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Heater not working

Tiny
ARMADA07
  • MEMBER
  • 2007 NISSAN ARMADA
  • V8
  • 2WD
  • AUTOMATIC
  • 110,302 MILES
Why is my heat blowing cold air in my 2007 nissan armada?The fan is operating and the heat was just working two days ago.
Monday, January 24th, 2011 AT 3:07 AM

18 Replies

Tiny
SAMTHEMAN
  • MEMBER
  • 31 POSTS
My first thing would be to check your coolant level, There may be just enough to keep the car running fine. Another thing would be to check to see if your heating hoses are hot. Here is a guide to help us see what's going on.

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

Is sounds like a temperature blend door actuator is not working. Here is a guide to walk you through the steps and the location of the actuator so you can change it out.

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

Check out the diagrams (Below). Please let us know what you find. We are interested to see what it is.

Cheers
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Monday, January 24th, 2011 AT 3:59 AM
Tiny
OMARRIVAS_92
  • MEMBER
  • 0 POST
Thank you for this post I got a new mode actuator for $78.00 and installed it everything works great! I love this site.
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Tuesday, October 16th, 2018 AT 12:23 PM
Tiny
LJCALLES
  • MEMBER
  • 16 POSTS
  • 2004 NISSAN ARMADA
  • V8
  • RWD
  • AUTOMATIC
  • 170,000 MILES
There is a knocking sound in my dashboard, the heater will blow cold air only
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Tuesday, October 16th, 2018 AT 12:23 PM (Merged)
Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
You have an air lock in the heater, have you been topping up the coolant? If so get a cooling system pressure test done to help locate the leak.
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Tuesday, October 16th, 2018 AT 12:23 PM (Merged)
Tiny
LJCALLES
  • MEMBER
  • 16 POSTS
Thank you, I will get that checked out. I've also read that it could be be the blender door actuator and the dashboard needs to be removed to replace the part?
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Tuesday, October 16th, 2018 AT 12:23 PM (Merged)
Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
If you have not been having a problem with coolant loos then that would be the next place to look, feel the heater hoses with the engine hot, if you have good circulation and no air lock both hoses will be hot to touch.
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Tuesday, October 16th, 2018 AT 12:23 PM (Merged)
Tiny
LJCALLES
  • MEMBER
  • 16 POSTS
I never used my air conditioning in the summer so it def could be coolant. Thanks for the info. You have been great!
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Tuesday, October 16th, 2018 AT 12:23 PM (Merged)
Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Ok, hope its not a big deal to fix, if you get stuck re post for further assistance.
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Tuesday, October 16th, 2018 AT 12:23 PM (Merged)
Tiny
LJCALLES
  • MEMBER
  • 16 POSTS
Coolant in radiator is def low. Will add this weekend. The reservoir is at normal level though. I'll let you know
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Tuesday, October 16th, 2018 AT 12:23 PM (Merged)
Tiny
NORSTROM73
  • MEMBER
  • 1 POST
  • 2008 NISSAN ARMADA
  • 90,000 MILES
The heater on my Armada apparently no longer works. My mechanic was told the control box which runs some part that is connected to two hoses no longer works. We had the control box replaced and apparently the car still does not put out heat.

Is it possible that something as simple as the wires that connect the control box to this part that connects these two hoses?

Thank you.
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Tuesday, October 16th, 2018 AT 12:23 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Is this automatic tem p control as that is all the list. Have all the fuses been checked there some at right side of dash along with the av control that picks up from the pcm. This may have to be scanned to find out what is really wrong.
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Tuesday, October 16th, 2018 AT 12:23 PM (Merged)
Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
OK, defiantly sounding like hammer due to an air lock, make sure you locate and repair and coolant leaks.
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Tuesday, October 16th, 2018 AT 12:23 PM (Merged)
Tiny
LJCALLES
  • MEMBER
  • 16 POSTS
Added anitfreeze directly into radiator and heat works like a charm. Taking this weekend to have hoses checked. What is a air lock? It only "hammers" when I put heat on then stops.
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Tuesday, October 16th, 2018 AT 12:23 PM (Merged)
Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Air lock is when you have air trapped in the heater core, like when you open a tap at home and you get that noise behind the wall, if you are unlucky that is, you need to ensure that all air is bleed out of the heater system.
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Tuesday, October 16th, 2018 AT 12:23 PM (Merged)
Tiny
LJCALLES
  • MEMBER
  • 16 POSTS
How does one bleed the air out of the heater core? Can I do it or do I need to see mechanic. Thank you for all your helpful info.
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Tuesday, October 16th, 2018 AT 12:23 PM (Merged)
Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
It really should self bleed, but if it is a problem with air trapped in the heater, try and elevate the front of the car so the coolant filler is at the highest point, run the engine with the heater on high, air should make its way out as the system heats up, with the car at normal temp both heater hoses at the fire wall should be hot to touch.
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Tuesday, October 16th, 2018 AT 12:23 PM (Merged)
Tiny
2CP-ARCHIVES
  • MEMBER
  • 4,540 POSTS
  • 2006 NISSAN ARMADA
  • 120,000 MILES
No Heat. Replaced heater control valve because only one side was hot. Now both sides are hot and still no heat. I can see actuators under dash working while changing temp controller. Coolant is clean so wouldn't think its clogged. What am I missing?
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Tuesday, October 16th, 2018 AT 12:24 PM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Did you bleed cooling system after replacing the control valve? Remove radiator cap with cold engine and check coolant level in radiator, top up if necessary.

Check the air-mix actuator operations, item # 5.
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Tuesday, October 16th, 2018 AT 12:24 PM (Merged)

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