Heat not working

Tiny
KGREENE
  • MEMBER
  • 2005 CHEVROLET SILVERADO
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 130,000 MILES
Driver side blows cold air while passenger side blows hot air when heat is on. I changed the blend door actuator for driver side still blows cold air. I even moved flap for blend door by hand to see if changing the position would make hot air come from driver side vents. But it did not. Still blows cold air I am at a loss for what it could be.
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Saturday, October 6th, 2018 AT 3:52 PM

17 Replies

Tiny
ASEMASTER6371
  • EXPERT
Good morning.

Are both heater hoses hot under the hood going into the truck?

It sounds like the heater core is either low in coolant or it is partially clogged.

You can try to flush it yourself by removing both hoses and use a garden hose to run into each side. Run it back and forth until all debris is gone and you have a good flow from both sides.

Beyond that, you may need a heater core.

Roy

https://www.2carpros.com/articles/car-heater-not-working
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Sunday, October 7th, 2018 AT 5:27 AM
Tiny
KGREENE
  • MEMBER
Okay, so I flushed core like you said from both sides small amount of debris cam out but not a lot to plug it. Still the heat only works on passenger side. I turned A/C on and only cold air came from passenger side. Is there some sensor in there that could be bad why it only blows fan air on driver side?
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Sunday, October 7th, 2018 AT 2:50 PM
Tiny
ASEMASTER6371
  • EXPERT
Nope, no sensor. You said you moved the door manually and no heat. That leaves only the heater core.

Roy

Heater/Vent Module Replacement

Removal Procedure

1. Drain the engine coolant. Refer to Cooling System Draining and Filling See: Cooling System > Removal and Replacement.
2. If equipped remove the auxiliary battery.
3. Reposition the inlet heater hose clamp from the heater core.
4. Remove the inlet heater hose from the heater core.
5. Reposition the outlet heater hose clamp from the heater core.
6. Remove the outlet heater hose from the heater core.
7. Remove the I/P carrier. Refer to Instrument Panel Carrier Replacement See: Dashboard / Instrument Panel > Removal and Replacement.
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Sunday, October 7th, 2018 AT 2:57 PM
Tiny
KGREENE
  • MEMBER
My truck is a quadrasteer too. I do not know if that can have different style of HVAC system.
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Sunday, October 7th, 2018 AT 2:57 PM
Tiny
ASEMASTER6371
  • EXPERT
Nope, same heating system.

Roy
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Sunday, October 7th, 2018 AT 2:58 PM
Tiny
KGREENE
  • MEMBER
Okay, so the heater core you are thinking? But why would the A/C not blow cold air on the driver side?
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Sunday, October 7th, 2018 AT 2:59 PM
Tiny
ASEMASTER6371
  • EXPERT
That is a separate issue. It may be actuator door related just for that part of the issue.

Roy
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Sunday, October 7th, 2018 AT 3:05 PM
Tiny
KGREENE
  • MEMBER
I changed heater core still no heat on drivers side.
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Tuesday, October 9th, 2018 AT 9:48 AM
Tiny
ASEMASTER6371
  • EXPERT
Did you bleed the cooling system of air?

If you manually move the blend door, do you get heat?

Roy
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Tuesday, October 9th, 2018 AT 5:38 PM
Tiny
KGREENE
  • MEMBER
Yeah, I burped the radiator reserve until it filled to full line and yeah I manually turned blend door both directions still no heat.
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Tuesday, October 9th, 2018 AT 5:41 PM
Tiny
ASEMASTER6371
  • EXPERT
Are both heater hoses hot to the touch?
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Tuesday, October 9th, 2018 AT 6:11 PM
Tiny
KGREENE
  • MEMBER
Hot when the trucks running and yet again AC not blowing cold from driver side only passenger side just decided to see if heater core would have fixed both. I do not know is there a damper door I am missing before the driver and passenger blend doors or could my blower motor resister be telling it to not blow hot or AC on drivers?
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Tuesday, October 9th, 2018 AT 6:14 PM
Tiny
ASEMASTER6371
  • EXPERT
I am confused.

You stated originally you had no heat on the drivers side.

Now you say you have no AC on the drivers which tells me you have heat?

Am I missing something?

Roy
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Tuesday, October 9th, 2018 AT 6:29 PM
Tiny
KGREENE
  • MEMBER
I have no heat on drivers side and no ac I told you the ac was not coming out from drivers side then you said that was different issue. If my blend door actuators are working and calibrated blower motor is working and heater core and AC both work on passenger side but not on driver side replaced heater controls and blend door actuator for driver side and heater core and no heat or AC will come out of drivers side. What else could it be?
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Tuesday, October 9th, 2018 AT 6:35 PM
Tiny
ASEMASTER6371
  • EXPERT
Did you calibrate the new actuator on the drivers side?
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Tuesday, October 9th, 2018 AT 6:41 PM
Tiny
KGREENE
  • MEMBER
Yes I did. I have dual climate controls and it is the automatic temperature controls like the digital screen for the temperature and the blend door for defrost feet or vents is working properly as well.
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Tuesday, October 9th, 2018 AT 6:43 PM
Tiny
ASEMASTER6371
  • EXPERT
Did you bleed the system? You need to run the engine around 1200 rpm with the radiator cap off for about five minutes. See if the coolant drops and add as necessary. The heater core is the highest point in the cooling system and air will settle there until forced out.

Roy
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Wednesday, October 10th, 2018 AT 3:55 AM

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