CORRECT HEATER HOSE SET UP

[ELTBIRD]

Good morning!
Well, I just finished fixing the under dash electrical and vacuum lines. Also put a new heater core in. The old core was not connected which leads to my info request. I need to connect the heater hoses correctly but I cannot find a diagram anywhere showing the routing for a 1966 with AC. I have a hose clamp next to the choke, a double outlet on the manifold, a Y connector and a heater water valve. Can someone reply with a diagram showing the correct routing and what goes where? Or, if you have an AC car, pics showing the set up would be great. Thanks! Ed

[Rt.146]

Water goes in from the bottom, out from the top, I think.

[Inspector]

Here is a couple of photos of a 65 with AC. Hope they help

[ELTBIRD]

Thanks for the replies buy still not clear to me. A paper sketch would be great showing the set up from 2 outlets on manifold and water pump to heater core incorporating the carb clamp, Y connector and water valve. Thanks, Ed

[Scott6T6]

The diagram for the heater hose routing is actually found in the 1966 Thunderbird Electrical Assembly Manual on page 60. Yes, I know, strange place to find that! If you don't have the electrical manual I recommend you get one. I'm currently working on the OFS revision and was just looking at this diagram earlier this afternoon! I'm including the diagram for you here.
Scott

[stubbie]

[attachment=0]water pump.jpg

[Alan H. Tast]

BEAR IN MIND each year is slightly different in how the heater lines are run, and what is used with them. Scott6T6 posted the closest thing you're going to find in Ford-produced literature for routing on your '66. Don't doubt him, and please heed his advice to get the Electrical Assembly Manual reprint for your specific model year, along with the Body/Trim Assembly Manual. Both will go a long way in helping you understand how things were put together.

[ELTBIRD]

Hi,
Thank you all so much for your replies! This info is invaluable to me. I have been using these manuals and others for this ongoing restoration. Very interesting to see how the engineering is similar and/or different from other cars I have restored in the past. I did see the non AC heater hose set up but I missed the AC set up on page 60. Thanks Scott!

[Rt.146]

What happens when the heater hoses are reversed?

[Terry64HT]

Air will be trapped in the core. Very little or no heat.
Terry
64HT

[Gillerd]

The diagram for the heater hose routing is actually found in the 1966 Thunderbird Electrical Assembly Manual on page 60. Yes, I know, strange place to find that! If you don't have the electrical manual I recommend you get one. I'm currently working on the OFS revision and was just looking at this diagram earlier this afternoon! I'm including the diagram for you here.
Scott

Thanks for the diagram. This is what my friend neighbor is looking for. Gonna print and show this tomorrow when I help him install the headache rack and tonneau covers onto his truck.

[ELTBIRD]

Good evening,
My current project...Dual heater hose fitting on top of the intake manifold is rusty and leaking so I got a replacement. Existing one is 1" square. Replacement is 7/8" hex. Which is original? Also, can't get the old one loose. Soaked with liquid wrench, hit wrench with a hammer, no good. Thinking of using a breaker bar but I might snap it off. Any suggestions? On to the heater hose routing...Looking at page 60 in the electrical manual. It's not very clear by the Y connector but this is what I think is right...please let me know...
Starting at the dual manifold fitting where the coolant runs out...one hose connects to the smaller opening, goes thru carb choke clamp and connects to the Y connector. Next hose comes from the larger opening in the manifold fitting and goes to the upper heater valve connection. Then a hose leaves the bottom of the valve and goes to the lower heater core connection. Upper heater core connection hose goes to the Y. Final hose goes from the Y to the water pump connection which the coolant runs into. Sound good? Thanks....Ed

[georgemii]

The intake manifold is cast; the “Y” fitting is not.
I predict that several cycles of heating and cooling would make a big difference
(as you try to remove the fitting).

[redstangbob]

Existing one is 1" square. Replacement is 7/8" hex. Which is original?

This is what you should have. Good luck. Bob C

Starting at the dual manifold fitting where the coolant runs out...one hose connects to the smaller opening, goes thru carb choke clamp and connects to the Y connector. Next hose comes from the larger opening in the manifold fitting and goes to the upper heater valve connection. Then a hose leaves the bottom of the valve and goes to the lower heater core connection. Upper heater core connection hose goes to the Y. Final hose goes from the Y to the water pump connection which the coolant runs into. Sound good? Thanks....Ed

Yes, sounds right.
EDIT! nope, not through the choke clamp, but through the carb spacer plate. sorry

[ELTBIRD]

I am hesitant to torch the Y. It's far enough from the carb but it has flammable liquid wrench all over it.