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04 tacoma, v6, 4x4, 5 spd, trd. heater not working. checked water valve in eng comp, would not move with control cable attached, removed control unit (by passenger foot well) checked motor with bench battery, motor works, haven't removed dash heater control yet, but a/c works fine. Also with lower control unit removed, cable to water valve works, also cable (unable to see exactly what it is at this stage) that controls air flow door will move manually. Whats your best guess as to where the problem is, dash controls or lower control unit?

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  • mudywaters2 Sep 20, 2010

    Found the problem. it was an electrical connector near that control unit (with the motor) that was partialy disconnected. I found it when I was re installing the control unit and bumped it. The mystery is how it got loose as all the connectors have snap locks.

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  • Toyota Master
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The heater is controlled by that valve - you don't get heat because that valve isn't opened. Take the control cable out of it and try to open the valve.
If it opens and the water flows freely then the problem is in the dash controls unit - more precisely in the rotary temp button (where that cable goes).
If you can't open it then it's clogged and must be replaced.

Posted on Sep 15, 2010

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1 Answer

Toyota Tacoma heater will not blow hot air


-Check heater control valve. (The one open and closed water)
it should move when turn to hot or cold. If it move or turn.
-Next disconnect the heater hoses (Two lines) and flush with garden water hose from both direction for couple minutes.

You should be good for winter.

mai

Oct 10, 2013 | Toyota Tacoma Cars & Trucks

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My heater does not work on my toyota tacoma 2007 prerunner, the fan is only working...


heater core might be blown-off. also see your fuses for heater under your dash fuse panel or at the under hood sometimes where they are.check your cold lever position might be at full cold counter clock wise, move it to hot position clock wise.

Jan 12, 2011 | 2007 Toyota Tacoma

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The heater control knob will not turn all the way to either hot (right) or cold (left) so therefore I only get medium warm or medium cold. I assume the knob moves a cable but I cannot see it or remove the...


Cable is probably kinked or slipped adjustment. There are 2 cables connected to the knob. One move the blend door in the heater box to make the air flow thru the heater core, and the other cable opens a valve in the heater hose (engine compartment) to let the hot engine water into the heater core. Check both cables for kinks and fix and kinks. It is still doesn't work, first disconnect both cables at the blend door and valve and check the door and the valve for proper operation (can you open and close them by hand?--if not, these must be repaired or replaced), then, if good, adjust the cables according to this procedure from autozone.com:


CONTROL CABLE Adjustment

  1. Under the hood, open the clamp and disconnect the heater control valve cable from the arm.
  2. Under the dash, detach the air mix control cable from the clamp. Pull the cable from the control arm.
  3. Position the temperature control at MAX COOL.
  4. Turn the air mix control arm counterclockwise until it stops.
  5. Attach the air mix control cable to the arm.
  6. Snap the air mix cable hook into the cable clamp.
  7. Under the hood, turn the control valve to the fully closed position.
  8. Install the heater valve cable to the arm.
  9. Gently pull on the cable housing to remove any slack.
  10. Insert the cable into the clamp.

Oct 20, 2010 | 1996 Honda Accord

1 Answer

How to replace a heater core


Heater Core Removal & Installation Front To Remove:
  1. Make sure you have the anti-theft codes for the audio and the navigation system, and then write down the audio presets.
  2. Disconnect the negative cable from the battery.
  3. From under the hood, disconnect the heater valve cable from the heater valve. Turn the heater valve arm to the fully opened position.
  4. When the engine is cool, drain the engine coolant from the radiator.
  5. Disconnect the inlet heater hose and the outlet heater hose from the heater core.
  6. Remove the mounting nut from the heater unit. Take care not to damage or bend the fuel lines, the brake lines, and related parts.
  7. Remove the dashboard.
  8. Remove the evaporator.
  9. Remove the mounting bolts and remove the heater unit. Front heater unit honda-10-00-4128.gif

