blower connections

[Techguy]

blower motor went out on my 85 with ac.
bought one from amazon

blower

it came with different connectors, so i chopped off my old ones and spliced them on the cables that came with this.  i tried all combinations but could not get the fan to work. im returning the fan, but all the other sites where im looking for this part dont show the right connectors. what am i missing?>

[grumpin]

Is it factory A/C or dealer installed A/C?

Could have came with a non A/C blower. And this is a guess on my part!

[Techguy]

thats the odd part, its got a weird ac setup. gary had told me its a dealer installed ac. but he cab looks like factory ac. ill get pics tonight for ya

[ArdWrknTrk]

Did you consider that the thermal fuse in the resistor block might be bad?
It looks like a tiny little can. (Kind of what we think of a resistor)
The blower has power all the time in run, and the speed control just switches different resistor coils to ground (or no resistor for high)

This is the little red or yellow fiberglass panel screwed into the plastic plenum inboard of the blower motor.
It can cause a fire if leaves or mouse nest get into those hot springs.



I'm going to suggest that you ohm out the resistor block.

[Techguy]

ArdWrknTrk wrote

Did you consider that the thermal fuse in the resistor block might be bad?
It looks like a tiny little can. (Kind of what we think of a resistor)
The blower has power all the time in run, and the speed control just switches different resistor coils to ground (or no resistor for high)

This is the little red or yellow fiberglass panel screwed into the plastic plenum inboard of the blower motor.
It can cause a fire if leaves or mouse nest get into those hot springs.



I'm going to suggest that you ohm out the resistor block.

 ill check that out thanks

[Techguy]

this is the connections that mine have

[ArdWrknTrk]

I'm not sure how that works with your truck.

The blower motor has power in run. The ground side of the motor goes to the resistor block, and from there power out of the three coils goes to the climate speed control in the dash, which selects which resistor to ground.

It's good practice to remove/inspect the resistor block on occasion to make sure there's no tinder caught up in it.

If you have a MM there's not much challenge to see how the fuse feeds all the coils.
Check for continuity across the fuse, and if you like you can check the resistance of each coil (but they will all seem low because you're not loading them enough to glow)

[Techguy]

alright i check it out, and update here. ty again for the help

[Techguy]

so i assumed the resistor was fine before because the fan would come on but the bearings were bad. that prompted to me to replace the fan, ill test the other and report back

[ArdWrknTrk]

Ahhhh, I didn't understand from your post that the bearings were bad.  Just that "the blower motor went out".

Then that you cut the connector off and couldn't get the new motor to work either....

This clicked in my head that it was not the blower, but something else (and that "else" can often be the resistor fuse, because people don't even know it's there!)

[Techguy]

ArdWrknTrk wrote

Ahhhh, I didn't understand from your post that the bearings were bad.  Just that "the blower motor went out".

Then that you cut the connector off and couldn't get the new motor to work either....

This clicked in my head that it was not the blower, but something else (and that "else" can often be the resistor fuse, because people don't even know it's there!)

ah no worries, still good things to check and i will. i apologize, my brain is running constantly (two full time jobs) so sometimes i dont convey things correctly

[ArdWrknTrk]

Did the dragging motor possibly blow the 30A fuse in the fuse box?

You should have power in 'key on' or 'accy' at the brown/orange wire.
The other wire should go to the resistor.

[Techguy]

ArdWrknTrk wrote

Did the dragging motor possibly blow the 30A fuse in the fuse box?

You should have power in 'key on' or 'accy' at the brown/orange wire.
The other wire should go to the resistor.

hmm thats a good point,sadly i didnt think of that. i made the grave mistake of assuming it would of still been ok. ill check that today. ty. my fuse box looks like a medical experiment gone wrong lol.

[Techguy]

blower

so this one i found by mistake and its got the correct blower motor wire connections. but i cant find what application this would fit

[ArdWrknTrk]

Given the D8UZ part number I would say it was originally designed for a 1978 Bronco.  💡
Looks like E-series vans up into the '90's.....

Of course it may fit many models made after that.

You have both the Ford # and the Motorcraft MM-381 numbers to go by.
I'm sorry. My parts manual is on CD and I don't have a functional optical drive to look at it.

