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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.
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.
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 1990-00 vehicles:
Remove the cross body brace and disconnect the wiring harness from the temperature blend door actuator.
Disconnect the ATC sensor tube from the evaporator case connector.
Disconnect 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.
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.
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.
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.
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. Connect 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:
Connect the temperature control cable to the ATC sensor and adjust the cable. Route and connect the vacuum harness connector to the ATC sensor and connect 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.
Connect 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.
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. I hope this helps. Don,t forget to rate my answer.
Hello Callahan5922....this sounds like a stuck blower motor resistor. I assume the blower won't function in the a/c mode either? If you have a digital multimeter you can check this. I believe it's fuse #2....if the digital indicator goes up or down when you increase or decrease the fan speed thats good. Locate the blower motor resistor....you wil find it located on the fire wall behind the right valve cover hiding behind the heater hose, it's about the size of a cigarette pack. With the engine off, and key in on position, turn the A/C on High, and rap a tap tap tap on the resistor. You might be suprised when the blower motor takes off a runnin, I hope this is the answer you need and i was able to help solve this for you. Good luck...
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At the rear center or the cover is 1/4" square drive headed bolt -remove using your 1/4" ratchet with a 1/4" extension . lift rear of cover and push cover forward off the two horizontal tabs facing forward in front. reattach in reverse order.
if you have the V8 gas engine, the cylinders on the passenger side from front to back are #1 #2 #3 #4 the cylinders on the driver side are from front to back #5 #6 #7 #8. if you have a V6 gas engine the cylinder placement is passenger side from front to back #1 #3 #5 the cylinders on the drivers side are from front to back #2 #4 #6. if you have a diesel V8 engine the cylinder placement is passenger side from front to back #1 #3 #5 #7 drivers side from front to back #2 #4 #6 #8 and last but not least if you have the V10 the cylinder placement is passenger side from front to back #1 #2 #3 #4 #5 and driver side from front to back #6 #7 #8 #9 #10.
Ford vehicles usually have a small hole under the ignition lock cylinder that allows access to the release for the cylinder. I assume Lincoln has a similar setup. Turn the ignition to on and locate the small hole in the steering column trim, use a long thin punch and stick it in the hole depressing the release. You should be able to gently pull the lock cylinder out now.