Question about 1999 Ford Expedition

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99 expedition rear heater core line bypass?

I have a 99 expedition that is leaking coolant from a line on the passenger side towards the back. This is causing the car to overheat. I think it is one of the lines for the rear heater core. If I bypass the rear heater core, will it solve the problem for now, or do I have to replace the lines? Thank you!

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  • Ford Master
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You have to replace them or you can bypass them but there will be no heat in the back did someone put stop leak in if so it clogs the whole system up and causes the weak spots to let go is the heater core clogged most likely and replacement with new lines is a + for the truck and passengers if the leaks from vibration causing the line to rub away then just replace the line depending on the size of it you might be able to use a compression union X2 and a new line but if it's stop leak it has to be flushed a real lot and still that stuff will be in there you must drain the whole system and use phosphoric acid it will get that out and it's available at home Depot or you could use Pepsi or coke it's in theregards and I'm not joking it works also lemon juice and water but mistly juice will eat that stuff then baking soda to neutralize the acid works the truck has to run e couple of hours with it then a high pressure force flush with clean water also laundry detergents work but take longer and sometimes rust will start but could be used after everything else again followed by a high pressure flush for about 15 min so good look I'm not there so I can only tell you probable causes you have to know if the stop leak is in there it either looks like sand or like a redish brown gunk I hope for your sake that this is not the case it's very troublesome to get out and if your mechanic did it it's even worse troublesome because he or she is supposed to know better then to use that unless they are dishonest and that stuff will keep you coming back for more repairs and more $$$$$$$$for them good luck again stephen

Posted on Jan 03, 2018

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6 Suggested Answers

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Posted on Jan 02, 2017

virgils
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SOURCE: diagram bypass heater cord on 2001 ford expedition eddie bauer

the heater bypass is quite simple, if you look at the firewall you will see two medium sized coolant lines, remove them from the firewall and link them together using a proper sized tube, you can purchase a kit at a parts store quite cheaply

Posted on Oct 11, 2008

  • 1 Answer

SOURCE: 99 ford expedition front heater core location

I have a coolant leak inside my expedition and it is coming through the vents does this mean that it is the heater coil

Posted on Jan 29, 2009

  • 1201 Answers

SOURCE: Diagnostic Codes p0171 bank 1, and p0174 bank 2 (too lean)

Those codes are for the oxygen sensors, lean fuel mixture on both banks. Change them, problem with stalling and rough idle should go away.

Posted on Apr 23, 2009

  • 532 Answers

SOURCE: Where is the heater core hose in my 2000 ford expedition?

check closer to just underneath the firewall--it could be a smaller problem than a heater core--Ford 4.6--5.4 engines have a tube just underneath the intake manifold that the rubber hose goes bad and it will leak towards the back of the engine.Lets hope so-what i hear its very expensive to change a heater core in an Expedition.

Posted on May 01, 2009

  • 532 Answers

SOURCE: 98 Expedition coolant leak top back of engin

Sorry im late with this,i couldnt seem to log on....The answer to your question is YES,there is a steel line under the intake with a short piece of rubber line attached to it and you can just about see it from the front of the intake with a light,it can leak and cause coolant to run off the back of the engine,The intake gasket set alone is about $40.00 and i dont know about the rubber line,i have seen it physically but havent changed one yet.Note the date of manufactor just incase,i bought an intake set for a 99 and the engine design was changed half way through...its not too hard to pull off the intake and re-install,you will need a 7mm socket for the coil packs,8mm socket for the fuel rail bolts and lower intake bolts and power steering bracket bolts and throttle bracket bolts,10mm socket for the intake bolts and alternator bolts and egr valve,and a large cresant wrench for the exhaust tube thats connected to the egr valve,flat screw driver for the air cleaner...and plenty of extensions with a swivel to be able to get to the back bolts of the intake....just incase you do it yourself this info could make it easier to gather tools.Its about a 3 1\2 to 4 hour job start to finish for the first time doing it,includes cleaning everything..Good luck

Posted on May 16, 2009

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1 Answer

Coolant leaking from back where spare tire is in 1998 ford expeditin


Of course you have a heater core in the rear on the left side. And you could have a leak in one of the lines going to the core. Get under the EX with a light and look carfully for a rusted line.

Sep 24, 2012 | 1998 Ford Expedition

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99 grand caravan ..carpet is soaking wet on passenger side and in to the rear on the passenger side. I bypassed the heater core on the drivers side but still continues to leak water and antifreeze. Is...


Under the hood is a drain for the cowling under the wiper arms. There is a plastic tube that gets clogged and water can't drain from that area. It is against the firewall on the passenger side. I found mine full of pine needles

Aug 28, 2011 | 2001 Dodge Grand Caravan

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Have to what seems to be a radiator leek on passenger side right in front of rear tire. I looked underneath and saw rubber "coolant" lines right above the spring? My question is: is this part of...


Hi, this is the heater core for your rear heater. If it's leaking from inside the box, it's likely the core is bad. Please let me know if you would like instructions for replacing the rear heater core. A new core is $92 at autozone, but I would shop around. Make sure you specify the rear or auxiliary when ordering a new new core, as the front core is different.

May 28, 2011 | 2000 Dodge Caravan

1 Answer

Water leaking from back of engine compartment toward the firewall passenger side down to side of transmission so my question is it the bypass hose? or something else


More likely the heater hose. Most run back behind the glove box. It could also be a leak in the heater core- normally that would fog the windshield on the inside.

Feb 08, 2011 | 2001 Ford Expedition

1 Answer

Diagram on how to replace heater core in 99 expedition


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 21, 2010 | Ford Expedition Cars & Trucks

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

2 Answers

My van is over heating there is coolant and water in the radiator it started leaking underneath towards where the front passenger seat


The problem sounds like either the inlet or outlet hose to the heater core is cracked or split. Or the heater core itself is at fault. Need to inspect the hoses from engine to the firewall going to the heater core for damage. If no leak from the outside then problem will be on the inside under the dash. Hope this will help you.

May 31, 2010 | 1998 Dodge Caravan

3 Answers

Coolant leaking at back of engine,could it be the heater core


the heater core leaks inside the car, it is either a hose or a core plug.

Sep 30, 2009 | 1994 Toyota Land Cruiser

1 Answer

Where are the heater core hook ups


The heater core is located on the passenger side of the vehicle. If this has been bypass the core is surely leaking. The heater core pipes should be visible from un der the hood, passenger side of vehicle towards the firewall. keep me posted, and keep an eye on that heater core, there is reason for the prior owner not to have heat.

Dec 19, 2008 | 1991 Oldsmobile Ninety Eight Regency

2 Answers

99 ford expedition front heater core location


behind glove box look under hood on pasnger side for two hoses going in to fire wall this is where your heater core will be located if you need more help call me at 850-791-4498

Dec 05, 2008 | 1999 Ford Expedition

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