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Posted on Jan 08, 2009
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How do i remove the heater core in a 1988 F250 pickup

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gerry bissi

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  • Ford Master 4,390 Answers
  • Posted on Jan 09, 2009
gerry bissi
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Joined: Jan 07, 2009
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I don't have that old of a shop manual but you usually have to open up the heater plenum case under the dash to acess the heater core. The disconnect fr the heater hoses is under the hood at the fire wall near the passenger side.

1996 version

Heater Core Removal

  1. Allow the engine to cool. Observe the safety precautions in Section 03-03 .
  1. Place a thick cloth over the radiator cap. Turn the cap slowly to its first stop to release system pressure. When the pressure has been released, tighten the radiator cap.
  1. Disconnect the heater water hoses (18472) from the heater core (18476). Plug the hoses.
  1. Remove the glove compartment.
  1. From inside the passenger compartment, remove the seven screws that attach the heater core cover (18B300) to the heater air plenum chamber (18471).
  1. Disconnect the vacuum source. Leave the A/C plenum vacuum harness (18C581) attached to the heater core cover. Remove the heater core cover.
  1. Remove the heater core from the heater air plenum chamber.
good luck

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1994 F-250 Heater Core
Answer for a 1995 F250:

Remove the glove-box door. Behind that is the heater core cover on the interior, passenger side of the firewall. Remove that cover and there is the heater core. Open the hood and look where the heater hoses enter the front right passenger area of the exterior side of the firewall. Disconnect the two heater hose clamps and you can then remove the heater core.
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Jan 13, 2012 • 1994 Ford F250 Supercab
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How do I replace my heater core on a 1988 my Ford f250
Hello there, here are steps to help you through:
  • Disconnect the negative battery cable.
  • After making sure the engine is cool, drain the coolant from the radiator into a suitable container for recycling. It is always good practice to replace the coolant with fresh coolant after replacing the heater core. The old coolant will contain corrosives and contaminants that will accelerate deterioation of the new core if you reuse it.
  • Disconnect the heater hoses from the heater core connector pipes on the engine side of the firewall.
  • Working in the passenger compartment, remove the glove box for better access.
  • Still working in the passenger compartment, remove the seven screws that attach the heater core cover to the plenum assembly (the plenum assembly is the protective housing into which the heater core is mounted.)
  • Disconnect the vacuum source but leave the vacuum harness attached to the plenum cover.
  • Remove the plenum cover.
  • Remove the heater core from the plenum chamber.
  • Reverse the procedure to install the new heater core.
  • Make sure the radiator drain plug is closed, that the heater hoses are properly tightened.
  • Make sure the new coolant is properly mixed with an equal amount of clean water (distilled water recommended) to produce a 50/50 coolant/water mixture.
  • Fill the radiator with the proper type and amount of fresh 50/50 coolant..
  • Start the engine and check for leaks.
  • Check the coolant level after driving the first few miles and top off the coolant level (after engine cools).
Hope I could be of help. Best of luck
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Jan 12, 2011 • 1988 Ford F 250
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Could be a bad heater core.Could be clogged up.
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Nov 15, 2017 • 1988 Toyota Pickup
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How to replace heate core 1988 buick reagal
REMOVE OR DISCONNECT
  1. Negative battery cable.
  2. Drain cooling system.
  3. Upper firewall weatherstrip.
  4. Upper secondary cowl.
  5. Heater hoses from core.
NOTE Blowing out residual coolant from inside the heater core will prevent coolant leakage into the passenger compartment when the heater core is removed.


  1. Sound insulator.
  2. Rear seat duct adapter.
  3. Heater duct.
  4. Heater core cover.
  5. Heater core.
INSTALL OR CONNECT

  1. Heater core.
  2. Heater core cover.
  3. Heater duct.
  4. Rear seat duct adapter.
  5. Sound Insulator.
  6. Heater hoses to core.
  7. Upper secondary cowl.
  8. Upper firewall weatherstrip.
  9. Fill cooling system and check for leaks.
  10. Negative battery cable.

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Oct 21, 2010 • 1988 Buick Regal
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I replaced heater core on my 1995 ford pickup f250 truck a hoses look fine but i do not get any heat in the cab
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it had a short and cot on fire, put out and drove off, need to replace
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Sep 29, 2009 • Ford F-250 Cars & Trucks
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I have a heater core blowing steam on the wind sheild.On my 2001 Dodge Pickup 1500 4x4 with a 360.How do i go about changing it.
first you have to remove the complete dash . recover the refrigerent for the a/c. I would advise replacing the heater core AND the evaporator at the same time. Dodge trucks are very common for both and you dont want to do the core and then a few months later the same job over again.
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...good luck,,,marty
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May 22, 2009 • 1988 Toyota Pickup
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Ford 1988 f250 will not start up.
Pass side inside on the fire wall inside by the heater core just below it. There's a black box with white botton on top. Push the white button downword to reset the fuel pump.

For the fuel filter, you'll find it along the inside fram rail in the driver's side. Just follow the fuel lines.

Good luck oh and not sure if the 1988 F250 are the same as the 86, but if they are what i typed out should help. Happy Easter
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Apr 12, 2009 • 1988 Ford F 250
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Remove the heater core in 1988 F250 pick-up
here is a link that should be of some help.
http://www.autozone.com/addVehicleId,1071703/initialAction,repairGuide/shopping/repairGuide.htm?pageId=0900c152801cd90e
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Jan 08, 2009 • 1988 Ford F 250
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Heater core
You have to pull the dash and all the lower fascia, then remove the box that houses the Heater Core Take the clamps off the heater hoses from the engine compartment side of the firewall and disconnect the heater hoses. Disconnect the bracket that holds the heater core in place from the inside of the passenger compartment (if present.) Carefully remove the heater core and discard it. Install a new heater core reversing the above steps.
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