Question about 1998 Lincoln Mark VIII

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My Mark VIII heater core leaked and I by-pasted by removing the hose and reconnected back to the engine. Why does the heater core still leak water and everyday I have to add water.

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You have to remove the both hoses and join them together .You still have one connected thats why its still leaking.

Posted on Jun 03, 2009

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Because there probably is a small hole in the heater core and checkout these websites to see if they have your car listed www.autozone.com and the other one is www.alldatadiy.com and if all fails stop by your local library and get your hands on a Haynes auto repair manual for your car.

Posted on Jun 03, 2009

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4 Answers

My antifreeze is leaking and I am trying to find the leak. It also leaks from inside of my truck on the passenger side where their feet are.


Your heater core is leaking. Replacement of this part is a big job and should be done by a professional.

Jan 12, 2013 | Cars & Trucks

1 Answer

98 ply breeze heater blows cold air, replcd water pump, radiator, thermostat, filled w/coolant, no leaks inside car, both h/c hoses are warm, bled coolant system, fans work. Would the heater core be...


Yep! Take the heater hoses loose from the engine(one at water pupm\\mp and other one at thermostat housing area usually). Then take your water hose at your house,with a common old pistol grip nozzle,and spray water back thru the heater hose you took off the water pump side and that will force it back thru the heater core and out the hose you took off the thermostat side.
If you want to see the junk that flies out of it,tie a white rag or old tee shirt onto the end of the hose.You'll be amazed what flies out of there.Reconnect your heater hoses and see how it does.
I always fill the hose full of water so when I reconnect them,they don't have any airlock problem. don-ohio (:^)

Nov 07, 2011 | 1998 Plymouth Breeze

2 Answers

Water leaking onto passenger side floorboard,soaking the carpet


Your heater core has developed a leak - the wetness on the passenger side carpet is engine coolant
from a heater core leak, or a leak in one of the two hoses connected to the back of the heater core.
Your strategy: disassemble dash down to heater core, determine whether you'll need a new heater
core or new hose (or new hose clamp), then replace the offending part.

Jul 20, 2011 | 2005 Chrysler Town & Country

2 Answers

Leaking antifreeze between firewall and motor on passenger side. just started when i tried to use the heater. could it be the heater core and where is it located


Could be the heater core, or where your heater hoses connect at the firewall. Heater core leak would more than likely put steam in the vents of you car when heater is on and hot and fan on. If the leak is just in the engine compartment, it`s a hose or a loose connection.

Apr 18, 2011 | 2002 Pontiac Montana

1 Answer

My heater does not work ,but the ac work fine.


it could possibly be that the heater core is clogged. locate the two hoses connected to the heater core they will be on the passenger side of the car coming out of the firewall into the engine compartment. remove the hoses at the end not connected to the heater core and with a garden hose with a pressure nozzle on it blow water through the core, then blow the opposite direction. water should flow freely in both directions. if it is clogged this should fix it.

Apr 18, 2011 | 1997 Lincoln Mark VIII

2 Answers

Smoke coming from a/c vents on ford expedition with sweet smell


The problem is the heater core leaking behind the dashboard. Heater Core Removal & Installation 1997-2002 To Remove:
NOTE: Heater core must be vacuum leak tested before it is remove from vehicle if a heater core leak is suspected.
  1. Drain engine coolant.
  2. Remove instrument panel.
  3. For 5.4L (4V), if quipped, remove junction splash shield.
  4. For 5.4L (4V), if quipped, disconnect starter relay cable. ford-03-00-3579.gif

  5. For 5.4L (4V), if quipped, remove junction block bracket.
  6. Clamp inlet and outlet heater hoses.
  7. Disconnect heater hose from heater core by gently pressing it toward heater core.
  8. Remove A/C plenum demister adapter.
  9. Disconnect vacuum line.
  10. Remove 13 plenum chamber top screws.
  11. Remove blend door assembly from case.
  12. Remove heater core.
To Install:
NOTE: If needed, clean and lubricate coolant hoses with plain water.
ford-10-00-3098.gif

  1. Install heater core.
  2. Install blend door assembly to case.
  3. Install 13 plenum chamber top screws.
  4. Connect vacuum line.
  5. Install A/C plenum demister adapter.
  6. Connect heater hose to heater core.
  7. Release all clamps from inlet and outlet heater hoses.
  8. For 5.4L (4V), if quipped, install junction block bracket.
  9. For 5.4L (4V), if quipped, connect starter relay cable.
  10. For 5.4L (4V), if quipped, install junction splash shield.
  11. Install instrument panel.
  12. Refill engine coolant.
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Aug 17, 2010 | 1999 Ford Expedition

1 Answer

How do you remove the heater core from a 1997 ford f-150


Heater Core Removal & Installation To Remove:
NOTE: If a heater core leak is suspected, the heater core must be leak-tested before it is removed from the vehicle.
  1. Remove or disconnect the following:
    • The negative battery terminal
    • Engine coolant
    • The instrument panel Heater Hoses for_f150_conn_tabs_htr_hses.gif

    • The heater water hoses at the heater core
      1. Compress the holding tabs
      Remove the A/C plenum demister adapter for_f150_dmstr_adptr_rem.gif

    • The screw
    • The A/C plenum demister adapter Disconnect the vacuum line. for_f150_vac_line_rem.gif

    • Vacuum line Remove the heater core bracket. for_f150_htr_core_brckt_rem.gif

    • The screws
    • The bracket Remove the plenum assembly top for_f150_plnm_case_top.gif

    • The 13 screws
    • The plenum chamber top Blend door assembly for_f150_blnd_door_assmbly.gif

    • The blend door assembly from the case
    • The heater core
To Install:
NOTE: Lubricate the coolant hoses with MERPOL(R) meeting Ford specification ESE-M99B144-B or plain water only, if needed.
  1. Install or connect the following:
    • The heater core
    • The blend door assembly into the case Blend door assembly for_f150_blnd_door_assmbly.gif

    • The plenum chamber top
    • The 13 screws
    • The bracket
    • The screws
    • Vacuum line
    • The A/C plenum demister adapter
    • The screw
    • The heater water hoses at the heater
    • Engine coolant
    • The negative battery terminal
prev.gif next.gif

Jun 20, 2010 | Cars & Trucks

1 Answer

No heat before or after replacing thermostat


Remove both of the heater core hoses. Using a water hose, force water through the heater core in the smaller hose connection first. Chuncks of rust or mud looking stuff can plug the core. Move the hose to the other connection then go back and forth a few times until the core is clear of debris.

Check the engine for coolant leaks before doing anything. Fix any leaks. Check the intake gaskets and the radiator cap.

Dec 06, 2009 | 2000 Chevrolet Blazer

1 Answer

1979 lincoln mark v water leaking from black box on passanger side what could cause this


Heater core has sprang a leak or the hoses are leaking that go to the heater core. Chances are if that is the original heater core it has a leak. Very common as vehicles get older. Has happened to me and my customers numerous times.

Jun 04, 2009 | 1979 Lincoln Mark V

1 Answer

Water leaking fron back of engin


its a intake manifold or the heater core return hose to the rear of intake

Oct 21, 2008 | 1999 GMC Yukon

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