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it is located under the dashboard against the firewall of the passenger seat. i recomend buying a repair manual from your local auto parts store before attempting as it requires draining, flushing, refilling and bleeding the cooling system as well as removing many other componets like the entire dashboard and thermostat
No, you don't have to pull the whole dash board but you have to pull a few panels....here is the steps on how to get to it and remove and replace it:
Disconnect the negative battery cable.
Drain the cooling system and disconnect the heater hoses from the heater core tubes. Plug the hoses and the heater core tubes to prevent coolant leakage.
NEVER open, service or drain the radiator or cooling system when hot; serious burns can occur from the steam and hot coolant. Also, 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 quantities. Always drain coolant into a sealable container. Coolant should be reused unless it is contaminated or is several years old.
Remove the 3 nuts located below the windshield wiper motor attaching the left end of the plenum to the dash panel. Remove the 1 nut retaining the upper left corner of the evaporator case to the dash panel.
Plenum removal—1990-98 vehicles
Disconnect the vacuum supply hose(s) from the vacuum source. Push the grommet and vacuum supply hose(s) into the passenger compartment.
Remove the right and left lower instrument panel insulators.
On 1989 vehicles:
Remove the 3 glove compartment hinge screws, disconnect the check arms and remove the glove compartment.
Loosen the right door sill plate and remove the right side cowl trim panel.
Remove the bolt attaching the lower right end of the instrument panel to the side cowl.
Remove the instrument panel pad as follows:
Remove the 2 screws attaching the pad to the instrument panel at each defroster opening. Be careful not to drop the screws into the defroster openings.
Remove the one screw attaching each outboard end of the pad to the instrument panel.
On Crown Victoria, remove one pad attaching screw near the upper right corner of the glove compartment door.
Remove the 5 screws attaching the lower edge of the pad to the instrument panel. Pull the instrument panel pad rearward and remove it from the vehicle.
On 1990-98 vehicles:
Remove all instrument panel mounting screws and pull the instrument panel back as far as it will go without disconnecting any wiring harnesses.
Make sure the nuts attaching the instrument panel braces to the dash panel are removed.
Loosen the right door sill plate and remove the right side cowl trim panel.
If equipped with manual air conditioning, disengage the temperature control cable housing from the bracket on top of the plenum. Disconnect the cable from the temperature blend door crank arm.
If equipped with Automatic Temperature Control (ATC), proceed as follows:
On 1989 vehicles, disconnect the temperature control cable from the ATC sensor.
Detach the vacuum harness line connector from the ATC sensor harness and detach the electrical connector from the ATC servo connector.
On 1990-98 vehicles, remove the cross body brace and disconnect the wiring harness from the temperature blend door actuator. Detach the ATC sensor tube from the evaporator case connector.
Detach the vacuum jumper harness at the multiple vacuum connector near the floor air distribution duct.
Disconnect the white vacuum hose from the outside-recirculating door vacuum motor.
Floor air distribution duct removal—1990-98 vehicles
Remove the 2 hush panels.
Remove 1 plastic push fastener retaining the floor air distribution duct to the left end of the plenum.
Remove the left screw and loosen the right screw on the rear face of the plenum and remove the floor air distribution duct.
Remove the 2 nuts from the 2 studs along the lower flange of the plenum.
Heater core removal—1990-98 vehicles
Carefully move the plenum rearward to allow the heater core tubes and the stud at the top of the plenum to clear the holes in the dash panel. Remove the plenum from the vehicle by rotating the top of the plenum forward, down and out from under the instrument panel. Carefully pull the lower edge of the instrument panel rearward, as necessary, while rolling the plenum from behind the instrument panel.
On 1989 vehicles with ATC, remove the ATC servo from the plenum.
Remove the 4 retaining screws from the heater core cover and remove the cover from the plenum assembly.
Pull the heater core and seal assembly from the plenum assembly.
Carefully install the heater core and seal assembly into the plenum assembly. Visually check to ensure that the core seal is properly positioned. Position the heater core cover and install the 4 retaining screws.
On 1989 vehicles with ATC, install the ATC servo on the plenum.
Route the vacuum supply hose through the dash panel and seat the grommet in the opening.
