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How do I bypass the heater core in my 2002 Lincoln Ls?

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  • Lincoln Master
  • 3,519 Answers

Hi Tommy:
I'm not quite sure why you would want to do this as you won't have any defog/defrost function for your windshield.
As a temporary measure, you can do the bypass by finding the hoses that go into the heater. You can disconnect them and plug them, disconnect them and connect them together, or disconnect them, then remove one of them from and loop the other to where the removed one was connected. Any of these will work as a temporary emergency fix that will get you home or give you time to get a new core. SAFETY FIRST!!! Engine coolant can be HOT and it is sometimes under PRESSURE. Only work on this when the engine is cold, and loosen the radiator cap to make sure there is no pressure before you start.

Posted on Apr 02, 2015

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: 2000 lincoln ls heater not working...thermostat?

- If temp guage reads normal, the lack of heat may be due to the Heater Control Valve. Located in front of the radiator. Lower passenger side. A real bugger to replace.
- The plastic cap just over the thermostat is key in re-filling the anti freeze and bleeding air.

Posted on Dec 25, 2008

chrischronic
  • 235 Answers

SOURCE: 2002 LINCOLN LS V6 3.0 PCV VALVE LOCATION

it is down under the intake manifold. the intake manifold must be removed to get to it. this vehicle is known for developing a vacum leak in the elbow hose that connects to pcv valve, so ive done a few.

Posted on Feb 19, 2009

  • 333 Answers

SOURCE: Heater core - 1996 Lincoln Town Car

  1. Disconnect the negative battery cable.
  2. 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.
  3. 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.
  4. Disconnect the vacuum supply hose(s) from the vacuum source. Push the grommet and vacuum supply hose(s) into the passenger compartment.
  5. Remove the right and left lower instrument panel insulators.
  6. On 1990-00 vehicles:
    1. Remove the cross body brace and disconnect the wiring harness from the temperature blend door actuator.
    2. Disconnect the ATC sensor tube from the evaporator case connector.
  7. 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.
  8. Remove the 2 hush panels.
  9. 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.
  10. Remove the 2 nuts from the 2 studs along the lower flange of the plenum.
  11. 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.
  12. 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.
To install:
  1. 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.
  2. Route the vacuum supply hose through the dash panel and seat the grommet in the opening.
  3. 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.
  4. 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.
  5. 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.
  6. 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.
  7. 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.
  8. If equipped with ATC, proceed as follows:
  9. 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.
  10. On 1990-00vehicles:
    1. Connect the ATC sensor tube to the evaporator case connector.
    2. Install the cross body brace and connect the wiring harness to the blend door actuator.
    3. 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.
  11. Connect the vacuum supply hose(s) to the vacuum source.
  12. Install the right and left lower instrument panel insulators and install the 2 hush panels.
  13. Unplug the heater core tubes and the heater hoses and connect the heater hoses to the heater core tubes. Fill the cooling system.
  14. Connect the negative battery cable and check the system for proper operation. I hope this helps. Don,t forget to rate my answer.

Posted on Mar 01, 2009

  • 382 Answers

SOURCE: bad heater core on my 2001 lincoln navigator

This is definitely not a job for the at home mechanic. the dash will probably have to come out and this is a very time consuming and laborious task. I would recommend you find a job that you can trust, or get several estimates on the work before you decide who to let do the work. I would expect something like this to run at least $700.00 to $1000.00

Posted on Dec 08, 2009

  • 145 Answers

SOURCE: battery location in 2002 lincoln ls

It is in the trunk under the carpet with the spare tire.

Posted on Jan 13, 2010

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