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Heater not working

Tiny
BHUBBEL
  • MEMBER
  • 2006 TOYOTA TUNDRA
  • V8
  • 4WD
  • AUTOMATIC
  • 120,000 MILES
The heater in my 2006 tundra is not working. The temperature dial rotates from blue to red but does not blow warm air
Tuesday, December 14th, 2010 AT 9:26 PM

8 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Hello,

It sounds like it could be something simple like the engine being low on coolant. But to be sure here is a great guide on fixing your heater.

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

Please let us know what you find. I'm interested to see what it is.

Cheers
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Tuesday, December 14th, 2010 AT 9:38 PM
Tiny
PINOYSAMI
  • MEMBER
  • 2 POSTS
Where is the heater control valve located?
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Friday, October 6th, 2017 AT 12:35 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,536 POSTS
Hi,

I have found the location for you and if this valve is stuck or disconnected from the cable it will cause the heater not to work.

Please let us know what happens and upload pictures or videos of the problem.

Cheers, Ken
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Monday, October 9th, 2017 AT 11:26 AM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Did you bleed the system?
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Tuesday, October 10th, 2017 AT 10:35 AM (Merged)
Tiny
WHOOD
  • MEMBER
  • 1 POST
  • 2003 TOYOTA TUNDRA
  • V8
  • 4WD
  • AUTOMATIC
  • 123,000 MILES
Heater problem
2003 Toyota Tundra V8 Four Wheel Drive Automatic 123000 miles

I jumped into my truck this AM, turned on defroster to clear the windshield, but no heat! Nothing in regular heater mode either. Gauge shows plenty of heat in engine(running normal) but only cool air comes out, despite the temp setting?
Has worked up until today, any suggestions?
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Tuesday, October 10th, 2017 AT 10:35 AM (Merged)
Tiny
DAVE H
  • MECHANIC
  • 13,383 POSTS
Hello . thanks for the donation .. much appreciated

WARM UP ENGINE
DISCONNECT WATER VALVE CONTROL CABLE
INSPECT WATER VALVE OPERATION
Check that warm air blown out the vent when the water valve lever is moved to "WARM" position.
Check that cool air blown out when the water valve is moved to the "COOL" position.
If operation is not as specified, replace the water valve.
CONNECT WATER VALVE CONTROL CABLE
REMOVAL
DRAIN ENGINE COOLANT FROM RADIATOR
NOTE:It is not necessary to drain out all the coolant.

DISCONNECT WATER VALVE CONTROL CABLE FROM WATER VALVE
NOTE:At the time of installation, please refer to the following item.

After connection, adjust the control cable (See INSTALLATION ).
DISCONNECT WATER HOSES
Using pliers, grip the claws of the hose clip and slide the hose clip along the hose.
Disconnect the water hoses.

NOTE:At the time of installation, please refer to the following item.

Heater radiator pipe:
Push the water hose onto the heater radiator pipe as far as second ridge on the pipe.
Water valve:
Push the water hose onto the water valve pipe as far as water valve.
Install the hose clip in a position, as shown in the illustration.
REMOVE WATER VALVE
Remove the bolt and water valve.
Fig. 4: Removing Water Valve


https://www.2carpros.com/forum/automotive_pictures/266999_water_2.jpg



INSTALLATION
Installation is in the reverse order of (See REMOVAL ).
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Tuesday, October 10th, 2017 AT 10:35 AM (Merged)
Tiny
PTCIZMICH
  • MEMBER
  • 2 POSTS
  • 2000 TOYOTA TUNDRA
  • V8
  • 4WD
  • AUTOMATIC
  • 32,000 MILES
Heater problem
2000 Toyota Tundra V8 Four Wheel Drive Automatic 32000 miles

About a week ago the heater stopped putting out hot air. The temp gauge shows mid range and the coolant level is up. How do access the the temperature control system? I tried looking under the dash but could not access the control cable to see if there was a problem with it. What else do I need to look for?
Also, my radio antenna base is loose. I pried off an access tab inside the passenger side of the front fender. I could see that the plastic sheath for the coax was off the cable and it looks like that is what stabilizes the antenna base. How do I access that area without taking off the fender? Or do I have to remove the fender to get to the antenna base?
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Tuesday, October 10th, 2017 AT 10:35 AM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
No heat-check the thermostat and the heater control valve, and heater core-
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Tuesday, October 10th, 2017 AT 10:35 AM (Merged)

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Step 1 - A heater cannot operate unless the engine is full of coolant/antifreeze. If coolant level is low check the system for leaks.

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