Position the plenum under the instrument panel with the register duct opening up and the heater core tubes down. Rotate the plenum up behind the instrument panel and position the plenum to the dash panel. Insert the heater core tubes and mounting studs through their respective holes in the dash panel and the evaporator case.
Install the 3 nuts on the studs along the lower flange and one on the upper flange of the plenum. Install the 3 nuts below the windshield wiper motor to attach the left end of the plenum to the dash panel and the one nut to retain the upper left corner of the evaporator case to the dash panel.
Position the floor air distribution duct on the plenum. Install the 2 screws and plastic push fastener. If removed, position the panel door vacuum motor to the mounting bracket and install the 2 attaching screws.
Connect the white vacuum hose to the outside-recirculating door vacuum motor. Attach the vacuum jumper harness to the plenum harness at the multiple vacuum connector near the floor air distribution duct. Install the floor duct.
If equipped with manual air conditioning, connect the temperature control cable housing to the bracket on top of the plenum and connect the temperature control cable to the temperature blend door crank arm. Adjust the temperature cable.
If equipped with ATC, proceed as follows:
On 1989 vehicles, connect the temperature control cable to the ATC sensor and adjust the cable. Route and attach the vacuum harness connector to the ATC sensor and attach the electrical connector to the ATC servo connector. Do not block the sensor aspirator exhaust port with the excess vacuum harness. Install the ATC sensor tube between the sensor and the evaporator connector.
On 1990-98 vehicles, attach the ATC sensor tube to the evaporator case connector. Install the cross body brace and connect the wiring harness to the blend door actuator.
Install the bolt to attach the lower right end of the instrument panel to the side cowl. Install the right side cowl trim panel and tighten the right door sill plate attaching screws.
On 1989 vehicles, install the instrument panel pad and the glove compartment door. On 1990-98 vehicles, push the instrument panel back into position and install all instrument panel mounting screws. Install the right and left lower instrument panel insulators.
Connect the vacuum supply hose(s) to the vacuum source.
Install the right and left lower instrument panel insulators and install the 2 hush panels.
Unplug the heater core tubes and the heater hoses and connect the heater hoses to the heater core tubes. Fill the cooling system.
Connect the negative battery cable and check the system for proper operation.
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).
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most heater cores are behind the dash board on the passenger side.Look inside your engine u will see two hoses running to the firewall on the passenger side.They r going to your heater core.Sometimes you have to remove the dashboard completely it all depends on the car.
WOW, sorry it has taken so long for someone to see and respond to your question. You've probably figured it out on your own by now, but if not, here is your answer. The heater core in your Caprice is located behind the glove box. To gain access, you have to remove the lower right dash insulator panel (below the glove box) and than the glove box. Remove any vaccuum lines ( mark their locations.) Then remove the lower instrument panel brace and then the heater core cover. Remove the heater core clamp bolt and clamp. Disconnect the heater hoses from the heater core on the left hand side of the engine compartment( looking at the engine from the front of the car.) Then remove the heater core.
did you change your in cabin air filter? It is located behind the glove box. When this gets clogged the air flow is much less. Remove glove box by removing one screw on limit strut, then squeeze sides of glove box together and remove. The filter is located behind the removable rectangular panel through the glove box opening. carefully pull out the filter, noting air flow direction on filter, you don't want leaves and other debris to fall into the blower motor. You can no replace the filter, or blow the dirty one out with compressed air. The filters are less than $10.
You can make an easy test of the heater core by touching the inlet and outlet hoses. The temp of the hoses should be about the same with the engine running and the heater in the off position.
Lastly pressure check or replace the radiator cap. Make sure the hose to the coolant recovery tank is not cracked or leaking; if it were you could get air in the cooling system, this would cause the trouble you describe.
Yes dash will have to be removed, also if your a/c works the a/c system will have to be evacu, vacumm and recharge, remove and replace or repair heater core flag time is 5.9 hrs. hope this was helpful.
The heater core is located in the heater box. To get to the heater box you must first remove the dash. Then remove the heater box from the firewall. Then seperate the box to get to heater core. Good luck.
it is located behind the glove box. remove the screw holding the strut on the glove box. Squeeze sides of glovebox together to remove from dash. look into hole where the glove box was There is a removable panel for the air filter. take it out and pull out the filter. make sure you note which way the filter is oriented. push in new filter and replace cover and glove box.