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No heater operation - blend door actuator location?

Tiny
MIKE R1025
  • MEMBER
  • 14 POSTS
Well, it worked for awhile and now it will get a little warm but not warm enough for these current Missouri Temperatures - 4 actual temp. I don't even know where to start.
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Monday, January 1st, 2018 AT 7:53 PM
Tiny
MIKE R1025
  • MEMBER
  • 14 POSTS
Heat at last finally heat at last! I had a feeling we still had air in the system, so we jacked the car up and bled the damn thing all day and night. You have to put the jeep on a tilt to get it all out. We did that before and it didn't work. I guess just didn't get it all the first time. It's working but really not sure how it keeps getting air in.
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Monday, January 8th, 2018 AT 12:16 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,512 POSTS
Glad to hear but the only way air can keep getting in is a leak up high in the system somewhere or you have a slight blown head gasket which pumps exhaust into the system.

https://www.2carpros.com/articles/head-gasket-blown-test

and

https://www.2carpros.com/articles/car-is-leaking-coolant

Please let us know what you find. We are interested to see what it is.

Cheers, Ken
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Monday, January 8th, 2018 AT 12:21 PM
Tiny
MIKE R1025
  • MEMBER
  • 14 POSTS
Yeah, I heard about that. What kind of symptoms come with a slightly blown or blown head gasket, besides exhaust in the system? If there is a leak up high, it must be really slow because I can't find it. I have a feeling it is going to happen again. Thanks.
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Monday, January 8th, 2018 AT 12:25 PM
Tiny
WAKAHOE
  • MEMBER
  • 1 POST
  • 2008 JEEP LIBERTY
  • 3.7L
  • V6
  • 2WD
  • AUTOMATIC
  • 145,000 MILES
When I first turn on my heater it blows hot air for abut a minute or two then it blows cold air. What do I need to check to solve my problem?
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Friday, September 11th, 2020 AT 12:07 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,700 POSTS
I need you to check a couple things. Do the following: with the engine cold, confirm the coolant is full in the radiator. If it is, start the vehicle and allow it to warm up to operating temperature (make sure it is warming up to operating temperature) with the heater on high. When the heat stops and becomes cold, open the hood and locate the two heater hoses which go from the engine to the firewall of the vehicle (heater core). Feel both hoses. If one is hot and the other cold, you have a plugged heater core. Let me know what you find.

Here is a video showing all the things which can cause this problem:

https://www.youtube.com/watch?v=SNRb6pSwYuU
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Friday, September 11th, 2020 AT 12:07 PM (Merged)
Tiny
CINDY SCHERMAN
  • MEMBER
  • 4 POSTS
  • 2008 JEEP LIBERTY
  • 4WD
  • AUTOMATIC
  • 1,846,421 MILES
My heater is not working correctly you can feel heat coming out of the vents on the first notch and a little bit on the second after you move it up further it blows out cold air. The coolant level is fine my car does not overheat to as far as I'm aware the thermostat is fine and when you touch me heater core it's hot. In the air conditioning works fine with all the vent I have been told so many different things I was told I need to flush the heater core, it could be the heater switch that controls it and I was also told I can be the vent relay control console. I'm just wondering if you have any ideas. Another thing that happened is yesterday when I got in the car nothing is coming out of the vents when I would turn the knob I could hear some clicking like from underneath the dashboard. Don't know if that's related not. That help when I restarted the car everything was fine. Please help I don't have a lot of money to be putting in to checking everything. Also if I had hooked up to one of those computer machines would that be able to tell me what it would be?
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Friday, September 11th, 2020 AT 12:07 PM (Merged)
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,512 POSTS
Hello,

The clicking is a clue that the temperature blend door actuator is not working correctly. Here is a guide to help you step by step with instructions in the diagrams below to show you how on your car. Turn the system on so you can hear the noise then use your hand to feel which actor is making the noise.

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

This guide can help as well:

