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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I'm confused, the heat still comes out but not on the window, are you saying the heat blow out air but not to the front glass? the air comes out on the floor but not the top of the dash for the front windsheild. if this is the problem then it sounds like the selector door is not moving. this car is listed as a 2000 daewoo. you will need to look under the dash at the heater box, you will look on both sides, from the pass/side and driverside. you will then move the selector control, this is the control that controls the location that the heat comes out of, you will locate door this way,by moving control to see if door is moving or linkage broke or if operated by actuator motor to see if motor is operating, hope this helps good day.
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.
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...
Heater Core - REMOVAL & INSTALLATION (see Figure 1)
Drain the cooling system.
Remove the heater unit assembly. Have alot of towels handy for the leakage of coolant that may spill into your interior.
Remove the fasteners securing the core to the unit, remove the plates and clamps. Pull upwards to remove the core from the unit.
Inspect the core fins for any blockage. Using compressed air, clean them.
Install the core into the unit placing the plates and clamps into position. Tighten the core screws.
Install the heater unit into the vehicle.
Fill the cooling system.
Fig. 1: Exploded view of the heater unit assembly-1996 4Runner shown
Heater Unit - REMOVAL & INSTALLATION (see Figure 1)
Have alot of towels handy for the leakage of coolant that may spill into your interior.
Discharge the A/C system (if applicable), using an approved recovery/recycling machine.
Remove the cooling unit (if applicable).
Drain the cooling system.
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.
Disconnect the hoses to the heater core. Tag each one so that it may be correctly reinstalled.
On some models you will need to remove the glove box assembly. On others, the instrument panel and reinforcement.
At the heater case under the dash, disconnect the ductwork from the case.
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.
Disconnect the wiring harness to the blower fan.
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.
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.
Connect the wiring harness to the blower fan.
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
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.
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.
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.
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.
Install the glove box and/or instrument panel assembly.
Connect the heater hoses. Use new clamps.
Install the cooling unit (if equipped).
Refill the coolant, then charge the A/C system (if equipped).
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.
Check to see that the blend door linkage is hooked up. Doubtful it is heater core, as you had heat to one side and not the other. Check coolant control valve linkage, verify it is moving the coolant valve from off to on when you switch temperature from cold to hot. Verify you have coolant flow to the heater core by feeling the heater hoses where they enter the firewall. If all checks out well, then look at hvac controls individually.
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.
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