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

heater core with ac and speedo questions

  • Thread starter Thread starter mike78
  • Start date Start date Feb 24, 2007
M

mike78

New Member
Apr 11, 2005
80
0
0
Feb 24, 2007
#1
  • Feb 24, 2007
  • #1
So as I am on my way to Bellingham to catch the ferry, my car turns into a steam mobile. Not a great amount, just enough to smell of antifreeze and almost make it impossible to see....
So now I am in Kodiak, AK and could use some defrost w/o steam, and have a heater core on the way....
Did a seach of this forum and figured out that an ac car is more involved than a non ac, but couldn't determine the best way to swap with all of the ac/non ac tips going back and forth. So, if you have swapped an ac heater core, how'd you do it? Any thing to look out for? I should mention that the ac works perfectly, and I hope to keep it.
Also, would a radaitior stop leak fix this? I don't really want to do this, as its a brand new radaitior....but.....
Next, my speedo went poof.... I guess all those interstate miles on a 30 year old plastic gear weren't good for it.
I pulled the cable from the c-4 and its gone....$h!t....just had this c-4 rebuilt!!! Where'd it go??????? I don't want my tranny dying because of a plastic gear...
Anyone who can, please advise on what gear{part #} I need for a bone stock replacement..please (78,302,13"tires,C-4)
Please advise if you can, and thanx...........mike78
 
T

THE COBRAMAN

pig 'rassler
Founding Member
Mar 11, 1999
1,974
0
36
Oklahoma
Feb 24, 2007
#2
  • Feb 24, 2007
  • #2
IMO, on the heater core, plan on pulling the dash out. It CAN be done with just loosening it, pulling it back, and working around it, BUT 1) It's a HUGE pain in the rump that way, and 2) 30 year old plastic dashes and stress from pulling...not a good mix. You'll need to recover the refrigerant, as it is a Federal offense to vent it to the atmosphere (and it's the right thing to do). Might be able to have a shop evac it for you, don't know your situation up there. Split the expansion valve from under the hood, MUCH easier than trying to disconnect the lines from it. Splitting it is the Ford service method, anyway.

Gear will depend on the axle ratio, but they're usually white in 77/78. You might try ther calculator on the org website http://www.mustangii.org/tech/speedo/ but I've found in my experience, it's usually about one tooth off.
 
M

mike78

New Member
Apr 11, 2005
80
0
0
Feb 25, 2007
#3
  • Feb 25, 2007
  • #3
All good info, thanks, But what about the missing speedo gear pieces? How concerned should I be?
 
T

THE COBRAMAN

pig 'rassler
Founding Member
Mar 11, 1999
1,974
0
36
Oklahoma
Feb 25, 2007
#4
  • Feb 25, 2007
  • #4
Did it have the clip on it when it went in? That's the piece I'd be worried about. I would think the plastic gear will just lay in the extension housing, but if the metal clip gets picked up, it could get ugly. Might try fishing around with a magnet stick to see if you can pick up the clip.

It's been a while since I messed with a C4, you might be able to pull the extension housing and see what's floating around in it while it's in the car.
 
You must log in or register to reply here.

Similar threads

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
509
1996 - 2004 SN95 Mustang -General/Talk- Sep 5, 2025
mnky99
M
M
2001 evap/heater core questions
  • mnky99
  • Sep 3, 2025
  • SN95 V6 Mustang Tech
Replies
3
Views
318
SN95 V6 Mustang Tech Sep 3, 2025
mnky99
M
M
2001 v6 heater hose quick connect question
  • mnky99
  • Sep 24, 2025
  • SN95 V6 Mustang Tech
Replies
8
Views
585
SN95 V6 Mustang Tech Sep 26, 2025
mnky99
M
D
Engine Can a heater core still leak if the ac is never in use?
  • dqureshi06
  • May 28, 2024
  • Fox 5.0 Mustang Tech
Replies
6
Views
2K
Fox 5.0 Mustang Tech May 30, 2024
AeroCoupe
Resolved Needing some guidance on the A/C vacuum lines again
  • mikeah
  • Feb 12, 2024
  • Fox 5.0 Mustang Tech
  • 2
Replies
22
Views
5K
Fox 5.0 Mustang Tech Aug 21, 2024
alutwon
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?