Heater not working?

2017 HYUNDAI ELANTRA
75,000 MILES • 2.4L • 4 CYL • 2WD • AUTOMATIC
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MONCHO6685
  • MEMBER
  • 118 POSTS
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
Dec 26, 2022 at 1:42 PM
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STRAILER
  • ✓ASE Certified Mechanic
  • 54,832 POSTS
  • ASE Certified Mechanic
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.
Dec 26, 2022 at 6:12 PM
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