Heater blows cold air?

Tiny
ALEXBR
  • MEMBER
  • 2009 CHEVROLET CORVETTE
  • 6.2L
  • V8
  • 2WD
  • AUTOMATIC
  • 120,000 MILES
About a year ago the radiator and upper and lower hoses were changed along with the thermostat and a reservoir hose. I cannot remember if the heater was blowing hot air or not then, I think it was. Now A/C works fine but Heat only blows cold air from all vents. When looked into Door Actuators, I heard Right Air Temperature Actuator trying to move but sounded like it was struggling. Any suggestions on whether it is the problem (because dash has to come out in order to replace it) or where else to start digging? Thanks
Monday, December 30th, 2024 AT 1:44 PM

10 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 49,440 POSTS
I would check the engine coolant level first and then feel each of the heater hoses when the engine is warm. Here is a video that can help us see what is going on, also does the heat working on either side or just not on one side? If it is just the right side, then I would say it will be the right-side blend door actuator.

https://www.youtube.com/watch?v=SNRb6pSwYuU&t

Can I ask if the airflow to the correct vents is working? Please go over the video and get back to me.
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Tuesday, December 31st, 2024 AT 5:40 PM
Tiny
ALEXBR
  • MEMBER
  • 7 POSTS
Thanks for the reply. The coolant level is good and has been good since I did the work. Did not get a chance to check heater core hoses for possible core failure or air pocket, but before I get it back to dig in more (friend's car). Is there anything else you can suggest to keep an eye for? I'll reply back after the car is in my possession.
Thanks a lot
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Friday, January 3rd, 2025 AT 1:11 PM
Tiny
ALEXBR
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  • 7 POSTS
And yes, air flow is going to the right vents and is blowing out of all of them equally.
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Friday, January 3rd, 2025 AT 1:12 PM
Tiny
ALEXBR
  • MEMBER
  • 7 POSTS
And heat is blowing cold air from all vents.
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Friday, January 3rd, 2025 AT 1:13 PM
Tiny
KEN L
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Oh yes, the heater core can have air in it, I would remove the radiator cap, start the engine so it can get warm, then jack the front of the car up, and then the rear of the car to help get the air bubbles out. You should see the coolant level drop a little if this is the problem.

https://www.2carpros.com/articles/jack-up-and-lift-your-car-safely

Let me know.
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Saturday, January 4th, 2025 AT 11:15 AM
Tiny
ALEXBR
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  • 7 POSTS
Good morning. I'll let you know once get a chance to do it. Thank you very much.
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Monday, January 6th, 2025 AT 6:01 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
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You are welcome, I hope it helps :)
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Monday, January 6th, 2025 AT 10:09 AM
Tiny
ALEXBR
  • MEMBER
  • 7 POSTS
Hi, Ken. I wanted to update you.
! Heater core hose was slightly warm and the other one pretty much cold. Tried airing it out, ifted front, then back and nothing. Disconnected the hoses, blew air out and ran new coolant through it and it worked like a charm. )
Thank you very much and I'll let you know if have any other questions or concerns.
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Tuesday, February 4th, 2025 AT 8:10 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 49,440 POSTS
Glad you could get it fixed, thanks for letting us know. Please use 2CarPros anytime we are here to help.
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Tuesday, February 4th, 2025 AT 9:16 AM
Tiny
ALEXBR
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Appreciate you.
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Tuesday, February 4th, 2025 AT 9:43 AM

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