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Electrical & Computer SystemsDetails discussions regarding electrical components, wiring, all lighting, wire harnesses and HID conversion for your vehicle.
This is a discussion thread titled "Anyone have any trouble with Tundra heater?", within the Electrical & Computer Systems forum, part of the Technical & Vehicle Assistance Forums category.
The fan blows in all speeds. The valve lever moves, and both sides of hose get hot. I guess a possiblity might be that the valve is not opening and only the lever moves, but I doubt it. Are you sure the only damper in the system is for the recirc air? This works okay, as you can hear the difference when recirc is selected. I did notice this morning that the small vent under the steering wheel is blowing slightly warmer air than the rest of the vents, which are blowing ambient temp air only. I've not checked the coolant level, but I'll do this at lunch. I've not noticed any puddles, so I hope my coolant level is not down. That could mean something awful. Thanks for all your help guys.
Repair manual suggestions:
Symptom: No air temperature control
Suspect Areas
1. Engine coolant volume
2. Heater control assembly
3. Water valve
Sympton: No warm air comes out
Suspect Area
1. Engine coolant volume
2. Heater control assembly
3. Water valve
4. Heater radiator
__________________ ~Glenn~
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Symptom: No air temperature control
Suspect Areas
1. Engine coolant volume
2. Heater control assembly
3. Water valve
Sympton: No warm air comes out
Suspect Area
1. Engine coolant volume
2. Heater control assembly
3. Water valve
4. Heater radiator
Thanks parrot.
1. I checked the radiator for coolant. It is filled properly.
2. The heater control? The cable is connected to the valve properly.
3. My next move is to inspect the valve for proper internal operation, I guess.
4. If not the valve I would say a blocked heater core. I think this is highly unlikely given the age of this vehicle, but I guess any assembly guy can have a bad day!
I'll keep you guys posted on what I find. Thanks for all your suggestions.
Okay, this thing is still broken. Coolant level was fine. I took the valve out, and the valve works fine. So apparently there is flow to the heater core. Are you guys sure that the only thing the temp control knob is hooked to, is the flow valve? Is there nothing that moves a damper or something? This weekend I guess I'll have to tear into the dash. Then I'll shoot water through the heater core to see if there's an obstruction. But first, I believe I'll talk to the dealership and see if they will work with me on the warranty (I'm 4k miles out of 36k). After all, this is a Toyota. Silly stuff like this happens to Fords, Dodge, and Chevys. Not a dang Toyota!!!!
Okay, this thing is still broken. Coolant level was fine. I took the valve out, and the valve works fine. So apparently there is flow to the heater core. Are you guys sure that the only thing the temp control knob is hooked to, is the flow valve? Is there nothing that moves a damper or something? This weekend I guess I'll have to tear into the dash. Then I'll shoot water through the heater core to see if there's an obstruction. But first, I believe I'll talk to the dealership and see if they will work with me on the warranty (I'm 4k miles out of 36k). After all, this is a Toyota. Silly stuff like this happens to Fords, Dodge, and Chevys. Not a dang Toyota!!!!
You should be able to shoot water thru the heater core without getting into the dash. Discounnect both hoses coming out of the fire wall. Try to run the water backwards thu core. If its stopped up, back flushing might help. You said you were getting some heat on the floor. Might be a damper thing. Is the truck idling rough? I had a Ford van that was giving me trouble with the dampers changing. They were vacuum operated. A vacuum leak caused it to idle rough and kept the dampers from changing. Dont know how the dampers work on the Tundra. Good Luck---Buzz
You should be able to shoot water thru the heater core without getting into the dash. Discounnect both hoses coming out of the fire wall. Try to run the water backwards thu core. If its stopped up, back flushing might help. You said you were getting some heat on the floor. Might be a damper thing. Is the truck idling rough? I had a Ford van that was giving me trouble with the dampers changing. They were vacuum operated. A vacuum leak caused it to idle rough and kept the dampers from changing. Dont know how the dampers work on the Tundra. Good Luck---Buzz
Naw, Buzz. I know I won't have to get into the dash to squirt through the core; I meant- to get to the controls. Rough idle? Never. The truck runs like new. And I don't see anything that looks vacuum going through the firewall. I'm starting to think that another cable or lever connected to the temp knob might move a damper or something. I also think a clogged heater core is a real longshot. I mean, what could've clogged it? And I really hate to squirt tap water into my heater core. The coolant still looks new. I guess it'd be a good time to change it anyway. Thanks again.
A damper it was. I had a chance to look at the heater controls today and saw not one, but two cables connected to the temp control gears. The first cable (on top) was the control for the flow valve I've been referring to. Well, lo and behold, the second cable was indeed connected to the bottom side of the control, as it should have been. Following the cable to it's other end (under the glovebox, near floor) I spied the culprit. The cable housing was pulled out of a retaining clip, making any cable movement to a damper ineffective. Re-installed cable housing in retainer- VOILA! I now have heat, problem solved. Thanks again, everyone, for all you suggestions.
p.s. My carpool buddy probably kicked the cable out of the clip by accident. It IS designed in a poor location. Look at yours and see for yourself.
A damper it was. I had a chance to look at the heater controls today and saw not one, but two cables connected to the temp control gears. The first cable (on top) was the control for the flow valve I've been referring to. Well, lo and behold, the second cable was indeed connected to the bottom side of the control, as it should have been. Following the cable to it's other end (under the glovebox, near floor) I spied the culprit. The cable housing was pulled out of a retaining clip, making any cable movement to a damper ineffective. Re-installed cable housing in retainer- VOILA! I now have heat, problem solved. Thanks again, everyone, for all you suggestions.
p.s. My carpool buddy probably kicked the cable out of the clip by accident. It IS designed in a poor location. Look at yours and see for yourself.
GREAT!!!-----Glad you got it fixed. Now bring on the cool weather.---Buzz
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