do it for you.

After that, make sure the hose connecting the car to the tank is removed as well! Once both are clear, pull the handle located at the top of the tank to open it up.

Now, use your new clean cloth to wipe down the sides of the tank. Make sure to get all around the rubber washer that seals the liquid in the tank. Wipe away any residue or dirt that may have made its way into the tank.

Once everything looks good, close up the lid and leave it alone until you can take it home.

Let the valve dry completely

how to clean expansion valve

After you have cleaned your car’s expansion tank, let it air-dry before proceeding with any other steps. Make sure to check both doors of the tank for cracks or moisture!

This is very important as water can seep out from there and prevent the tank from fully expanding. By having it air-dry, it will eventually seal properly and retain more fuel.

Make sure to also run an additional test to make sure that the gas has stopped flowing through the filler pipe! This ensures that none of the fluid got sucked in another area of the vehicle due to the leak.

Re-lubricate the valve

how to clean expansion valve

After making sure your car is safe to drive, you can now re-lube the expansion valve! This will ensure that your engine does not suffer from low tank pressure due to dry running.

To do this, turn off your vehicle and pull the cord located next to the gas pedal. You may have to use both hands to do so. Once it is pulled, run some cool water over the nozzle for at least five minutes.

After this time has passed, remove the plastic cover by pulling up or down on the top of the device. Then, take a good amount of spray lubricant and spread it all around the intake tube.

Now, close the lid back onto the device and start the engine again! Make sure to keep checking the pressure until it reaches what it should be.

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