• Mustang Forums
  • 1974 - 1978 Mustang II Talk & Tech

Heater core removal

  • Thread starter Thread starter vooderman
  • Start date Start date May 5, 2008

vooderman

New Member
May 5, 2008
16
1
0
Lockport, Illinois
May 5, 2008
#1
  • May 5, 2008
  • #1
Well, I am a new poster here. It looks like there are some die hard II enthusiasts here and the wealth of information can certainly help me with my project. I Installed a 351W in my 78KC and man I can tell you, it had to be shoehorned in there but it now fits. (and actually runs) I am going to install a set of stainless braided hoses to the heater core and before I begin, I thought it would be a good idea to see if anyone has some tips for me? I dont want to "dig in" and create more work than needed.

Fire away, any ideas would be greatly appreciated.

I will be posting my pictures as soon as I figure out how to?
 

LILCBRA

I wish I didn't have all of these balls in the air
Mod Dude
Dec 6, 2005
6,446
5,426
194
Corn County USA
May 5, 2008
#2
  • May 5, 2008
  • #2
Are you trying to replace the heater core, or just run new hoses? The heater core, in my opinion, would be easiest to replace after removing the dash. I went ahead and did mine while I had it apart, so that is how I see it. Maybe someone else tried it successfully without removing the dash?!? I'm not sure it would be an easy process that way though...
 

vooderman

New Member
May 5, 2008
16
1
0
Lockport, Illinois
May 5, 2008
#3
  • May 5, 2008
  • #3
I am going to replace just the hoses but it appears that the heater core needs to be removed to get at the hoses. Am I correct with this?
 

Dano78

Founding Member
Nov 1, 1999
2,633
2
47
Vancouver, WA
May 6, 2008
#4
  • May 6, 2008
  • #4
On an Non-A/C heaterbox the hose connections to the heater core are on the interior side of the firewall, but external of the heater box up on the top. If you remove the glovebox and liner you should be able to access those hose connections. Still won't have much room to work. Loosening the heaterbox from the firewall and dropping it down a bit, will make it a bit easier. Naturally, if you're this far, you might as well replace the heater core if it is at all questionable.

Now if you have A/C, doesn't the heater core stubs pertrude through the firewall? I can't remeber for sure. I've replaced an A/C equipped heater core in a II, and it's no picnic.
 

kcobra302

Founding Member
Mar 22, 2000
864
1
16
latham ny
May 6, 2008
#5
  • May 6, 2008
  • #5
hose ends on the ac cars are on the engine bay side of the firewall. if you are doing the heater core on an ac car set aside 6 to 8 hours. if i remember the book i had gives you 6.5 and you will be hustling and must know exactly what you are doing to beat that time. i really like working on my cars but i can tell you i hated doing the core. just a plain pain in the a%$

a few good things that came out of my replacement was i was able to eliminate all of the squeeks and rattles from the dash and clean all the bugs, debris and old sticker scrappings from between the dash and windshield. really not much.

non ac cars are very easy to do the core.
 

vooderman

New Member
May 5, 2008
16
1
0
Lockport, Illinois
May 6, 2008
#6
  • May 6, 2008
  • #6
Thanks for the replies. It is a non A/C car. I'll give it a try this weekend.
 
You must log in or register to reply here.

Similar threads

Engine Bleeding air in the heater core
  • keel
  • Apr 2, 2026
  • Fox 5.0 Mustang Tech
Replies
10
Views
272
Fox 5.0 Mustang Tech Apr 23, 2026
limp
M
2001 evap/heater core questions
  • mnky99
  • Sep 3, 2025
  • SN95 V6 Mustang Tech
Replies
3
Views
345
SN95 V6 Mustang Tech Sep 3, 2025
mnky99
M
M
Progress Thread mnky99 2001 V6 evap core, ac compressor, heater core replacement
  • mnky99
  • Sep 5, 2025
  • 1996 - 2004 SN95 Mustang -General/Talk-
Replies
1
Views
592
1996 - 2004 SN95 Mustang -General/Talk- Sep 5, 2025
mnky99
M
B
Saying Hi
  • BriansNSane
  • Dec 20, 2025
  • The Welcome Wagon
Replies
5
Views
328
The Welcome Wagon Dec 21, 2025
BriansNSane
B
M
  • Locked
2001 evap core tube support
  • mnky99
  • Sep 4, 2025
  • SN95 V6 Mustang Tech
Replies
4
Views
366
SN95 V6 Mustang Tech Sep 5, 2025
mnky99
M
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 1974 - 1978 Mustang II Talk & Tech
Menu
Log in

Register

  • Forums
  • What's new
  • Media
  • Resources
  • Contact
  • Sponsor
X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?

X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?