Heater not working properly

Tiny
ANONYMOUS
  • MEMBER
  • 2009 TOYOTA COROLLA
  • 15,000 MILES
Dear specialist

My car listed above is an LE with a 1.8L.

I am anxious that my heater core doesn’t work normally, it doesn’t blow enough warm in the cabin.

Maybe the car’s heater blows warm after enough working engine? But after driving 15 minutes, as I look at the water temperature dart, it keeps as normal level it must be.

Thank you
Wednesday, November 14th, 2012 AT 8:31 AM

3 Replies

Tiny
DRCRANKNWRENCH
  • MECHANIC
  • 3,380 POSTS
If you have a temperature gauge that is stock, they are not very accurate. Especially if your thermostat is not quite closing enough to keep the coolant warm enough for interior or cabin heat.
So, you might try changing the thermostat.
Also, sometimes air gets stuck in the heater core. To bleed the air out of the system, try this:
Remove the radiator cap with engine cool
Turn heater all the way to hottest setting
Start car and bring to operating temperature
Top off and take for a test drive
You may have to repeat again after engine is cooled off.
See if that works.
A lot of engines have aluminum heads these days and barely stay hot enough to keep the heater core hot enough for warm cabin air. It is likely that the thermostat may be bad even if they are no other issues. You might also try replacing the radiator cap as the system will not function correctly if the cap has gone bad.
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Wednesday, November 14th, 2012 AT 8:56 AM
Tiny
SERENA CRIDER
  • MEMBER
  • 1 POST
I have a 2008 Toyota Corolla. I bypassed it because the was antifreeze in my floorboard. So, I haven't had a heater since. I bought a new heater core and it's getting colder so I need the heater. I would really appreciate a quick response because here in Oklahoma the weather always changes, and I don't want my engine to freeze. Please help. Thank you for your time!
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Monday, November 22nd, 2021 AT 6:34 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,014 POSTS
Hi,

As long as you have antifreeze in the engine (50/50 mixture) you should be fine as far as the engine freezing.

However, I don't think that is what you needed. I believe you need directions for replacing the heater core. So, if that is the case, here is a link that explains in general how it's done. Take a look through the link and let me know if you are comfortable doing it. Also, let me know if there is anything I can do to help.

https://www.2carpros.com/articles/replace-heater-core

Let me know.

Take care,

Joe

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Wednesday, November 24th, 2021 AT 10:07 PM

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