Question about 2000 Toyota 4Runner

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2000 Toyota 4Runner Limited Heater

When heat is called for a small what appears to be a motorized control valve is attempting to move a linkage under the dash. I am assuming that this is some sort of control valve that opens and closes to allow heat or cold air dependant on what the unit is calling for. The control linkage appears to be jammed. I am trying to determine where this linkage goes to under the dash and in order to determine a proper repair plan. As it stands now I can not get any hot air into the car only cold.

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  • 36tree42 Oct 24, 2008

    No Heat 2000 4cyl base 4 Runner  -with all controls set for highest heat - no heat at all AC is great

  • daveybones Jul 12, 2010

    This is a motorized damper control valve is located on the passenger side of the vehicle directly under the left end of the glove compartment on the inside fire wall. The unit opens and closes internal dampers in the vehicle and also is connected to a heat control valve located on the back firewall in the middle of engine compartment,. The unit opens and closes this valve to allow hot water to flow through the internal heater core. It normally is in the near off position in the summner to allow cooling.You can disconnect the linkage and move the vavle manually to get the air conditioning to cool down.
    Ultimately the motorized damper control valve should be replaced to resume automatic heat/cool operation.

    P.S - I was able to open the motorized unit up and flip the plastic drive wheel to a place where it was not worn, I ended up getting a few months out of it but it is now completely failed. Probably not worth the effort. I am now in need of the motorized control unit.

    P.S - 2 - Also, check to make sure that the linkage is moving freely, I found mine to be very stiff and may explain what caused the motorized gearing unit to wear so badly. I was able to free it up using a spray lubricant.



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I have almost the same problem, in this case the power windows, power seats and loock those are not working
I was looking for the fuse but i didn't found it.

Could you helme 4runer 2k limited


Posted on Sep 03, 2008


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Heater for window does not work

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I have no heat in front of my 99 Toyota 4 runner, there is a clicking. Suggestions anyone

I have the same problem with my 99 4Runner. I have narrowed the problem down to the water control valve or something under the dash that pushes the control cable. A temporary solution is to look under your hood. At the top center of the firewall is the water control valve with a small actuator arm with a cable attached to it. Select either full heat or full cool and push that little control arm in the appropriate direction. I hope this helps.

Aug 26, 2010 | 1999 Toyota 4Runner

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Replacing heater core in a 1995 Toyota 4Runner

The heater core is a small heat exchanger located inside the truck, similar to the radiator at the front of the truck. Coolant is circulated from the engine through the heater core and back to the engine. The heater fan blows fresh, outside air through the heater core; the air is heated and sent on to the interior of the truck. For Toyota Pick-ups/Land Cruiser/4Runner 1989-1996 check this reference repair guide...

(see Figure 1)
  1. Drain the cooling system.
  2. Remove the heater unit assembly. Have alot of towels handy for the leakage of coolant that may spill into your interior.
  3. Remove the fasteners securing the core to the unit, remove the plates and clamps. Pull upwards to remove the core from the unit.
To install:
  1. Inspect the core fins for any blockage. Using compressed air, clean them.
  2. Install the core into the unit placing the plates and clamps into position. Tighten the core screws.
  3. Install the heater unit into the vehicle.
  4. Fill the cooling system.

Fig. 1: Exploded view of the heater unit assembly-1996 4Runner shown

(see Figure 1)

