Heater only blows cold air?

Tiny
TAMMYJK
  • MEMBER
  • 2014 CHEVROLET EQUINOX
  • 180,000 MILES
I turn the knob to cold temperatures and turn on my A/C for a few seconds then I turn it back to heat and it blows hot air. This just started this morning it has been great up until today
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Tuesday, December 1st, 2020 AT 2:24 PM

23 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

Based on your description, it sounds like the blend air door actuator is going bad. The blend air door is what controls the air temp entering the vehicle. What I would suggest is to remove the actuator and then see if it moves when you change the temperature.

This actuator is located under the hood on the HVAC box. Here is a link that you may find informational. It explains in general how one is replaced. This will give you an idea of what you are looking for.

https://www.2carpros.com/articles/replace-blend-door-motor

If you determine it is bad, here are the directions specific to your vehicle for replacement. The attached pics correlate with the directions.

___________________________________________

First, pic 1 shows the location on your vehicle.

Here are the directions.

2014 Chevy Truck Equinox FWD L4-2.4L
Temperature Valve Actuator Replacement
Vehicle Heating and Air Conditioning Air Door Actuator / Motor Service and Repair Removal and Replacement HVAC - Manual Temperature Valve Actuator Replacement
TEMPERATURE VALVE ACTUATOR REPLACEMENT
Temperature Valve Actuator Replacement

see pic 2

see pic 3

Let me know if this helps.

Joe

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Tuesday, December 1st, 2020 AT 5:18 PM
Tiny
5640
  • MEMBER
  • 2013 CHEVROLET EQUINOX
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 78,000 MILES
My heat was working fine. After work I noticed it was blowing warm air in the upper vent and cold in lower. The vents that are around my feet and knees was cold. I tried every button and even the air and it did not change this. What the heck?
Thanks
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Tuesday, December 29th, 2020 AT 11:22 AM (Merged)
Tiny
JORGE S
  • EXPERT
For this concern you will need an advance scan tool to try and re-calibrate all the servos. That is the first step. If it does not calibrate then a fault code will set for the faulty servo. What you can try and it may or may not work is disconnecting the battery for 15 minutes. Reconnect the battery and turn the ignition switch on with out cranking the engine over for one minute. It may just do a self calibration on its own. Let us know if that resolves the issue. If it does not then you will need a professional shop to do the calibration with the scan tool.

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

Please run down this guide and report back.
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Tuesday, December 29th, 2020 AT 11:22 AM (Merged)
Tiny
5640
  • MEMBER
Thank you. I just had to dump $2,800.00 into a month ago. The whole drive train thing took a crap. I am not a car person but it was a large unit that was too big to ship quickly and it sent the signal from the back to the front tires. I have never had any issues with this vehicle and purchased when it had 20,000 miles on it. Always kept the servicing up. Thinking maybe I need to get rid of it!
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Tuesday, December 29th, 2020 AT 11:22 AM (Merged)
Tiny
KEN L
  • ADMIN
Hello,

It sounds like the mode actuator is out. here is a guide to help you see what's going on and instructions to change the actuator in the diagrams below for your car:

https://www.2carpros.com/articles/replace-blend-door-motor

Check out the diagrams (below). Please let us know what happens.

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Tuesday, December 29th, 2020 AT 11:22 AM (Merged)
Tiny
5640
  • MEMBER
Thank you Ken! I will look and see if I can do it.
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Tuesday, December 29th, 2020 AT 11:22 AM (Merged)
Tiny
KEN L
  • ADMIN
Please let us know what you find. We are interested to see what it is.
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Tuesday, December 29th, 2020 AT 11:22 AM (Merged)
Tiny
MARCUS HECTOR ORTIZ
  • MEMBER
  • 2010 CHEVROLET EQUINOX
  • 2.4L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 160,000 MILES
Went out with my family and the heater was working. When we got in the heater just stopped working. It started to blow cold air no matter how high or low it was it was still blowing cold. Could it be the Thermostat or the temperature blend door actuator?
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Tuesday, December 29th, 2020 AT 11:22 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

It could be either. First, is the engine coolant full? Second, if you have the engine running and the heater on, do both heater core hoses get hot? If they do and the coolant is full, chances are the blend air door is the issue. If only one heater gets hot and the other doesn't, then the coolant isn't flowing through the heater core. However, if the heat was working fine and then stopped, there is a good chance the blend air door is the issue.