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

Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.
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Friday, September 11th, 2020 AT 12:07 PM (Merged)
Tiny
CINDY SCHERMAN
  • MEMBER
  • 4 POSTS
One more question that had been the only time I have heard the clicking noise and it was when I turned the nob to the settings to the heat temperature besides that time I have not heard it. Do you still think that's the problem? There has been times that nothing has been blowing out at all then I restart the car and it is blowing. Just wanted to make sure u still think that's what it is. Thanks for your help.
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Friday, September 11th, 2020 AT 12:07 PM (Merged)
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,512 POSTS
Yes it does sounds like the actuator is broken and making the noise which needs to be replaced to fix the problem. Can you please shoot a quick video with your phone so we can hear the noise? That would be great. You can upload it here with your response so I can be sure.
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Friday, September 11th, 2020 AT 12:07 PM (Merged)
Tiny
CINDY SCHERMAN
  • MEMBER
  • 4 POSTS
Yes I can. I have but not heard the noise in a few days. This morning nothing was blowing out of the vents or would start blowing then stop. As soon as I hear it again I will send a video think I will go ahead and try to fix that piece seems simple enough.
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Friday, September 11th, 2020 AT 12:07 PM (Merged)
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,512 POSTS
Was the air blowing all the time before and this problem just started? Sure sounds like the temperature blend door actuator is not working correctly.
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Friday, September 11th, 2020 AT 12:07 PM (Merged)
Tiny
CINDY SCHERMAN
  • MEMBER
  • 4 POSTS
Last year it would stop blowing but then stopped after doing it once or twice, but my heat would come out fine. Now it rarely stops blowing but there is barely any heat and the air works great.
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Friday, September 11th, 2020 AT 12:07 PM (Merged)
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,512 POSTS
Okay, it sounds like the blower motor might be going out which is common. here is a guide to help test the motor and show you how to check the power and grounds. The heat will still be the actuator.

https://www.2carpros.com/articles/blower-fan-motor-works-on-high-speed-only

Check out the diagrams (below). Please let us know what happens.
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Friday, September 11th, 2020 AT 12:07 PM (Merged)
Tiny
COLLEENHADDOCK
  • MEMBER
  • 1 POST
  • 2008 JEEP LIBERTY
  • 3.7L
  • 4 CYL
  • 4WD
  • AUTOMATIC
  • 100,000 MILES
Heater is blowing cold air, ac works fine. No leaks or fogging, just blowing cold air?
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Friday, September 11th, 2020 AT 12:07 PM (Merged)
Tiny
HOMER1967
  • MECHANIC
  • 875 POSTS
Hello,

It sounds like you have a temperature blend door actuator that is not working here are two guides to help walk you through the steps of changing it with the location in the diagrams below to show you how on your car.

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

This guide can help as well

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

Check out the diagrams (Below). Please let us know what happens.
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Friday, September 11th, 2020 AT 12:07 PM (Merged)
Tiny
DEA10
  • MEMBER
  • 1 POST
Thank you for this post I got a new actuator everything works again FYI.
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Friday, September 11th, 2020 AT 12:07 PM (Merged)
Tiny
ROOPAW
  • MEMBER
  • 2 POSTS
  • 2008 JEEP LIBERTY
  • 3.7L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 100,000 MILES
Changed the thermostat, purged the system, verified blender door is working. The heater core has been flushed and has no restrictions.
I took the hoses off the heater core with the heat and car running and have no coolant running into the heater core. What would be the cause of no coolant to the heater core?
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Friday, September 11th, 2020 AT 12:07 PM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon,

If you have no flow to the core, then you either have clogged hoses or a bad water pump. Was the coolant level topped off when you removed the hoses?

Does the car overheat?

Roy

1. Disconnect negative battery cable.
2. Drain cooling system See: Cooling System > Procedures > Cooling System - Standard Procedures.
3. If water pump is being replaced, do not unbolt fan blade assembly from thermal viscous fan drive.
4. Remove two fan shroud-to-radiator screws. Disconnect the coolant overflow hose.
5. Remove upper fan shroud and fan blade/viscous fan drive assembly from vehicle.
6. After removing fan blade/viscous fan drive assembly, do not place thermal viscous fan drive in horizontal position. If stored horizontally, silicone fluid in viscous fan drive could drain into its bearing assembly and contaminate lubricant.

ImageOpen In New TabZoom/Print

7. Remove accessory drive belt (1) See: Drive Belt > Removal and Replacement > Accessory Drive Belt - Removal.
8. Remove lower radiator hose clamp and remove lower hose at water pump.
9. Remove seven water pump mounting bolts and one stud bolt.

CAUTION: Do not pry water pump at timing chain case/cover. The machined surfaces may be damaged resulting in leaks.

10. Remove water pump and gasket. Discard gasket.
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Friday, September 11th, 2020 AT 12:07 PM (Merged)
Tiny
JOHNNYP6623
  • MEMBER
  • 2 POSTS
  • 2008 JEEP LIBERTY
  • 3.7L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 77,310 MILES
Not getting heat. Had thermostat replaced system flushed heater core back flushed worked about one month. No sign of antifreeze leaking in car or smell of antifreeze. Mechanic said it may be the heater core. Any other ideas of what it could be before I have it replaced?
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Friday, September 11th, 2020 AT 12:08 PM (Merged)

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