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Re: How do I drop dash to replace heater core?
I don't know about your model year, but even on my 97 the manual claims that much of the dash has to be removed, involving a considerable amount of work. However, based on others experience and recommendation, I found I could replace the heater core by just dropping the heater/ A/C units bottom section. I couldn't believe how much simpler it was than removing so many other components that the shop manual called for. Check things out completely before ripping the dash apart.
If the dash is removed you've saved about 9 10ths of the job endurance. Look around, what you believe to be, the perimeter of the heater box. I cannot, and no one else can, tell you exactly where the bolts and nuts that mount the heater box are. Therefore you must viually sixe the box and check outide in the engine compartment and inside under the dash for the mounting bolts.You'll want to start by removing the heater hoses. Then starting at the passenger side engine compartment look for a group of 10mm or 7/16ths nuts retaining the housing and remove them. Do the same inside. The housing is usually held together with screws or clips, it changes year to year. Keep a log or pix of the wires and cables and hoses(vacuum) that are connected to the housing for reassembly. You'll need to "roll" the box out from under the dash depending on how much of the dash has been removed. The core is easy to spot for is has two hoses sticking out, and, is encircled with clips or screws . Also make sure you remove the bracket around the two entry hoses if it has one. Thank you, Dana
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.
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Not an easy job. Drop the steering column and remove the dash first. Then remove the plenum. Core is between the plenum and fire wall. Get a manual. Your saving hundreds doing it your self. 30 dollars for a manual is worth it.
Find the 2 hoses going to the firewall. That's your heater core. Now how you take it out is another story. Look under the dash at the same location. You may be able to see it by removing the door of the glove box. Most likely the whole dash will have to be dropped to remove it. If your lucky you will see a cover plate and have room enough to work. otherwise this can turn into a major job, Good Luck
i just pulled my heater core from my 97 dakota. first pull the negitive cble from the battery next start with pulling all the plastic from the dash and kick pannels. Next yu need ti pull the bolts from the dash and under the dash. third drop the stering wheel and let it set in the seat. Forth you need to pull your heater hose lines loose from the heater core and your evaporater from the cooler. next you need to pull the passenger side of the dash out about one and a half feet to get the heater box out and to put it back together go in rev the way you took it out.
this repair is very extensive if you have limited ability then do not attempt,,,,,, the steering column has to be dropped. entire dash removed, ac freon recovered coolant drained below core then the heater box assembly has to be removed as a whole then disassemble heater box to replace the core then reverse procedure.
will require about 12 hours to do,you need to drop steering wheel and shaft assembly,you need to remove the entire dash from van,then you get to heater box assembly,there is another 2 hours,then you get to the heater core,
Heater core is located underneath the dash inside the air box on the right side of the truck.. you will need to have the a/c system discharged by a qualified repair facility before beginning. you will need to drop the steering column and remove the entire dash assembly. You can cheat in places but GM puts a few bolts in precarious places. Heater core hoses will need to be disconnected and cooling system drained.
2000 GMC Jimmy heater core replacement
in order to replace a heater core in a 2000 gmc jimmy the coolant must
be completely drained and the entire dash including radio, vents and
panel covers must be removed. four screws hold the top portion(closest
to the windshield) in place. they can be found under the windshield
defrost vent. after the entire dash is removed a safety harness under
the steering column must be removed and the steering column must be
dropped to the driver seat. the heater core housing(black plastic) is
located right center of the dash and is a two part housing one piece on
top of the other. the housing is attached to the fire wall and must
detached before replacement can continue. after detaching the housing
from the fire wall separate the housing by unscrewing the six screws
that hold it together. the heater core is now exposed. disconnect the
heater core from the two hoses and discard. installation is the uninstall process in reverse.
it is a very long and drawn out process that is not accomplished in
just an hour or two . make sure you have most of the day or several
afternoons to finish . Good luck and take pictures with your cell phone to use as reference.
very large job by the look of it, can download workshop manual from pdftown.com
degas air cond, drop coolant, remove dash, reomve front seats, remove console, remove heater and evaporator case assembly then get to replace heater core.
as i said big job.