1994 - 1998 Fan Motor - Ford Mustang Forums : Corral.net Mustang Forum
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post #1 of 33 Old 06-06-2016, 11:16 PM Thread Starter
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1994 - 1998 Fan Motor

My stocker finally went out this spring, I jumped the gun and bought a oreilys fan motor. After my car slowly creeps in temperature I notice that the fan sounds the same speed on high vs low. Sure enough, the oreilys fan motor says "single speed" in the description.

Where can I buy one a TRUE factory replacement so I don't run into this again?

Thank you.


94 GT....forged 306, Trickflow Street Intake,
Stage 3 Ported GT-40P's, Lunati 51014 cam w/ 1.7's
S-Trim.. heat soaked.. 509rwhp & 505tq
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post #2 of 33 Old 06-07-2016, 10:09 PM Thread Starter
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I know several of you have replaced fan motors. Where did you get them?


94 GT....forged 306, Trickflow Street Intake,
Stage 3 Ported GT-40P's, Lunati 51014 cam w/ 1.7's
S-Trim.. heat soaked.. 509rwhp & 505tq
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post #3 of 33 Old 06-07-2016, 11:48 PM
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I can't begin to tell you the time I've spent trying to find a correct replacement from all the parts houses, they all have single speed now. Ended up at junk yard. Freaking pain in the ass!! When you check at the parts houses, if the fan crosses to the V6 it's the wrong fan.

On a quiet day you can hear Chevys rusting. (except my '02 Z06)

All better now.....Stroked 331, Forged Probe Pistons, Scat Crank & Rods, Kenne Bell 2200, AFR 185's, Comp Cam XE266HR, BBK 70MM TB, 90MM LMAF, 42# injectors, 3.55's, JBA Shorties, MagnaFlow exhaust, 395 RWHP, 403 RWTQ
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post #4 of 33 Old 06-07-2016, 11:56 PM
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Just searched for my original post. Looks like I found a 2 speed fan but had to go to j/y for a fan and shroud that matched the drive shaft on the fan. I'll see if I can find my paperwork tomorrow.

https://forums.corral.net/forums/94-9...ing-fan-2.html
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On a quiet day you can hear Chevys rusting. (except my '02 Z06)

All better now.....Stroked 331, Forged Probe Pistons, Scat Crank & Rods, Kenne Bell 2200, AFR 185's, Comp Cam XE266HR, BBK 70MM TB, 90MM LMAF, 42# injectors, 3.55's, JBA Shorties, MagnaFlow exhaust, 395 RWHP, 403 RWTQ
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post #5 of 33 Old 06-09-2016, 12:38 PM Thread Starter
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Thank you for the confirmation of the single speed fan that sure is ridiculous that they can't produce a two speed.

Has anyone tried to open up the factory motor and replace the bearings?

94 GT....forged 306, Trickflow Street Intake,
Stage 3 Ported GT-40P's, Lunati 51014 cam w/ 1.7's
S-Trim.. heat soaked.. 509rwhp & 505tq
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post #6 of 33 Old 06-09-2016, 11:08 PM
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add a resistor in parallel, to another pin,. and you have your second speed.

89 GT gr-40, KB2200(10psi), tweecer R/T,LC-1, 22gal cell, w/tailpipes.
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post #7 of 33 Old 06-10-2016, 10:46 PM Thread Starter
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Yea but wouldn't that cause the fan to run slower not faster indy?

94 GT....forged 306, Trickflow Street Intake,
Stage 3 Ported GT-40P's, Lunati 51014 cam w/ 1.7's
S-Trim.. heat soaked.. 509rwhp & 505tq
BADAZGT
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post #8 of 33 Old 06-11-2016, 09:15 AM
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yes

they give you high speed, you will only be missing low.

89 GT gr-40, KB2200(10psi), tweecer R/T,LC-1, 22gal cell, w/tailpipes.
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post #9 of 33 Old 06-11-2016, 03:49 PM Thread Starter
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The fan I purchased has a much lower rpm than my original fan and is why I am seeing temperature creep.

94 GT....forged 306, Trickflow Street Intake,
Stage 3 Ported GT-40P's, Lunati 51014 cam w/ 1.7's
S-Trim.. heat soaked.. 509rwhp & 505tq
BADAZGT
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post #10 of 33 Old 06-11-2016, 05:48 PM
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exact same blade?

what is the rpm difference?

is there an airflow difference?


89 GT gr-40, KB2200(10psi), tweecer R/T,LC-1, 22gal cell, w/tailpipes.
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post #11 of 33 Old 06-11-2016, 09:55 PM Thread Starter
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I didn't do a back to back comparison because the bearings locked up on my old one but I am positive there is an rpm difference and therefore an airflow difference. Yes same blade

94 GT....forged 306, Trickflow Street Intake,
Stage 3 Ported GT-40P's, Lunati 51014 cam w/ 1.7's
S-Trim.. heat soaked.. 509rwhp & 505tq
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post #12 of 33 Old 06-12-2016, 12:52 AM
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rpm difference does NOT mean airflow difference,,,,,,,,

blade shape plays a role

and without measuring it, you are guessing.

