Question about 1987 Toyota 4Runner

1 Answer

Heater control slider broken, need heat for winter

Something broke inside the heater control on the dash, slider doesn't catch anything to make the heater core turn on anymore. My mechanic told me that I could possibly bypass that control and just set it to full on for the winter, by changing a switch(?) under the dash near the fuse box or in the motor near the heater core. I'm looking for a pic or diagram that could show me what to look for and how to set it to full on. thanks

Posted by on


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Toyota Master
  • 1,861 Answers

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.

Posted on Nov 06, 2008


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer


It may be your mode door that is not closing to make that transition to heat or your head unit has a leak(if controlled by vacuum) or if it is electronic then you might need to get a new one.

Jun 17, 2012 | Cars & Trucks

2 Answers

I have a 2002 Ford torus that doesn't put out enough heat in the winter I have flushed out the heater core and change the thermostate but it still don't get warm enough and it doesn't have a...

If both heater hoses are getting hot then you know the coolant has to be flowing and the core should be hot.
What you will have to do is locate the blend air door servo.
The blend air door is a door (or flap) between the heater core and the A/C evaporator (even without a/c there is still a door to control the cabin temp)
Early vehicles with the slider controls used a cable but the later vehicles with a rotary knob or digital buttons use a servo to rotate the door mechanism.
The servos can go bad and the switches as well.
But from the sounds of it, your door is not moving to allow the heat through the vents.

Oct 01, 2011 | Cars & Trucks

1 Answer

95 Jeep Grand Cherokee. A/C only blows heat. Dealer mechanic says something broken in dash and very costly to fix--not worth the money on old vehicle. If clamp heater/radiator hose, can get partial AC,...

Put an small brass butterfly valve in the heater line, on both sides. That will turn it off for the summer, and you can turn it on for winter. Alternatively, you could try and do like I'm doing on my '59 Chevy, when I get it out of the flood plain, and route ice water through the heater core.

Jun 05, 2011 | Jeep Grand Cherokee Cars & Trucks

1 Answer

What causes heat not to work in 1989 sentra? the thermostat was replaced and so were fuses

will try to help. is your radiator full and has been winterized? as far as,has it had antifreeze put into radiator? low coolant in radiator is#1 problem for no heat. you've replaced the thermostat, so that's new. good thing. no leaks?is the heater fan blowing? when you turn the heat up,do you hear something in the dash moving? or do you feel resistance in the slider[the red zone] when turning the heater on,on the dash? if not, the acuator,or heater control valve on the dash may be bad. if the heater fan;s not coming on, are you sure you checked all fuses?even the one's under the hood in the black box? hope this helps and thank you for choosing if you need further assistance,please repost your question and an expert will be happy to assist!

Dec 09, 2010 | 1989 Nissan Sentra 4 Door

1 Answer

No heat

do you have the car at running temperature,if you do check the temp of one heater hose to the other if they are not the same the heater core is plugging up.if they are the same that is the heat you should be getting inside

Dec 27, 2009 | 1980 Chrysler Cordoba

1 Answer

1982 cordoba blows cold air ,no heat inside,the slide bar for hot and cold seems to have broken inside the dash ,how can i get heat in car ,the car has never been winter driven,seems some kind of door...

the valve that control the heat is run by a cable from your heater assembly is located out under the hood,follow the two heater hoses to the fire wall,you will see one hose has a valve in it,one position lets water flow,the other doesn't.

Dec 27, 2009 | 1980 Chrysler Cordoba

1 Answer

Ford Windstar SE, 3.8L V6, 1999, front seat heat/defrost is cold

the blendor actuators strip out the gear inside the actuator cases on these all the time. replace the actuator.

Mar 10, 2009 | 1997 Ford Windstar

1 Answer

2000 Linc ls v8 auto question james from ILL.

maybe you won't need to. On the fire wall you will see 2 hoses an inlet and an outlet.that go directly into the heater core. Sometimes the heater core is clogged. disconnect the hoses and use a water hose running at only a moderate flow. put it into one of the the inlet of the heater core and run water until you see clear coolant. Then do it on the outlet and run it until the coolant is clear. you are trying to remove any clogs the heater may have. if this does not work, check the heater control valve.move the temperature slider the one to control the temp inside the car. and see if you can hear anything move. Check to see what type it is it can be a vacuum controled vavle, or a cable hooked on to the valve or an electronic controled valve. if it is a vacuum controled valve, you can check to see if a vacuume hose is disconnected, if it is a cable type valve,check it by moving the temperature control inside the car open it and close it with your fingers if you can see it. But most likely it may be the heater core thats clogged.

Nov 30, 2008 | 2000 Lincoln LS

1 Answer

1999 Mustang heater problem

The heater/AC temp control blend door is warped and sticking, this is a very common problem in this series of mustang, in order to fix it the dash must be removed.

Nov 17, 2008 | 1999 Ford Mustang Cobra

Not finding what you are looking for?
Cars & Trucks Logo

305 people viewed this question

Ask a Question

Usually answered in minutes!

Top Toyota Experts


Level 3 Expert

78267 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22326 Answers

Jeffrey Turcotte
Jeffrey Turcotte

Level 3 Expert

8836 Answers

Are you a Toyota Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides