I have a 2003 F-150 with the 4.2. 302,000 miles. The heater hoses broke loose form the heater core and the "quick" connect fitting to remove presented a problem. I eventually squeezed them with small vice grips and then chipped at them with a screwdriver to crack them off. I did very well on the left side but I distorted the right side very slightly. I believe I got it back to round at about 95%. I bought after market hoses with the quick connect fittings on them. I am thinking about applying Indian Head Gasket Sealer on the tubes from the heater core before I press on the hoses.....YOUR THOUGHTS PLEASE.

 

Seems unecessary. And potentially problematic in the future, if the hoses need to come off.

What are these "quick-connect" fittings? I only see typical rubber hose and hose nipples. I've not examined mine so don't know what they are. Do you have a link to where you bought them?

I'd just follow Ford's or the manufacturer's instructions. Why complicate things? Besides the fact that that Indian Head stuff is ancient science.

https://www.oreillyauto.com/detail/c...rd-f-150?pos=0

https://www.autozone.com/cooling-heating-and-climate-control/hose-heater/p/dorman-oe-solutions-hvac-heater-hose-assembly-626-608/482192_0_0?searchText=heater+hose

https://www.permatex.com/wp-content/uploads/tds/20539.pdf

 

I think that I found an example. I assume that you meant to put the sealer on the hose nipple that is part of the quick-connect. Not the o-ring seal inside the quick-connect. Still seems unecessary all around. Good luck.

https://www.partsgeek.com/c8cygyj-fo...-hose-set.html

 

This part is molded into the original Ford hoses and is made of heavy duty material. It is a quick connect press on fitting that is up against the firewall. Removal is next to impossible. In my case the plastic broke leaving half on the heater core tubing and half with the hose. As I attempted to remove the fitting the tube from the heater core became distorted...see my first post. I went to Ford but the original is NLA....I am asking if anyone has experienced the aftermarket fittings being very sensitive to the O ring and the tube...I was thinking of applying a sealant first.... or I may just abandon the fittings and use old style hose clamps and sealant...but the location is extremely tight...a marine style press and lock clamp may work...

 

I see. You're worried that the pipe end won't be a good sealing surface for the o-ring in the quick-connect fitting after the abuse it took. I wouldn't use the Indian Head on the o-ring seal. I'd use a non-hardening pipe sealer. One of the PTFE types would probably do the job.

You can find them at most hardware stores. The T plus 2 looks like a good one.

https://rectorseal.com/rectorseal-t-plus-2-group/

https://rectorseal.com/threadsealants-lp

 

Been there done that
You are going to need to replace the heater core or just painstakingly use a hose clamp and rid yourself of the quick connect