Take a look through this link. See if it helps.

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

If you feel the blend door actuator is the problem, here is a link that shows in general how one is replaced:

https://www.2carpros.com/articles/replace-blend-door-motor

Here are the directions specific to your vehicle. The attached pics correlate with the directions.
___________________________________________________

2010 Chevy Truck Equinox FWD L4-2.4L
Temperature Valve Actuator Replacement
Vehicle Heating and Air Conditioning Air Door Actuator / Motor Service and Repair Removal and Replacement HVAC - Manual Temperature Valve Actuator Replacement
TEMPERATURE VALVE ACTUATOR REPLACEMENT
Temperature Valve Actuator Replacement

see pic 1

see pic 2

_________________________________________________

Let me know what you find or if you have other questions.

Take care,
Joe

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Tuesday, December 29th, 2020 AT 11:22 AM (Merged)
Tiny
KEN DALY
  • MEMBER
  • 2010 CHEVROLET EQUINOX
  • 3.2L
  • V6
  • AWD
  • AUTOMATIC
  • 74,000 MILES
Heater was blowing hot air yesterday, we went out last night and the heater was blowing cold air, temperature guage was at about 180 degrees but no heat. Played with the control to raise and lower temperature but it didn't make any difference. What should I look for?
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Tuesday, December 29th, 2020 AT 11:22 AM (Merged)
Tiny
SATURNTECH9
  • EXPERT
Hello,

This sounds like you have a temperature blend door actuator what is out and needs t be replaced. This guide will give you an idea of what you are in for when doing the job.

https://www.2carpros.com/articles/replace-blend-door-motor

Also check the engine coolant level as well becasue if it is low the heater is the first thing to stop working.

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

Here is how it will be on your car (below) which show the blend door actuators locations.

Check out the diagrams (Below)

Please let us know what you find.

Cheers
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+5
Tuesday, December 29th, 2020 AT 11:22 AM (Merged)
Tiny
KEN DALY
  • MEMBER
I have it warming up, there is so much plastic covering the motor it's hard to see anything, where are the hoses located? Not noticeable, the top hose is warmer but not too hot
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Tuesday, December 29th, 2020 AT 11:22 AM (Merged)
Tiny
KEN DALY
  • MEMBER
I did some more checking you were correct with the "Air Temperature Door Actuator" which I replaced now the heater works great again! Ya! It was a little tough but I hung in there and got the job done. Thanks 2Carpros :)
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Tuesday, December 29th, 2020 AT 11:22 AM (Merged)
Tiny
SATURNTECH9
  • EXPERT
Use 2CarPros anytime, we are here to help. Please tell a friend.

Cheers
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Tuesday, December 29th, 2020 AT 11:22 AM (Merged)
Tiny
DELENA ANTHONY
  • MEMBER
  • 2009 CHEVROLET EQUINOX
  • 4.6L
  • V6
  • 2WD
  • AUTOMATIC
  • 200,239 MILES
Sometimes it blows heat and sometimes no air is coming out all vents, works on defrost and floor and other vents just gets warm sometimes.
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Tuesday, December 29th, 2020 AT 11:23 AM (Merged)
Tiny
ASEMASTER6371
  • EXPERT
Good afternoon,

I would check the coolant level to be sure the level is correct.

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

Also, I would replace the thermostat. That will cause low heat.

https://www.2carpros.com/articles/replace-thermostat

Lastly, it could be a clogged heater core. Remove the hoses from the firewall and run a garden hose back and forth in the core tubes until you get a even flow.

Roy
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Tuesday, December 29th, 2020 AT 11:23 AM (Merged)
Tiny
DELENA ANTHONY
  • MEMBER
Will check again.
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Tuesday, December 29th, 2020 AT 11:23 AM (Merged)
Tiny
DELENA ANTHONY
  • MEMBER
Both heater hoses coming from heater core are hot coolant is normal.
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Tuesday, December 29th, 2020 AT 11:23 AM (Merged)
Tiny
ASEMASTER6371
  • EXPERT
It could still be clogged in the core.

Roy
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Tuesday, December 29th, 2020 AT 11:23 AM (Merged)
Tiny
DELENA ANTHONY
  • MEMBER
Okay, going to try flushing today. Thank you
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Tuesday, December 29th, 2020 AT 11:23 AM (Merged)

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