answersLogoWhite

0


Best Answer

The heater core is difficult to change on the Ford trucks. They have it buried in the plenum box and you have to remove the steering wheel, steering column, dash, evacuate the refrigerant system, drain the radiator, and remove the plenum box to get to the core. Replacing the core is easy, getting to it is a day's work. The Expedition is particularly difficult to get to. It is almost above the transmission tunnel and well buried behind the dash. The Expedition uses the same plenum box as the F150, so any information on that system applies to the Expedition/Navigator.

You need to be sure that the heater core is really the problem before tackling this job. If you have a pool of coolant on the floor, you'll have to go after the core. If the problem is lack of heat, there are some things you need to eliminate before tearing into the truck. You need to make sure that coolant is flowing through the core. Check the temperature of the heater hoses going into the firewall when the engine is cool and see if they warm up together as the engine warms up. If both hoses get hot at about the same rate, this is a good indication that coolant is flowing through the core. You can also remove the hoses and flush the core with a water hose splice from Home Depot and a water hose. Water should flow unobstructed through the core.

If it appears that coolant is flowing and you don't have obvious leaks, the next step is to check the blend door. This door controls the air flow through the heater core and failure is common on Ford trucks. When the door breaks, it can block the flow of air through the core and kill heat and will also have an impact on AC. If the system seems to work intermittently, it's a good indication that the door is broken and rattling around randomly blocking or opening the passage to the core.

For diagnostic information on how to check the operation of the blend door and a cheap easy fix, check the heatertreater listing on Ebay or the web site at heatertreater.net. The dealer fix for the blend door is basically the same procedure for replacing the heater core, so it will be expensive. The HeaterTreater alternative will solve the problem at a fraction of the cost and work and is well within the capability of the average shade tree mechanic.

User Avatar

Wiki User

โˆ™ 2008-11-09 03:41:15
This answer is:
๐Ÿ™
0
๐Ÿคจ
0
๐Ÿ˜ฎ
0
User Avatar
Study guides
๐Ÿ““
See all Study Guides
โœ๏ธ
Create a Study Guide

Add your answer:

Earn +20 pts
Q: How do you remove and replace the heater core on a 98 Ford Expedition 2wd 5.4 V8?
Write your answer...
Submit
Related questions

How do you replace a heater core in a 1998 Ford Expedition?

How do you replace a heater core in a 1998 ford expedition?"


Instructions to remove heater core on 2001 Ford Expedition?

how to remove the lines from the heater core on a 2001 expedition


How much does it cost to replace a heater core on a 2001 ford expedition?

Cost about 1000 - 1200$. This is one of the hardest heater cores to replace.


How do you replace the heater fan on 2003 Ford Expedition?

its under the passenger side of the dashboard


How do you remove transmission on Ford Expedition?

need to replace transmission seals


Where is the heater control valve for a 1997 Ford Expedition located?

where is the heater control valve for a 1997 ford expedition


How do you replace brake lights on a 2001 ford expedition?

Remove the tail light housing and replace the bulbs.


How do you remove the heater core on a 1992 Ford Explorer?

specs on how to replace a heatercore on a 1993 ford explorer


How do you remove front grill from Ford Expedition?

how do you remove the grill from a 2008 ford expedition?


Why is the heater not working in the ford expedition Eddie Bauer?

If the heater is not working in your Eddie Bauer edition Ford Expedition, your heater core is probably junk and needs to be replaced.


How do you replace a radiator support on 2003 Ford Expedition?

How do you replace a radiator on 2003 ford expedition?


Replace heater core 1987 ford e150 van?

Remove the water supply hoses from your 1987 Ford E1 50 heater core. Remove the heater core retaining bolts. Reverse the process to install the new heater core.


Where can I find a Ford expedition heater parts diagram?

You can find a Ford expedition heater parts diagram at most auto-parts stores. You can obtain the heater parts diagram at most Ford dealerships.


How do you bypass the heater core on a 98 Ford Expedition?

Remove the two hoses that go through the firewall to the heater. Connect these two hoses together.


How do you remove and replace a heater core on a 1991 Ford Crown Victoria?

The dash has to be removed to gain access to the heater box. The heater box then comes out and is split open to replace the core.


How do you replace the ignition switch on a 2000 Ford Expedition?

How do you replace the ignition switch on a 2000 ford expedition?


How do you replace block heater on ford f 250 7.3 liter diesel?

remove old heater and screw in new


Can you remove the air suspension from a 2000 ford expedition and replace it with stock shocks?

go to strutmasters.com


How do you replace the front heater core in a 1998 ford expedition?

The dash has to be removed. Once the dash is out, the top of the heater case comes off to gain access to the core.


How do you replace the heater core on a 1993 ford XL f-150?

The 1993 Ford F1 50 pickup truck heater core can be replaced by removing the water supply hoses. Remove the heater core retaining bolts. Reverse the process to replace the new heater core.


How do you replace the fog light located on a 2003 Ford Expedition?

How do you replace the fog light located on a 2003 Ford Expedition?


Where is heater relay switch on 2001 Ford Expedition?

Where is heater control switch


Can i get the video how to replace the heater core on 1998 Ford Expedition?

i want the video or instruction,how replace the heater core on the ford expedition --------------------------------------------------------------------------------------------- Here is a link to a step by step tutorial with pictures: http://www.queegebo.com/cars-a-other-vehicles-articles-top-166/31-1997-ford-f-150-46.html


How do you replace the airbag module on a 2000 Ford Expedition?

Where is the airbag module on the 2000. Ford expedition


How do you remove a heater coil from a 1988 ford crown Victoria?

The dash has to be removed to gain access to the heater box. The heater box then comes out and is split open to replace the core.