How to Flush a Heater Core (Fast)

Is your heat not working or is your heater not hot? You may have a clogged heater core so do a heater core flush and unclog it. Learn how to flush your heater core and get it working to full capacity again instead of spending hundreds on a replacement!

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Disclaimer:
Due to factors beyond the control of ChrisFix, I cannot guarantee against improper use or unauthorized modifications of this information. ChrisFix assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. Use this information at your own risk. ChrisFix recommends safe practices when working on vehicles and or with tools seen or implied in this video. Due to factors beyond the control of ChrisFix, no information contained in this video shall create any expressed or implied warranty or guarantee of any particular result. Any injury, damage, or loss that may result from improper use of these tools, equipment, or from the information contained in this video is the sole responsibility of the user and not ChrisFix.

[adolfomonrreal]

This video was made 7 years ago and Chris is still responding to messages. legend

[exhale.]

Can't imagine you'll see this comment, but followed this guidance over the weekend and brought my 20 year old heater from nonfunctional to hot as an oven. Took about 30 gallons and a lot of sediment that looked like pebbles of concrete. The weather is below freezing most mornings now and I'm super appreciative- you've changed my quality of life significantly.

[planetrob]

2014 "hey guys..."
2019 "HEY GUYS!!!..."

[kimberly]

Thank you, Chris. Since my Husband has passed I have to do this by myself. Because of you and your detailed instructions, I got the job done all by myself! Actually, it was pretty simple. P.S.: I have a 2000 Dodge Dakota w/V-8 MAGNUM.

[averylefor]

I bet Chris's vehicles will run forever. He replaces thing that people don't even know exist.

[eathanrichards]

Have i watched this 2 times. YUP! Do i need to do this. NOPE!

[Tom-wqmz]

I've been working on automobiles for over 35 long year's and I love watching your videos. Your a very smart kid

[keykneedeep]

When putting your hose back in - always push it to the base. ALWAYS GENTLEMEN

[huntergman]

"it tastes sweet and will kill them."

Peta, "write the down, write that down!"

[StevesRealWorld]

Chris you are a Genius!! My vent temps went from 88'f to 148'f after doing the heater core flush!!! Can't believe what a difference this made!!

[davidhur]

my relationship so broken not even chris can fix it =(

[kristopherdrolet]

ChrisFix has been saving me thousands of dollars, this guy should get a nobel prize. I have a 2013 dodge Ram 1500 and I had no more heat on driver's side. I went at the dealer and they told me it could be multiple problems and would cost around 2000$ to fix. Decided to try this first and it worked like a charm, simple steps and only cost me 35$. Thank you so much Chris!

[MARTYMEINEKE]

Pro tip never disconnect the heater hose from the heater core itself. Disconnect them from the engine. Reason being the hoses may have to be twisted loose for removal and if you snap the neck of the heater core you are in for a big repair. So remove them on the engine or coolant feed instead

[aliennotion]

Chris costs me a fortune fixing stuff I didn't even know needed fixing.

[ODog-]

Chris you’re a life saver, this was my first time doing maintenance on my own and thanks to you I have nice hot heat in my car again 😁

[TrueBlueEG]

Word to the wise, if you try removing the hoses from your 20 year old heater rad, you will run into serious trouble. My advice is to buy new hose before you attempt this, and cut the old hoses off with a sharp stanley knife, dont pry or twist them off, because you will distort the metal pipes on the heater core, or break the welds/braising inside the car and fill your interior with delicious coolant, I have seen this happen several times on older cars.

[joehorstthemechanic-lagran]

Pretty good video but just a couple of cautions. You want to be very careful when removing the heater hoses from the heater core, if you have an older heater core and you twist the hoses to remove them, it can damage the heater core and then you have no choice but to replace it. Most often we put a short slice at the end of the hose and work it off carefully then cut the slice off the end of the hose and reinstall it after flushing. When those spring clamps are removed they lose spring tension, I have seen them leak when reused. We always install new screw style clamps. Otherwise the video was very informative and flushing does help heater output most of the time.

[Motley-Croo]

Thank you for teaching me that working on cars doesn’t have to be scary, I started watching before I could drive and now I’m pursuing mechanical engineering. I’ve come a long way thanks to you! ❤

[MusangLaut]

I live near the equator, why am i watching this

[geopars]

Flush it both directions. Always. And flushing the whole coolant system is highly recommended. Flushing the heater core and not the block, radiator is pointless