89 GT gr-40, KB2200(10psi), tweecer R/T,LC-1, 22gal cell, w/tailpipes.
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post #13 of 33 Old 06-12-2016, 12:44 PM Thread Starter
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Rpm difference means airflow difference when you are using the exact same blade and shroud setup. I took the old motor out and put the new motor in the same factory setup.

If that was not a common variable I would agree with where you are going with this.

94 GT....forged 306, Trickflow Street Intake,
Stage 3 Ported GT-40P's, Lunati 51014 cam w/ 1.7's
S-Trim.. heat soaked.. 509rwhp & 505tq
BADAZGT
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post #14 of 33 Old 06-12-2016, 07:34 PM
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get a better motor?

or use a markVIII

89 GT gr-40, KB2200(10psi), tweecer R/T,LC-1, 22gal cell, w/tailpipes.
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post #15 of 33 Old 06-12-2016, 10:15 PM
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The radiator electric motor was designed by Siemens, the stk Ford part number was F4ZH-8K621-AB. Check with Siemens and see if they have other electric motors that may work for you.

849rwhp and 771rwtq SAE with no Nitrous
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post #16 of 33 Old 06-12-2016, 10:56 PM Thread Starter
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^ Good info guys. I'll see what I can dig up and report back

94 GT....forged 306, Trickflow Street Intake,
Stage 3 Ported GT-40P's, Lunati 51014 cam w/ 1.7's
S-Trim.. heat soaked.. 509rwhp & 505tq
BADAZGT
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post #17 of 33 Old 06-15-2016, 05:09 PM
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I posted a while back about these replacement fans/motors. Both Four Seasons and Pioneer are single speed.
Your solution is a VDO fan motor from Oreillys.
VDO PM9007 - Radiator Fan Motor | O'Reilly Auto Parts

The ad says it's single speed but mine is dual speed. I tested it with the KOEO procedure.

CHP/CPR (Coast High Performance) / (Custom Performance Racing Engines)347 lasted a whopping 500 miles due to poor machining, metal debris in main bearings, damaged cam bearing and a balance job that was off 64ozs!
Buyer Beware.
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post #18 of 33 Old 06-17-2016, 01:56 AM
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Here's what I found out. The VDO is a single speed motor. But....
there are high and low speed connectors on the motor. The low speed connector has a resistor hooked to it and hidden inside of fan motor case. When the slow speed relay is energized in the CCRM; 12 volts are applied to the low speed prong on fan motor. That 12v goes through the internal resistor thus slowing the fan speed.
High speed gets a full 12v with no resistor and runs at a higher speed.

To test your motor for both speeds; first hook a ground wire to the ground terminal on fan motor. Ground it to the battery or an engine bay bolt. Now connect a wire to the + post of battery and touch the other end to either the low or high speed terminal on fan motor. Now touch the positive wire to the other speed terminal. Did you notice a speed difference? Do not touch the + wire from battery to the fan motor casing or the ground terminal on motor.

CHP/CPR (Coast High Performance) / (Custom Performance Racing Engines)347 lasted a whopping 500 miles due to poor machining, metal debris in main bearings, damaged cam bearing and a balance job that was off 64ozs!
Buyer Beware.
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post #19 of 33 Old 06-17-2016, 09:23 AM
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resistor in parallel???? think I mentioned that

89 GT gr-40, KB2200(10psi), tweecer R/T,LC-1, 22gal cell, w/tailpipes.
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post #20 of 33 Old 06-17-2016, 12:42 PM
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Quote:
Originally Posted by indy2000 View Post
resistor in parallel???? think I mentioned that
You most likely did mention it Indy.

I'm not sure that I would classify it as in parallel. One lead of a single resistor is connected to the low speed terminal and the other lead goes to the motor. Both speeds then use the same winding. This is an assumption based on my research.

CHP/CPR (Coast High Performance) / (Custom Performance Racing Engines)347 lasted a whopping 500 miles due to poor machining, metal debris in main bearings, damaged cam bearing and a balance job that was off 64ozs!
Buyer Beware.
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post #21 of 33 Old 06-17-2016, 06:27 PM
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Correction....

The low speed resistor is in the CCRM. If you test at the fan; both speeds will be the same.

I spoke with VDO today. The tech said that the V6 fan motor runs 150 rpm's more than the V8 motor. I have no idea why they would but a fan with more CFM on a V6.

Part number PM9038 is the V6 model.
PM9007 for V8.

CHP/CPR (Coast High Performance) / (Custom Performance Racing Engines)347 lasted a whopping 500 miles due to poor machining, metal debris in main bearings, damaged cam bearing and a balance job that was off 64ozs!
Buyer Beware.
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post #22 of 33 Old 06-17-2016, 08:19 PM
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Quote:
Originally Posted by fasterthangas View Post
You most likely did mention it Indy.

