Question about 1999 Ford Expedition

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I need to change heater core i need diagram - 1999 Ford Expedition

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No you dont drain coolant disconnect the two heater hoses headed to the firewall . under the dash you have to disconnect the black casing cover . take your time on doing this . if you think you cant take to a local garage

Posted on Feb 06, 2010

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Posted on Jan 02, 2017

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SOURCE: heater core

go to the libruary n get a service manual

Posted on Jun 13, 2008

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SOURCE: heater core replacement

This is a really easy job, disconnect the heater hoses at the firewall, go inside the truck on the passenger side there is a plastic panel/cover over the core, 6 bolts/screws I think, remove the cover pull the core, tops 1 hour, as job at work I did them in 20 minutes.

Posted on Oct 15, 2008

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SOURCE: heater core

Posted on Dec 13, 2008

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SOURCE: need a diagram or instructions on how to replace a heater core 97

buy a haynes repair manual for your vehicle

Posted on Mar 12, 2009

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SOURCE: how to change heater core in 92 chevy pick up

unfortunately the fastest easiest way is usualy to remove the entire dash and its about a 2 day job

Posted on Feb 11, 2010

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Need a diagram for replacing heater core on 1969 f-250 defrost heater

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1992-96 Models

See Figures 1, 2 and 3

  1. Disconnect the negative battery cable.
  2. From under the dash, remove the heater protector from the front of the A/C and heater unit. It is attached by two clips.


Fig. Fig. 1: The heater protector is a panel attached to the front of the unit

  1. Unscrew and unclasp the heater core. Disconnect the heater pipes.

Fig. Fig. 2: There are three screws holding the pipe clamps

  1. Pull the core out of the vehicle.


Fig. Fig. 3: Slide the core out in this direction from the unit

To install:

  1. Place the core into the A/C and heater unit.
  2. Connect the heater pipes.
  3. Install the 3 clamps and screws to secure the unit.
  4. Install the heater protector.

9. Remove radiator cap, start car, refill system, allow car to reach normal temp with thermostat open and coolant flowing in radiator. open any bleed ports on engine to release trapped air. top off radiator and close cap.

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I have changed out a heater core on a Blazer like yours and while it isn't extremely difficult, it is quite a job, as you need to remove the dash to do so.

If you need some guidance, I would suggest that you spend about $20 and get a subscription to :

It helped me on all of the cars that I had, and has step by step instructions, as well as printable diagrams and pictures.

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Heater core

The automotive repair manuels that you can buy at the major part stores such as Autozone, Advance or ORiley's do a good job of describing how the heater core is removed. Most heater cores come out from under the dash, while a rare few are removed from the firewall.

One wonders why you are changing the heater core. Are you getting steam on the inside of your windshield? Usually the best indication your heater core is leaking, or are you getting no heat? In which case it make be duct doors.


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