Anyone know for sure if all resistor paks with that part number are the same?
I've been trying to ascertain what the difference is in what the different part IDs mean other than year. EOTH is an '80 model/E1TH is an '81 model. That 19A706 comes with many identifiers, but except maybe for installation method, could that resistor pak have the same values? My F100 has factory AC. I'm wanting to have one/some of these paks on hand....just in case. Thanks

 

That's only a partial number. You need the whole part number. Just because 19A706 is listed for all resistors, does not mean they are all the same, or have the same rating. You need to cross reference the WHOLE number.

Here is a loose example on what Ford part numbers mean, (Following part numbers are for example only):

EOTZ-8146-AA

First section:

E = Decade = 80's
O = Year of decade = 1980
T = Designed for Truck
Z = Parts Department

Second Section:

8146 = Part Identifier = Radiator Shroud

Third Section:

AA = Design Change Code



Just because most all radiator shrouds are numbered with 8146, doesn't mean they are all interchageable with each other. A Truck radiator shroud will not fit on a car for example. But both part numbers will have the part identifier as 8146.

Also, EOTZ does not mean it only fits that year model truck. It means year the part was first designed or changed. There are EOTZ parts on 90's vehicles as example. Also just because it is a EOTZ part does not mean it will fit a 1980 pickup. It might fit a van. That is where the design change code comes in. "AA" in the example above. "AA" may fit a pickup, whereas "E" might fit a van etc....

The same goes with the resistor. You need all of the number. Then you can cross reference that, and see if the numbers have been updated, or if an application can be cross matched.

 

I put the part number in just not all in a row. E1TH 19A706 AA. So the H means?

 

What I'm attempting to find out if there are similar resistors that will work. I'm not ordering any, but if I happen to run across a 19A706 but with a different identifier I'd know it would/wouldn't work.....like at a junk yard/abandoned truck/a NOS part/etc.
I"ve not found any resistance values for checking these paks. Anyone know the test procedure?
Thanks, I appreciate the help.

 

The "H" is the Engineering department responcible for designing the part originally.

Why the above number is called an Engineering number.

If it was the actual part number, that "H" would be a "Z".

"Z" = Part Department.

 

More than likely It won't work. The whole number has to match, not just 19A706. There are very few exceptions, and all require cross matching part numbers. Not just the part number you have now, but the part number you intend to replace it with. It would be simpler if Ford actually put the part number on the part. All they ever really did was put engineering numbers on them. The engineering number can vary, due to slight design improvements, but the part number "may" stay the same, unless there is a drastic change in material, or design that can affect compatability. Ford liked updating part numbers for no good reason as well.

You can take a ohmmeter and test it, with it unplugged. You should get a reading from all the connections at varying resistance levels. If you do not get a ohm reading of any kind, then it's defective. The blower not operating at a certain speed is another clue it might be defective.

BTW: 1980-1986 F-series use the same resistor, for A/C.

 

ok, thanks. All I've had for a long time was Low due to the bad wiring. I installed a direct Ground through a toggle switch for High. I've got the time now to fix the bad wiring with a new harness I've made.
Hmmm....'80-'86 good to know, thanks for that piece of info!

 

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I know you have a different year, but here is a diagram with resistor values for a 93 Ranger, and all the 93-94 trucks and vans have the same values.
I really don't think it matter much what resistors you put in there, as long as the switch has a setting for it, and even then you could bypass a setting, say... med-low, or med-high.
Basically, the lower the resistance, the higher the fan speed, and vice verse.

 

Thanks for the help!

 

This part is what I just bought to fix my heater fan speed on my 2009 f-350. I lost the #1 and #2 fan speed. The 3 and 4 speeds worked. The new resistor work fine all four speeds are operating fine. Fellow IBEW!