I'm not sure that I would classify it as in parallel. One lead of a single resistor is connected to the low speed terminal and the other lead goes to the motor. Both speeds then use the same winding. This is an assumption based on my research.
if you have a single speed fan, it only has on terminal

you make another connection in parallel

89 GT gr-40, KB2200(10psi), tweecer R/T,LC-1, 22gal cell, w/tailpipes.
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post #23 of 33 Old 06-17-2016, 09:37 PM
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Quote:
Originally Posted by indy2000 View Post
if you have a single speed fan, it only has on terminal

you make another connection in parallel
3 terminals. See the plug here:

VDO PM9038 - Radiator Fan Motor | O'Reilly Auto Parts

CCRM schematic:

http://www.veryuseful.com/mustang/te...AC-Diagram.gif

CHP/CPR (Coast High Performance) / (Custom Performance Racing Engines)347 lasted a whopping 500 miles due to poor machining, metal debris in main bearings, damaged cam bearing and a balance job that was off 64ozs!
Buyer Beware.
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post #24 of 33 Old 06-18-2016, 12:24 AM
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edit

so?

what am I suppose to see?

they made it easy for you to add a resistor

89 GT gr-40, KB2200(10psi), tweecer R/T,LC-1, 22gal cell, w/tailpipes.
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post #25 of 33 Old 06-18-2016, 12:37 AM
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Quote:
Originally Posted by indy2000 View Post
edit

so?

what am I suppose to see?

they made it easy for you to add a resistor
Do me a favor Indy. Save the sarcasm and vagueness.

OP...I hope this helps in some way. Good luck.
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CHP/CPR (Coast High Performance) / (Custom Performance Racing Engines)347 lasted a whopping 500 miles due to poor machining, metal debris in main bearings, damaged cam bearing and a balance job that was off 64ozs!
Buyer Beware.
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post #26 of 33 Old 06-18-2016, 04:55 AM
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Quote:
Originally Posted by fasterthangas View Post
I posted a while back about these replacement fans/motors. Both Four Seasons and Pioneer are single speed.
Your solution is a VDO fan motor from Oreillys.
VDO PM9007 - Radiator Fan Motor | O'Reilly Auto Parts

The ad says it's single speed but mine is dual speed. I tested it with the KOEO procedure.
So you bought a VDO with two speeds? Do you have or can you get your part number if so? I'm curious about this as well. I have a little noise in my fan and would rather replace it than wait.
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post #27 of 33 Old 06-18-2016, 09:54 AM
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Quote:
Originally Posted by fasterthangas View Post
The low speed resistor is in the CCRM. If you test at the fan; both speeds will be the same.

False,

do me a favor, look at the wiring diagram you posted, and point out this resistor in the ccrm.....

89 GT gr-40, KB2200(10psi), tweecer R/T,LC-1, 22gal cell, w/tailpipes.
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post #28 of 33 Old 06-18-2016, 12:25 PM
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Quote:
Originally Posted by j71m79 View Post
So you bought a VDO with two speeds? Do you have or can you get your part number if so? I'm curious about this as well. I have a little noise in my fan and would rather replace it than wait.
The part number is in your quote above. I've been using one for months now. Obviously I'm struggling to describe it electronically, but it will operate in both speeds.

CHP/CPR (Coast High Performance) / (Custom Performance Racing Engines)347 lasted a whopping 500 miles due to poor machining, metal debris in main bearings, damaged cam bearing and a balance job that was off 64ozs!
Buyer Beware.
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post #29 of 33 Old 06-18-2016, 11:52 PM
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Ok. I looked it up as well. Just wanted to clarify that it was indeed the number you have. Thanks man.
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post #30 of 33 Old 06-21-2016, 10:13 PM Thread Starter
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Thank you all for the help. Hopefully I can get some time soon and complete this install with a new two speed fan!!

94 GT....forged 306, Trickflow Street Intake,
Stage 3 Ported GT-40P's, Lunati 51014 cam w/ 1.7's
S-Trim.. heat soaked.. 509rwhp & 505tq
BADAZGT
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post #31 of 33 Old 06-21-2016, 11:48 PM
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that is single speed

89 GT gr-40, KB2200(10psi), tweecer R/T,LC-1, 22gal cell, w/tailpipes.
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post #32 of 33 Old 06-21-2016, 11:57 PM
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Connected to your factory wiring; this motor will provide two speeds to your fan.


VDO PM9007 - Radiator Fan Motor | O'Reilly Auto Parts

CHP/CPR (Coast High Performance) / (Custom Performance Racing Engines)347 lasted a whopping 500 miles due to poor machining, metal debris in main bearings, damaged cam bearing and a balance job that was off 64ozs!
Buyer Beware.
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post #33 of 33 Old 06-22-2016, 12:14 AM
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ah remember now,,,,,,!!!

this was like the only aftermarket one that had the correct internal wiring..

my apologies fasterthangas...........my memory not so good,,,,,,,,,,,,,

89 GT gr-40, KB2200(10psi), tweecer R/T,LC-1, 22gal cell, w/tailpipes.
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