Heater core back flush? - Ford Truck Enthusiasts Forums

Go Back   Ford Truck Enthusiasts Forums > Newer Light Duty Trucks > Expedition & Navigator
Log In 

Expedition & Navigator 1997 - 2002 and 2003 - 2006 Ford Expedition and Lincoln Navigator SPONSORED BY:

Heater core back flush?

LinkBack Thread Tools Search this Thread
Old 10-17-2012, 04:11 PM
2000-EB-EXPY-AWD 2000-EB-EXPY-AWD is offline
Freshman User
Join Date: Sep 2010
Posts: 32
2000-EB-EXPY-AWD is starting off with a positive reputation.
Heater core back flush?

I've been searching the forum and can't seem to find a good detailed write up on how to back flush both front and rear heater cores in a 2000 5.4l.

Heat is not quite hot in the front and luke warm in the back. Both core lines in front are pretty dang hot. My son and i removed the rear panel and removed/checked actuator it moves fine. manually moved the blend door and it moves freely with no binding when put in the heat position not much heat. The inlet hose getts good and hot but the outlet doesnt. =plugged core

Just replaced the intake manifold not to long ago and did a pretty good drain and fill of the system then. Heat didn't work to great then either. coolant was clean and is now also.

Is there a good way to back flush both the front and the back at the same time or should it be done seperatley? I want to back flush to prevent pushing clog further into cores. Any advice or link to a good write up would be greatly appreciated. Thanks
Reply With Quote
Old 10-17-2012, 08:24 PM
lv2race's Avatar
lv2race lv2race is offline
Elder User
Join Date: Oct 2005
Location: OC Ghetto
Posts: 938
lv2race is gaining momentum as a positive member of FTE.lv2race is gaining momentum as a positive member of FTE.
I got about 10 feet of heater hose (I don't recall the ID off hand, maybe 5/8), cut it in half to 5' pieces, removed the cover on the rear, attached the hoses to each tube on the core and used the garden hose flushing each direction with the ends in a bucket. Make sure you drain the coolant first so you don't contaminate the ground with over spill.

Each time I switched hoses, the pressure got better. A lot of crap came out at first and it took some pressure to push it out. I flushed it until there was no pressure and the water flowed clear.


'00 Expo 5.4
'06 F-150 STX 4.6
Reply With Quote
Old 10-18-2012, 07:26 AM
2000-EB-EXPY-AWD 2000-EB-EXPY-AWD is offline
Freshman User
Join Date: Sep 2010
Posts: 32
2000-EB-EXPY-AWD is starting off with a positive reputation.
Thanks buddy. That was going to be my plan of attack unless some one has come up with a way to fulsh both front and back at the same time. I figure if i tie in under the hood, before the T conectors, and try to flush both at the same time, with the rear being clogged the flow would just be diverted through the front core only and the back core would stay clogged.
Does anyone know if I could just cut out the factory T fittings under the hood and repalce them with a regular T and hose clamps? I have read rumors of some sort of reducer that diverts some of the flow from the front core to the rear. If this is true and it is located in the T fitting, then I dont want to remove them. If not then a regular T and clamps would make future flushes so much easier! Just a thought
I guess ill give the rear core a flush here in a few. I plan on taking pics and posting them in a seperate DIY thread, if I can figure out how, for the next guy who comes along and tries to search first like I did.
As always, any tips or advice would be greatly appriciated!!
Reply With Quote

Similar Threads
Thread Thread Starter Forum Replies Last Post
heater issues 2000 expedition jcstu Expedition & Navigator 18 02-09-2015 11:25 PM
Poor cabin heat issue; not blend door mlelah Explorer, Sport Trac, Mountaineer & Aviator 26 01-10-2015 02:27 PM
02 supercrew heater problem krazykrenz Cooling, Heating, Ventilation & A/C 5 12-30-2014 05:48 AM
98 Expedition Heat Issue HMAN1055 Expedition & Navigator 13 12-15-2014 11:44 AM
Very little heat in 01 Expedition Buggie Expedition & Navigator 14 10-31-2013 11:28 PM

Go Back   Ford Truck Enthusiasts Forums > Newer Light Duty Trucks > Expedition & Navigator

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

Forum Jump

All times are GMT -5. The time now is 10:03 PM.


Powered by vBulletin® Version 3.8.7 AC2
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Advertising - Terms of Use - Privacy Statement - Terms of Service - Jobs
This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. FordŽ is a registered trademark of the Ford Motor Company.

vbulletin Admin Backup