  10. Remove the self-tapping screws and the clamp.
  11. Carefully pull out the heater core so you don't bend the inlet and outlet pipes.
Front heater core honda-10-00-4129.gif

To Install:
  1. Using care, install the heater core to the heater unit and secure.
  2. Using care, install the heater unit and tighten mounting nuts and bolts to 7 ft-lb (10 Nm).
  3. Install the evaporator.
  4. Install the dashboard.
  5. Connect the inlet heater hose and the outlet heater hose to the heater core.
  6. Connect the heater valve cable to the heater valve.
  7. Refill the cooling system with engine coolant.
  8. Adjust the heater valve cable.
  9. Make sure that there is no coolant leakage.
  10. Make sure that there is no air leakage.
  11. Connect the negative battery cable.
  12. Perform the power window control unit resetting procedure.
  13. Enter the anti-theft codes for the audio and the navigation system, and then enter the audio presets.
Rear To Remove:
NOTE: The rear blower motor, the rear heater core, the blower screen, the rear blower resistor (heating/air conditioning system) and the rear power transistor (climate control system), the rear air mix control motor (climate control system) , the rear mode control motor and the rear expansion valve can be replaced without removing the rear heater-A/C unit.
  1. Remove the self-tapping screws and the clamp, and then remove the bolts and the rear evaporator lines with the rear expansion valve. If necessary, remove the rear expansion valve. Use a second wrench to hold the other fitting on the valve so the rear evaporator lines won't twist. Leave the first fitting loosely connected so you can use it to hold the valve while you loosen the second fitting.
  2. Remove the rear heater hoses.
  3. If necessary, remove the rear blower motor, the rear heater core, the blower screen, the rear blower resistor (heating/air conditioning system), the rear power transistor (climate control system), the rear air mix control motor and the rear mode control motor.
  4. Remove the self-tapping screws and the lower housing.
  5. Remove the self-tapping screws, and carefully separate the left upper housing from the right upper housing. Remove the rear heater core.
Rear evaporator assembly honda-10-00-4116.gif

To Install:
  1. Replace the rear heater core.
  2. Attach the heater hoses.
  3. Make sure no air is leaking from the left upper housing and the right upper housing fitting and from the upper housings and the lower housing fitting.
  4. Before reassembly, make sure that the rear air mix control linkage and door move smoothly without binding.
  5. Before reassembly, make sure that the rear mode control linkage and door move smoothly without binding.
  6. Reassemble the housing.
  7. After reassembly, make sure the rear air mix control motor runs smoothly.
  8. After reassembly, make sure the rear mode control motor runs smoothly.
  9. Refill the cooling system and make sure that there is no coolant leakage.
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Oct 16, 2010 | 2005 Honda Pilot

1 Answer

My AC/Heater fan blower just works on high, but when I hit a bump big enough to cause a significant vibration, I can use the other speeds (low, medium etc...). If I hit the bump again it'll just work on...


wiggle the wires behind the control unit to see if maybe there's a loose wire. If that does not work, then try tapping the climate control switch, if it works then you know it's your switch that needs to be replaced. If you want to fix it yourself, just take it out and dissasemble it and clean the unit with alcohol or nail polish remover and try it again on the part (knob) that makes contact with the board. a new unit is very expensive.

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3 Answers

My 2001 toyota tundra heater wont blow hot air. I checked to see if the heater core is cloged it seems fine the heater control valve is operating properly, and I changed the thermastat. and yet the heater...


If you've changed the coolant recently, it could be air locked in the heater core. To remove park the truck with the front higher than the back and remove the radiator cap. Start the engine and let it run while watching for a big air bubble burp coming out the radiator neck. Top off the coolant and continue.

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1 Answer

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1 Answer

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A little common sense goes a long way.
If anyone has been working on car in the same area i.e. radio..etc. this could cause one to investigate possible problems as a result.

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