Hi, I have some newby questions for you guys that now these trucks.
I got a 1971 Ford F-100 that had a junked 360 and C-6 in it. I couldn't find a good FE that I could afford so dropped in a small block and AOD out of an '85 F150. Now it is getting cold and I wish the heater was working!
It was originally equipped with AC, but that has been eliminated. The fan motor seems OK, and no leaks from the core. But it is BARELY moving any air. The controls to open the heater valve and direct the vents don't work at all, the fan has been hotwired to a toggle switch and only has one speed.
So my question is: How do these units perform when they work well? Do they move enough air to heat the truck? Any general advise on replacing the controls (or fixing existing unit) would be greatly appreciated.

 

If the truck had factory installed integral A/C, integral means it was combined with the heater.

Once integral A/C is removed, the heater will not work properly...if at all.

If the truck had either Ford dealer installed A/C or an aftermarket unit, removing it will not affect the heater, since these were two separate units.

The heater water valve is spliced into the input to heater core heater hose and is cable operated. The valve tends to rust up inside, which means it usually gets stuck closed, or only partially open.

The cable that operates this valve connects to the backside of the heater control panel. On the valve is a lever the cable attaches to. Try wiggling it to see if it moves freely.

The valve is still available from Ford.

 

The valve will not move and I'm sure it needs replaced. The control lever inside the cab moves...I guess the cable must also be broken?
I believe this must have been dealer added air, if I read your other post correctly. The glove box is in the normal position.
I believe the unit has been changed at some point from all the poorly spliced wires.
Would this have an impact on the general airflow though? Like I say, if I put my hand by the vent, I am not always sure that I can even feel it moving!

 

Not being able to see your installation makes it hard to really say for sure what you do need. But, rest assurred of one thing, Ford Pick Up Heaters when working properly with a proper thermostat in the engine will literally drive you out of the cab in 0 degree weather.

One suggestion I would make would be to post a picture of your heater/ac/dashboard here for us to look at. Then, if it is aftermarket, go get a complete heater assy. from a local pick and pull and change it out and enjoy a warm winter.......... Good Luck!

 

If the valve is stuck (so what else is new?) very little or no hot water is getting into the heater core.

C3UZ18495A .. Heater Water Valve (Motorcraft YG133)) / Available from Ford.

MSRP: $38.46 // FTE sponsor Y2KFORDPARTS.COM price: $23.08.

Fits: 1961/66 F100/1100 // 1961/67 Econoline // 1966/77 Bronco // 1967/72 F100/750 // 1967/79 C Series Tilt Cab.
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Is the cable that attaches to the heater control panel still connected to the valve?

C8TZ18518A .. Heater Temperature Control Cable / 28.50" long / Obsolete

Fits: 1968/72 F100/750.

AL BILTON FORD in Holly Hill SC has ONE = 803-496-3150.

GREEN SALES CO. in Cincinnati OH has FOUR = 800-543-4959.

DON SANDERSON FORD in Glendale AZ has 17 = 623-842-8762.

MILLER OBSOLETE PARTS in Binghamton NY has 19 = 800-546-7278.

Sanderson will prolly be cheaper.
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Since the glove box is intact in the dashboard, your truck did not have factory installed A/C.

When factory A/C is installed, there is no dash mounted glove box.

There is a different glove box integrated into the A/C bezel that bolts to the bottom of the dash.

Removing a dealer installed A/C or an aftermarket A/C has no bearing on the trucks heater, since these A/C units were separate from the heater, not integrated into it.

 

Even with factory air, the original glove box will be there, only the insert will be very shallow. Maybe room enough there to put your registration card.

The factory air unit has an ADDITIONAL glove box located in the lower front of the unit, below the original glove box.

One sure way to tell. Does the heater control have a position for A/C? The heater controls themselves were different between factory-installed air and the non-a/c trucks with dealer-installed or aftermarket units.

As has already been suggested, post a photo and we can tell you more!!!

 

Thanks for the info! I'm about to attempt to attach some pics to help identify it.
I started it up and let it warm up today. The air that comes out of the unit is warm, so it is getting at least some water. My major concern at the moment is the volume of air is very low. I think if I could correct the problem at the controls, and I had all 3 fan speeds available, it might do better?

 

 

C8TZ19980B .. A/C Heater Control Panel / Use with FACTORY installed Intergral A/C / Fits 1968/72 F100/350.

With dealer installed or aftermarket A/C, the A/C controls are separate from the heater.

The heater plenum chamber (heater box) in the other pic was NOT used with factory A/C. It was only used for the heater.

With factory A/C, the A/C Heater plenum chamber is one combined unit.

There are two possible reasons why this A/C Heater panel is there.

1) What someone may have done is...replaced the original heater only control panel (C8TZ18549) with one from a factory A/C truck.

The control panels levers are connected to the body of the panel with plastic washers. Once those washers break, the levers flop around.

No parts are available, so the only fix is another control panel.

2) The only other possibility is, someone removed the factory A/C, then installed a heater from a non factory A/C truck, installed the glove liner and glove box door.

But...did not replace the A/C Heater control panel.

EDIT: This is a very strong possibility as I see the dash has been repainted. Notice the wires that are hanging down have RED paint on them.

That painted wire would not have occured on the assembly line, as the cabs were painted first. Then all the parts were installed in the cab later...further down the assembly line.

I bought a 1971 F100 Ranger XLT brand new with factory A/C.

It had that fracatta glove box combined with the A/C bezel, below the dash...and this same A/C Heater control panel.

 

Thanks ND. I am thinking that there may still be a case that it is the heater itself that has been replaced. IF that is correct (I'm not saying it is!), should this setup work with a new control panel? Or is this just a bad parts combination?
And, if I get a new control unit, would another factory A/C unit be OK, or would it work better to get a heat only one? I'd like to some day put A/C back in it. I have compressor, evaporator, condesor, etc.
Also, what catalogue are you looking at, and/or how do I go about getting one?
Thanks in advance, I appreciate all the knowledge!

 

You are right, the whole truck has been repainted and there is evidence of it. Painted wires, some of the chrome has paint on it as well. And I believe that the particular wire you mentioned goes to a speaker that was probably pretty hard core in the early 80's! Some one went through this truck and I'm afraid they did a lot more harm than good.

 

My guess is that the original factory air was removed and replaced with the factory heater-only setup.

You need to either find a factory a/c, or replace the control with the correct one from a non-a/c truck.

You can see that, as I mentioned in my earlier post, the glove box has the "registration card only" insert.

Get the right unit to go with the controls, or the right control to go with the right unit (easier to find), and you should be in good shape.

 

By the way, get the right wiring harness to go with the non-A/C cab, if you decide to go that route...

 

I do not know if the heater will operate properly with the wrong control panel...because I've never come across this situation before.

The heater water valve, and the temperature control cable that operates it...are the same with/without A/C.

The 1964/72 Ford Truck Parts Catalog is available on a CD from hipoparts.com for $22.00.

If you get it, go to Illustration Section 195, Page 5. All the Factory A/C dash components are shown.

It is imperative that A/C components that have been disconnected that had freon passing thru them, must have the ports taped over.

Once outside air gets into the compressor, dryer tank or expansion valve, the entire system must be evacuated within weeks, otherwise you can kiss these puppies good bye.

 

Thanks for all the info. I will go the route of whichever parts I find first!
Last question...what is the best interchange? 65-72?