Come along with Eric O. at the SMA shop as we diagnose and repair this 2013 Ram 3500 Cummins that came in with a complaint of no heat out of the dash vents. We diagnosis it as a restricted heater core and show you how we flush them out in the shop.
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49 thoughts on “Flushing a heater core”
  1. Avataaar/Circle Created with python_avatars Sean McGuirk says:

    "Not a rocket surgeon"
    Ricky Ricardo would be proud!

  2. Avataaar/Circle Created with python_avatars Dave Brosius says:

    Same exact truck, same problem as I have

  3. Avataaar/Circle Created with python_avatars Roger Sweeney says:

    I did this on a 2008 Lexus. A head gasket sealer was used some time ago. I belive sludge buildup thank to the driver's side of the heater core. Passenger side had heat but the driver-side did not. So, I used a small 4-7 pounds of pressure water pump to circulate CLR from a 5 gallon bucket and back to the 5-gallon bucket. I let it run 2 hours. That fixed the heater core.

    Also, I would like to know where you got the nozzle sometimes that combines water hose water with are on the bottom of the handle?

  4. Avataaar/Circle Created with python_avatars Arturp Montesdeoca says:

    O

  5. Avataaar/Circle Created with python_avatars Antonio Claudio Michael says:

    That's your problem lady Ya Heater Core was plugged Good video Eric O as Always @SouthMainAutoRepairLLC

  6. Avataaar/Circle Created with python_avatars Scott Hart says:

    Dude I see everyone showing a garden hose and tap water, but I was also told no on the tap water because it introduces minerals into the system! Is there a process afterwards? Should you do a distilled water flush? Got a 2007 GL450 and there’s ANOTHER heater core in the rear…. It’s inside a panel in the cargo area… I wonder how I would this….

  7. Avataaar/Circle Created with python_avatars Chris Leeper says:

    I just bought the otc blast gun, what psi should you run through it.

  8. Avataaar/Circle Created with python_avatars surendra bullets says:

    🙏👍

  9. Avataaar/Circle Created with python_avatars surendra bullets says:

    Chances of breaking the pipe,,, follow the other processes,,like coolent box vent cover loose to gas release ,but carefully,, slowly slowly anti clockwise ,,,and use citric acid or vinegar with salt,,

  10. Avataaar/Circle Created with python_avatars Quagmire Davis says:

    Where is this shop located?

  11. Avataaar/Circle Created with python_avatars buffy stclair says:

    Last year did this to a ‘16 Ram 3500 with cummins, also put a small block (cardboard) in front of rad , also a plow truck, seems to have worked fine cause didnt hear back about it. Guy is my daughters bf so I see the truck alot.Recommended flushing whole system when plow season over. He talked about trading up to new truck so we didn’t do anything , also decided to not plow again. Come September he began signing up plow contracts. First cold day and snow he said it wasnt as hot again , did the quick flush , lots of sediment but only gained about 10 degrees . All along I told him I wasn’t wanting to pull the dash, im semi-retired and no equipped to do that ( maybe could have let freon out to air) so sent it to a friends shop. He just got the truck back, 3 days it took ( tires as well ) , havent heard about the heat .

  12. Avataaar/Circle Created with python_avatars Johnny Sechrist says:

    I've always put CLR In the core overnight then flush in the morning.

  13. Avataaar/Circle Created with python_avatars kubotamaniac says:

    Could a clogged heater core explain temperature difference between driver's side and passenger's side in a dual zone cabin? (2016 Ram 3500 Laramie…)

  14. Avataaar/Circle Created with python_avatars Donald Rippetoe says:

    Just wanted to send along a thank you for your video. I also ordered the OTC gun and followed the steps outlined in your video and I too have heat again! It was negative 4 here two days ago so its a good thing to have! Thank you again, deeply appreciated!

  15. Avataaar/Circle Created with python_avatars James Gerke says:

    Have a 93 k2500 5.7
    I'm pushing 115° out the vents. Other problem is my engine is not getting over 160° after 35 miles

  16. Avataaar/Circle Created with python_avatars InfidelLunchbox says:

    I told multiple shops I was having these symptoms and all my blend doors work, I get on the lowest fan setting but as soon as I go up on fan speed the air gets cooler. I even had one side ac on and driver side heat and it worked fine separating the two. Just not heat and everyone wants to charge me 2k for hvac care

  17. Avataaar/Circle Created with python_avatars Taniya Reaves says:

    New the link for tool to flush heater core

  18. Avataaar/Circle Created with python_avatars tommy gullett says:

    Flush with C L R whole bottle leave in a couple of days replace antifreeze and save a lot of money………

  19. Avataaar/Circle Created with python_avatars Morning Wood says:

    I liked your video watched it to the end , found a new tool. You got a new subscriber.

