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Heater not working?

Tiny
MONCHO6685
  • MEMBER
  • 2017 HYUNDAI ELANTRA
  • 2.4L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 75,000 MILES
Hi, the problem when I turn on the heater it doesn't blow hot air until I accelerate the car revs. I touch the heater core hoses and one is hot (into the heater core) but the other one not (return hose). That means that I have a clogged heater core. I appreciate the help in this problem (i live in Wisconsin) and really cold here.
Thanks, Juan Marin
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Monday, December 26th, 2022 AT 1:42 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,256 POSTS
Hi Juan,

Yes, it does sound like the core is plugged up, I would check the coolant level first though and if it okay, I would remove the heater hoses and use a garden hose to help flush the core out. Be careful not to over pressurize the core.

Here is a guide that may help as well:

https://www.2carpros.com/articles/car-heater-not-working

Let us know what happens and please upload pictures or videos of the problem.
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Monday, December 26th, 2022 AT 6:12 PM

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