[Techguy]

ArdWrknTrk wrote

Given the D8UZ part number I would say it was originally designed for a 1978 Bronco.  💡

Of course it may fit many models made after that.

You have both the Ford # and the Motorcraft MM-381 numbers to go by.
I'm sorry. My parts manual is on CD and I don't have a functional optical drive to look at it.

no worries, ty

[81-F150-Explorer]

D8UZ-19805-A  Blower Motor assembly. Factory A/C equipped. Motorcraft # MM-381

Fits 1978-1989 E-100/E-350 with Factory A/C.

So it will not fit your F-series.

------------------------------------

What you need if you have Factory A/C or Hi/Lo Vent.

E0TZ-19805-A Motorcraft # MM-390  
Fits: 1980-1981: F-U100/350

This has the correct connectors, so your truck seems to be a hodge podge. Several E-Bay hits including this one...

1980-1981 Blower Motor With Factory A/C



------------------------------------


E0TZ-19805-A (Replaced byE2TZ-19805-A (replaced by E2TZ-19805-B (replaced by: F1VY-19805-B))) Blower Motor Assembly. Factory A/C or Hi/lo Vent. Motorcraft # MM-390 (Replaced byMM-412 (replaced by MM-453 (replaced by: MM-517)))

Fits: 1980-1986 F-U100/350  You will have to modify the plug to fit what you have on most of these.

---------------------------------------

Some more hits on E-bay.

E0TZ-19805-A Motorcraft #390

E2TZ-19805-A Motorcraft #412

E2TZ-19805-B Motorcraft # 453

F1VY-19805-B Motorcraft # 517


-------------------------------------------

Pictures of the different blowers with connector differences: All are swappable if you modify the connectors.

1980-1981: E0TZ-19805-A / Motorcraft: MM-390



1982-1986: E2TZ-19805-A / Motorcraft: MM-412



1982-1986: E2TZ-19805-B / Motorcraft: MM-453



1980-1991+: F1VY-19805-B / Motorcraft: MM-517




---------------------------------------------------

Hope this helps.

[ArdWrknTrk]

Right....
So the blower Techguy already has in his truck has been hacked in there by some P.O.

Not surprising actually

[81-F150-Explorer]

ArdWrknTrk wrote

Right....
So the blower Techguy already has in his truck has been hacked in there by some P.O.

Not surprising actually

That's what it looks like. Yes.

I also edited my original post to supply more information to it.

Hope it helps ...   (although researching all that gave me a proverbial headache.  )

[Techguy]

81-F150-Explorer wrote

D8UZ-19805-A  Blower Motor assembly. Factory A/C equipped. Motorcraft # MM-381

Fits 1978-1989 E-100/E-350 with Factory A/C.

So it will not fit your F-series.

------------------------------------

What you need if you have Factory A/C or Hi/Lo Vent.

E0TZ-19805-A Motorcraft # MM-390  
Fits: 1980-1981: F-U100/350

This has the correct connectors, so your truck seems to be a hodge podge. Several E-Bay hits including this one...

1980-1981 Blower Motor With Factory A/C



------------------------------------


E0TZ-19805-A (Replaced byE2TZ-19805-A (replaced by E2TZ-19805-B (replaced by: F1VY-19805-B))) Blower Motor Assembly. Factory A/C or Hi/lo Vent. Motorcraft # MM-390 (Replaced byMM-412 (replaced by MM-453 (replaced by: MM-517)))

Fits: 1980-1986 F-U100/350  You will have to modify the plug to fit what you have on most of these.

---------------------------------------

Some more hits on E-bay.

E0TZ-19805-A Motorcraft #390

E2TZ-19805-A Motorcraft #412

E2TZ-19805-B Motorcraft # 453

F1VY-19805-B Motorcraft # 517


-------------------------------------------

Pictures of the different blowers with connector differences: All are swappable if you modify the connectors.

1980-1981: E0TZ-19805-A / Motorcraft: MM-390



1982-1986: E2TZ-19805-A / Motorcraft: MM-412



1982-1986: E2TZ-19805-B / Motorcraft: MM-453



1980-1991+: F1VY-19805-B / Motorcraft: MM-517




---------------------------------------------------

Hope this helps.

thanks., thats alot of good info. :) very helpful.