Okay, I have a big fan. Now what? - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 12 (permalink) Old 06-11-2010, 11:45 PM Thread Starter
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Okay, I have a big fan. Now what?

I plucked this from a local salvage yard today for $35. I am not sure what year car it came out of because it was so badly stripped. I do know it was a Texas State Trooper car though. How it made its way into a Ga salvage yard I will never know. But anyhoo, I saw the exact same sect up on two 1998 Lincoln Mark 8’s earlier in the day. So I am assuming it is from that time frame. I grabbed the wiring and cut it at the harness. I also got the temperature sensor. Unfortunately that part of the harness was missing. So I could not get that connector. I also grabbed all the relays because I do not know which one controls the fan. I took the lid from the fuse/relay box because I was hoping it could tell me which relay did what. The only problem is I need an owner’s manual to decipher it.

Now for the fun part. I want this to fit and work in my wife’s 1996 F250 with a 351 gasser. The kicker is I have to have it installed in one shot. So I need to know what else I require for the install. I know I have to make some brackets but that “should” be simple. What else is necessary?





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post #2 of 12 (permalink) Old 06-12-2010, 12:24 PM
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Have you considered an aftermarket controller? I used one from Advance Auto on my old Jetta Diesel. Just a thought, Chris

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post #3 of 12 (permalink) Old 06-12-2010, 01:16 PM Thread Starter
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I did not know one from the aftermarket would work with a stock fan. Thanks.
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post #4 of 12 (permalink) Old 06-12-2010, 01:18 PM Thread Starter
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I think I jumped the gun. I am thinking this is the fan I should have gotten.
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post #5 of 12 (permalink) Old 06-13-2010, 07:15 AM
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That box with the wires going to it is basically a control module for the fan speed, it also acts as the relay. Im not sure any of these setups used a relay for a power circuit, but they were wired direct/hot through the red wire into the module. The PCM controlled the ground through the module with the smaller wire (blue or red/orange). Some of these modules had a 2 speed operation and some were variable speed ( I think )

Anyway you can cut out or bypass the module and use the 2 wires black and red going directly into the fan for a constant high speed op. You can wire in one of those bigger relays for control, or even go to a parts store and get a heavier duty one. The temp sensor will not do you any good because is does not act like a switch to control the fan, but its a variable input to the PCM to tell it how hot the engine is, then the PCM controls the fan speed through the fan module with a pulse/width-modulated ground.

I think they used that particular design with the module around 03 and up ( not sure ) the earlier year C-vics had a static 2 speed fan using 3 wires, 1 power wire for low, 1 power wire for high, and 1 common ground. Kinda looks like the build date code on the module is 02-08-06?

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post #6 of 12 (permalink) Old 06-13-2010, 01:29 PM Thread Starter
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There are three wires coming out of the box and the fan. Two are larger than the third. I hooked the two larger ones to an 18V battery from my drill and the fan kicked on. I sure do appreciate everything you just told me. However I do nto undertsand soem of it. Thsi is my first time messing with something like this. Can you dumb it down a bit? What is it I reuire for the fan to operate as it was intended by the OEM?
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post #7 of 12 (permalink) Old 06-13-2010, 09:20 PM
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looks like a decent fan. pretty similar to my taurus fan.

Garrett






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oh well, i have a map to the darkside

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post #8 of 12 (permalink) Old 06-14-2010, 02:14 AM Thread Starter
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I wnet to a friends place today and was telling him about the fan issues I am having. He said "well take a look at this". And sitting on a barrel was another fan but with out the box and reervours mine has. We hooked it up to see if it ran and it does. it is alos a two speed and has the same mounting positions and diameter as the one I had.
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post #9 of 12 (permalink) Old 06-14-2010, 09:09 PM
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Sounds like the other one you found was what they used before they came out with the module controlled one in the first pick. The second fan you have used 2 relays 1-high, 1-low and shared the ground.

The first fan with the module is basically a variable speed ( controlled by module via pcm/ground ) The pcm could ground the module for high speed, or pulse the ground intermittantly for variable speed. This function works much like the A/C blower motor would on automatic temp controlled vehicles.

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72 AM General M35A2, LDT465-1C "Whistler" Turbo, PTO winch.
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post #10 of 12 (permalink) Old 06-14-2010, 10:44 PM Thread Starter
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How do I get the first fan to work as it is intended with out the PCM.
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