Have alot of towels handy for the leakage of coolant that may spill into your interior.
  1. Discharge the A/C system (if applicable), using an approved recovery/recycling machine.
  2. Remove the cooling unit (if applicable).
  3. Drain the cooling system.
CAUTION When draining engine coolant, keep in mind that cats and dogs are attracted to ethylene glycol antifreeze and could drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain coolant into a sealable container. Coolant should be reused unless it is contaminated or is several years old.
  1. Disconnect the hoses to the heater core. Tag each one so that it may be correctly reinstalled.
  2. On some models you will need to remove the glove box assembly. On others, the instrument panel and reinforcement.
  3. At the heater case under the dash, disconnect the ductwork from the case.
  4. Disconnect the heater control cables from the heater case. Lift the spring clip holding the control cable to allow the cable to be manipulated. Don't deform or crimp the cables.
  1. Disconnect the wiring harness to the blower fan.
  2. Remove the three or four bolts holding the heater case to the dash. Because the inlet tubes project through the firewall, the unit will not fall straight down. It will need to be pulled into the passenger compartment and then brought downward.
To install:
  1. Lift the case into position and carefully place the inlet and outlet pipes through the firewall. Install the retaining bolts holding the case to the dash.
  2. Connect the wiring harness to the blower fan.
  3. Connect the control cables to their linkages. Each must be adjusted so that the motion of the dashboard lever causes the correct corresponding motion in the air door. Both the control lever and the door must reach maximum travel at the same time if full function is to be achieved.
    1. Set the dashboard control to FRESH. Lift the adjustment clip and adjust the air inlet cable towards the heater unit until the linkage is at its maximum travel on Pick-Up and 4Runner. For Land Cruiser, adjust the cable away from the case. Release the adjustment clip.
    2. Set the dashboard control to VENT (Pick-Up) or DEF (4Runner and Land Cruiser). Lift the adjustment clip and adjust the air flow control cable towards the heater unit until the linkage is at its maximum travel. Release the adjustment clip.
    3. Set the temperature control to COOL. Lift the adjustment clip and adjust the air mix control damper control cable away from the heater case until the linkage is at its maximum travel on . For Land Cruiser, adjust the cable towards the case.
  4. Connect or reinstall the ductwork. Make certain each tube is firmly and completely fitted on its port. A light spray of glass cleaner serves as a good lubricant; don't use too much.
  5. Install the glove box and/or instrument panel assembly.
  6. Connect the heater hoses. Use new clamps.
  7. Install the cooling unit (if equipped).
  8. Refill the coolant, then charge the A/C system (if equipped).

Hope this help (remember comment and rated this).

Aug 02, 2010 | 1995 Toyota 4Runner

2 Answers

No heat but air conditioner works.

This could mean that the heater core valve is stuck and will not open. Look under the hood behind the engine you will see two hoses going from the engine into the firewall. These circulate hot water (actually coolant/antifreeze) from the engine into the heater core and back. One of the hoses has a valve. Check if you can move it by hand to open it and close it. Then check if the valve moves when you use the heater control on the dash. If no, that means there is a problem with the linkage between the heater controls and the valve. If the the valve is working ok, there could be an obstruction preventing hot water from flowing through the core when the valve is open.

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1 Answer

Plenty of air but no heat one side of dash use to blow hot air. Now neither side blows hot air. 2000 jeep grand cherokee coolant is fine driver side seat heater doesn"t work air bag light comes on every...

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2000 Toyota 4Runner stalls on idle

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I will spend one hour to look over the engine from top to bottom to check for bad connections and disconnected vacuum / air tubes.

Are you getting any additional OBD-II code(s)?

Please post it on the comment window.

Nov 25, 2008 | 2000 Toyota 4Runner

1 Answer

Heater control slider broken, need heat for winter

Try this: Go out to the vehicle, and open the hood. In the center of the engine compartment, mounted to the firewall, is the heater valve. You can't miss it, it has two hoses and a cable connected to it. If the slider on the dash is doing nothing, the cable may be off of the valve arm, slip it back on & retry it.... If the cable is not off, detach it from the arm, & move it in & out of the cable housing; the heat control on the dash should move. If it does not move, the cable is bad.
What you can do: Just move the arm that the cable connects to on the heater valve the other direction, to to allow the hot water pass thru the valve, and into the heater core.
You can run it like this all winter.
Hope this helps, and thanks for choosing FixYa.
Please feel free to post back if you have any questions regarding this solution.

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