Got Fan Mod? Hot Weather is Coming!

[JimTurner]

ALL:

I have completed my Fan Mod design and was going to post in the morning after taking a quick peak at an SRT8, but since you are all SO interested, here you go:

http://members.cox.net/jdturneriii/300C/LXFanMod.pdf

** PLEASE NOTE THAT I HAVE NOT LOOKED AT THE SRT WIRING TO SEE IF THIS APPLIES OR NOT **

The Mod will offer you the following characteristics:

1. NO SPLICING INTO THE WIRING HARNESS! <-- A plus for me
2. NO CODES!
3. BOTH FANS ON HIGH WHEN ENGAGED!
4. OPTIONAL CONTROL WIRING to give you the following:
a. Turn Fans On ONLY When Engine is running
b. Turn Fans On Regardless of Engine State
c. Wire for BOTH options a. and b. (Slightly more complex wiring but not that bad).

I spent somewhere between $30 and $40 for the parts for this.

I've had this mod installed on my car for over 2 weeks and it works great.

Here is a picture of the installation.



Please let me know if you have any questions.

Regards and Happy Cooling!

jimt

[Lost815]

Has anyone completed this mod. I have parts on order but was wonder wich wires go were, also would it be possible to do the 25 cent fan mod and just coneect a switch to it?

[Jaak]

SRT's the same...

[PowerWagon896]

Has anyone completed this mod. I have parts on order but was wonder wich wires go were, also would it be possible to do the 25 cent fan mod and just coneect a switch to it?

No, the 25-cent fan mod replaces the relays with jumpers, this mod uses another set of relays to fire the OEM relays.

It is a bit intimidating, but I keep re-reading each part until I completely understand it. Then I move to the next step.

[Jaak]

There is a simpler mod, but it requires cutting into the factory wires so this one's good if you want to be able to disconnect and remove it when you bring in the car for service.

[Rev.Hammer]

There is a simpler mod, but it requires cutting into the factory wires so this one's good if you want to be able to disconnect and remove it when you bring in the car for service.

Tell us about this o'mighty flinger of far out facts!!

[Jaak]

LOL! You always crack me up Rev!

I worked it out when Jim did this one, but Jim's a heck of a lot better at documenting things...

I'll have to dig out my scribbles and document it. It's interesting, while doing this, I discovered the relays have a resistor built in to them in parallel with the coil. Got too many things to document and do! (LED flasher control, fan mod, rain sensor, IAT sensor fake out. Thankfully the Uconnect works... Where the heck is JetPilot with those harnesses, anyway?)

Jim's mod is great because you can yank out the whole thing and drive in to the dealer whistling like nothing's been touched, when you do your warranty claim.

I'll try to post the other one on the weekend, if I can. (Although Saturday is drag racing at Grand Bend. IHRA. So we'll see!)

[RobAGD]

I am doing the simple version of this mod, and its acting a bit weird. I have been talking with Jim about it, and when I get a little time I am going to start probing the relays and see why mine is not responding liek it should.

I have a 05 Magnum and i know the Jim did this on an 06 300c, so maybe some minor changes.

-R

[Jaak]

Well, I couldn't resist, I went and dug up what I had planned, back when it was too friggen cold to want to do it. I had set it aside to do it in the warmer weather.

Well, the idea's great, it controls the stock relays and fakes out the FCM to think life is good and all is happiness. But, there's one hitch. I went out and actually looked at where I need to make the two cuts and connections, and it's inside the Integrated Power Module. There's two connections from the FCM to drive the relays, which is what I modify, but it's all inside the module, so access means drilling out the two plastic anchors and pulling the module apart, to get to the connections.

So in otherwords, while it's a more elegant solution electrically, it's not something I'd want to post on here for people to do as mechanically it's a bit of a PITA. You'd end up having to tear in to a module that would definately put you in a position of trashed warranty. (That's what happens when you work off schematics only!)

There is an alternate way of implementing this, that I'm going to look at. However, Jim's mod is certainly an excellent non-invasive way of doing this and I'd recommend it.

Jim, one note on your instructions. Instead of removing the anchor for the power lead, why not just remove the 13 mm nut that holds the wire on? You can swing the power lead out of the way, without removing the anchor and since you have to loosen it to tap off power for your relays, you'll have the wrench/socket in hand anyway.

I only mention this, because my anchor did not want to come out, and I really didn't want to snap it off, when I went to flip the IPM up to have a closer look.

[357mag]

jim is ther anyway to take a few more pics of the where the wires plug into?

[Nightshade]

You were gonna post a better way to trigger the relays Jim.. it's warm out now.. heh

There is a simpler mod, but it requires cutting into the factory wires so this one's good if you want to be able to disconnect and remove it when you bring in the car for service.

[Jaak]

Well, there's a couple of thoughts... The best wiring mod, means tearing apart the module, so while electrically it's good, mechanically it's a bit of a nightmare. So I bailed on that one.

Another way is to use a scan tool, as there is a command to turn on the fans to test them. The autoenginuity tool may be able to do this, but they're still working on updates for the LX and it's going to be two software revs away. Since it's a generic tool, it doesn't move as fast as I'd like for the LX. But it would be possible to send a command on CAN bus to turn on the fans, which would be the more elegant solution.

[Nightshade]

Well, there's a couple of thoughts... The best wiring mod, means tearing apart the module, so while electrically it's good, mechanically it's a bit of a nightmare. So I bailed on that one.

Another way is to use a scan tool, as there is a command to turn on the fans to test them. The autoenginuity tool may be able to do this, but they're still working on updates for the LX and it's going to be two software revs away. Since it's a generic tool, it doesn't move as fast as I'd like for the LX. But it would be possible to send a command on CAN bus to turn on the fans, which would be the more elegant solution.

Sounds like a job for MMMMMMMMMMMMMMMMMMMMMORPHEUS!

[Jaak]

Anything that can talk on the bus would do it... Just have to know what the commands are!

[bigjim]

Hmmmm, I have no fan mod, stock thermostat (intended to keep the engine at the designed operating temp), I sat in traffic at the border returning from Toronto on the fourth of July weekend start (Canada day) for 3 hours with ac running and saw it stay at 208f (after I popped it into neutral, 238f in drive). I don't understand the desire to cool the engine into the excess emissions range (the temp helps "burn" the fuel more completely).

Can someone help me understand why you would want to always run out of spec for the few moments of added power (I understand the added 5 - 8% more horses it makes at lower temps from fooling it into more fuel)?