Heater Core Installation for 65/66 Mustangs - Page 2 - Ford Muscle Forums : Ford Muscle Cars Tech Forum

riley07 · 06-10-2010, 05:00 PM

from that pic, it looks like the upper hose on the heater box goes to the bottom on the water pump, and the bottom hose goes to the intake. Is this correct. or does it matter?

dennis111 · 06-10-2010, 05:50 PM

Quote:

Originally Posted by riley07

from that pic, it looks like the upper hose on the heater box goes to the bottom on the water pump, and the bottom hose goes to the intake. Is this correct. or does it matter?

Correct.

Top of heater core goes to the water pump.
Bottom of heater core comes from the intake.

The heater will work either way, although this the recommended way.

dennis111 · 06-10-2010, 05:54 PM

Quote:

Originally Posted by MUZ1 V8

These instructions with the pictures are great. I used them and removed/repaired & replaced my heater core with no issues.
I did however undo the two bolts that attach my A/C unit so I could move it foward slightly and ease the removal of the heater box.
Thank you,
Alistair Wilson.
New Zealand

Thank You for your comments. Glad that you added the input on the A/C unit.

I suppose that the full console that is sometimes found on non-AC cars would also need to be removed.

FEandGoingBroke · 06-10-2010, 06:08 PM

OK, it's like this.

When removing the box clips, NEVER put the screwdriver under the tip. you out it IN the lip and pry towards the opposite side so as not to break off the box's lip.

And use green tape to label the wires

JUDYANDBOB · 07-18-2010, 06:22 AM

Dennis, We own a fully refurbished 64 1/2 Mustang that we bought about 10 years ago. Yesterday we noticed that we were leaking anifreeze on the passenger side. Is the only reason for this a bad heater core-we never use the heat as it is a convertible and we only take it out in nice weather . My husband replaced the one on our 73 Grand Torino Sport and he had to drop the dash. Your instructions look like this is a much easier job to do.
Thanks,
JudyandBob

dennis111 · 07-18-2010, 01:27 PM

Quote:

Originally Posted by JUDYANDBOB

Dennis, We own a fully refurbished 64 1/2 Mustang that we bought about 10 years ago. Yesterday we noticed that we were leaking anifreeze on the passenger side. Is the only reason for this a bad heater core-we never use the heat as it is a convertible and we only take it out in nice weather . My husband replaced the one on our 73 Grand Torino Sport and he had to drop the dash. Your instructions look like this is a much easier job to do.
Thanks,
JudyandBob

Could be either the hose or the heater core. Much easier to drop the heater core in the 641/2-66's than the 73' Torino. The heater cores are very inexpensive. I also suggest buying 8'-9' of 5/8" heater hose and replace them too since it is very easy once the heater box has been removed. Optionally, you could also order a seal kit to complete the job but it is not required if all you want is the leak to stop.

Further details were given via PM.

JUDYANDBOB · 07-19-2010, 05:32 AM

Dennis,

Thanks for getting back to us so quickly. Your instructions look like they are going to be easy to follow. One other questions - do I need to take out the glove box to do this?

JudyandBob

dennis111 · 07-20-2010, 02:30 AM

I have never removed the glove box and can assure you that everything can be done from underneath the dash. Removing the glove box insert "might" give a clearer view to the bolt that is located under the cowl but I don't think that it is worth it since this pic shows exactly where it is at.

onlymustang · 08-10-2010, 07:09 PM

Hi Dennis

That's a great step by step procedure and awesome pics for the heater core removal and case rebuild. The writers at Mustang monthly could take a few lessons from you.

Great job!

Bruce
Ford Mustang - Information Specs Pictures Restoration

dennis111 · 08-11-2010, 02:28 AM

Quote:

Originally Posted by onlymustang

Hi Dennis

That's a great step by step procedure and awesome pics for the heater core removal and case rebuild. The writers at Mustang monthly could take a few lessons from you.

Great job!

Bruce
Ford Mustang - Information Specs Pictures Restoration

Thank You Bruce. :-) I enjoyed visiting your website so a Great Job! right back at you.

modo · 10-18-2010, 07:41 AM

Thanks for the nice write up. A lot easier then doing it in my fox thats for sure.

duck1098 · 02-20-2013, 10:33 PM

Thanks for the excellent writeup and pictures. Helped me a ton when I rebuilt my heater box. One last question regarding the big foam doughnut, how does that mount on the car? Is it just glued up on the underside of the cowl? Does it fit into the hole?

dennis111 · 02-21-2013, 02:20 AM

Quote:

Originally Posted by duck1098

Thanks for the excellent writeup and pictures. Helped me a ton when I rebuilt my heater box. One last question regarding the big foam doughnut, how does that mount on the car? Is it just glued up on the underside of the cowl? Does it fit into the hole?

Thank you guys.

The "doughnut" mounts around the outside of the raised flange of the heater box. Check out the tell-tale markings:

Ring Installed on box:

The ring will mate with the flat bottom of the cowl-it does not need to go into the hole. Also it does not need glued in either location as it will sit pretty on the heater box and then compress and remain there when it is bolted in place.

Good Luck!