  20. Avataaar/Circle Created with python_avatars BayouBoi504 says:

    You are the man. Man I have the 2014 Ram 2500 6.7L Cummings. Up until about 30min ago I had absolutely no heat in the truck. I was lucky enough to get it done with a garden hose with a high pressure tip on it, NO airlines at all. You should've seen the clumps of calcium that came out. I could've sworn that I was going to be pulling the dash out today. So again thank you man for saving me the time and money. I thought I was going to be knee deep into a rats nest of work. To everyone watching and reading this. I highly recommend doing this, its easy, also saves time and money. It took me about 30mins tops..Thank you

  21. Avataaar/Circle Created with python_avatars Kevin Radu says:

    Hello please give me your number

  22. Avataaar/Circle Created with python_avatars TL Stanbro says:

    Next time you do a flush heater core could you possibly put the excess water in a 5 gallon bucket so we can see what comes out of the heater core Thanks

  23. Avataaar/Circle Created with python_avatars Micah Olvera says:

    Thank you. You give me the confidence to do this stuff myself!

  24. Avataaar/Circle Created with python_avatars Ed Young says:

    I bought the otc gun and followed your directions. It worked flawlessly! Thank you for the great video.

  25. Avataaar/Circle Created with python_avatars symple001 says:

    Do you need to burp your system after???

  26. Avataaar/Circle Created with python_avatars Squirrel Covers says:

    This takes 5 minutes to do with $6 worth of hose from the hardware store. A 30 minute instructional videos is a joke.

  27. Avataaar/Circle Created with python_avatars IamtheMiller says:

    Thank you! Used your link to buy the water gun.

  28. Avataaar/Circle Created with python_avatars Brad Cass says:

    IR guns use an average emissivity rating for most readings. Plastic, aluminum, steel etc all have different emissivity values and therefore the temperature would vary slightly. Thermocouples use two dissimilar metals to generate a current that is converted into a temperature value

  29. Avataaar/Circle Created with python_avatars photondebuger45 says:

    I have to change mine because it was leaking like I would see whips coming out of the dash vents wish me luck on doing that

  30. Avataaar/Circle Created with python_avatars Bill Smith says:

    When I flush a heater core I like to flush it reverse of flow first so that anything that's been pressured into blocking more easily be pushed out

  31. Avataaar/Circle Created with python_avatars Jose Maldonado says:

    Master Eric,can I run a car with out a secondary air pump out,

  32. Avataaar/Circle Created with python_avatars Hola! Craig Goodwin says:

    Eric, watched that "other" video where you used the OTC gun. Ordered one! My truck was very marginal last winter. Used the gun and came out with readings very close to yours when done. Also, the initial blast produce some rust colored water. Expect to experience a much warmer winter this year. Thanks for Sharing!

  33. Avataaar/Circle Created with python_avatars Matt Barker says:

    Same year Ram with little to no heat… and coolant smell, but no visible leak on the floor. I am leaning towards having to replace the heater core, but would love for it to be a simpler issue. Thoughts?

  34. Avataaar/Circle Created with python_avatars jsmiffyy says:

    I need a topside creeper lol. You think a diy one is possible?

  35. Avataaar/Circle Created with python_avatars Bob Smith says:

    Moral: Use pure antifreeze mixed with purified water only.

  36. Avataaar/Circle Created with python_avatars Gary R says:

    Bought a van once and the idiot previous owner dumped a bunch of stop leak in the coolant instead of actually fixing a bad hose, it plugged the heater core up pretty bad. A good flush and it worked again, I just probably got lucky it did.

  37. Avataaar/Circle Created with python_avatars Hard Truth says:

    I use a distilled white vinegar 30 minute soak to flush my heater core. Works wonderfully. Of course I throughly flush it with distilled water after the soak.

  38. Avataaar/Circle Created with python_avatars Mohammed Boland says:

    I want to buy

  39. Avataaar/Circle Created with python_avatars Frank Reichl says:

    Rocket Surgeon ? good one

  40. Avataaar/Circle Created with python_avatars Hangfire says:

    The probe is reading air temp, the infrared is reading surface temp of the vent plastic

  41. Avataaar/Circle Created with python_avatars Bill Taylor says:

    Put a water filter on it.

  42. Avataaar/Circle Created with python_avatars Sejong TheGreat says:

    IR reading can't make up difference of intake temp and difference in temp across vents.

  43. Avataaar/Circle Created with python_avatars Sejong TheGreat says:

    FFS Never reverse flush a coolant system. Coolant is meant to flow one way. When you reverse flow a coolant system all you're doing is stripping layers of the existing copper.

  44. Avataaar/Circle Created with python_avatars thethumper088 says:

    Plugged heater core on a 5-6 year old truck? That seems awfully soon.

  45. Avataaar/Circle Created with python_avatars Manny Puerta says:

    My Topside Creeper is one of the best tools I’ve ever purchased…requipment for pickup owners who do much of their own work.

  46. Avataaar/Circle Created with python_avatars Brad Baker says:

    What is the best thing to remove rust and mineral deposits burnt into the radiator? Would vinegar work?

  47. Avataaar/Circle Created with python_avatars Larry Ehrlich says:

    FYI: Water boils at a lower temperature as you go up in altitude.

  48. Avataaar/Circle Created with python_avatars Darrellsrelm says:

    Sounds like she has a air pocket probably needs to be burped so the coolant can get throughout the system

  49. Avataaar/Circle Created with python_avatars Thomas Cowan says:

    That topside creeper is cool never seen one before I’m definitely going to look into buying one

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