Installed manual fan switch

CManT1914

New Member
Feb 5, 2004
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Killeen, Texas
I installed a manual low-speed fan switch this afternoon. I have the switch mounted for the high-speed fan, but didn't get around to wiring it. But even with the low-speed fan on, I don't see above 192* now. Engine runs a LOT cooler, and it only cost me like $15 for both switches and in-line fuses. I'm gonna finish wiring the high-speed fan tomorrow.

The right switch is the low-speed fan switch, the left is the high-speed (which isn't wired yet).
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And here's where I run now. :banana:
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For those of you who want to do it, here's some tips.

A good spot for the switche(s) is in front of the shifter in the bezel, a good amount of room behind there, and you have a ground and 12V source right there (power point). Another good spot, although I would recommend it only for coupes, is in front of the center console, above the foglight switch (and convertible switch if applicable). I wouldn't recommend using this as a spot for a vert however, because the only good close 12V source is the 'vert harness, and vert guys are using this. And if you're like me, then you already have your foglights wired into this also. The fan might be to big of a load for this single wire.

For the switch, you can use a 3-way toggle switch (for high and low-speed on one switch) or use 2 different rocker switches. If you use a 3-way, hook up the wire from the Pin 14 to one terminal, Pin 17 to the other, and then of course a ground (according to the write-up in 94/95 FAQ section, I'm not positive on this, as I used two seperate rocker switches). For the 2 individual rocker switches, on the low-speed fan switch, hook a 12V source (preferably ignition-hot only) (or use the one for the power point, it's constant hot but that's okay) to the power terminal, a good ground (like the one for the power point in front of the shifter) to the ground terminal, and run a wire from the accessories terminal to Pin 14 on the CCRM (dark blue wire). I'm not exactly sure how the high-speed fan hooks up yet, I haven't wired it. But I think you're supposed to run the ground to the power terminal on the switch, then the wire from Pin 17 to the accessories terminal, and I guess the 12V lead goes on the ground terminal. I will verify this information tomorrow hopefully.

I would not recommend using the power point while you have one of the switches turned on, it might be to heavy of a load for it. Better now risk it. If anybody wants more pictures, let me know tonight or early in the morning, cus I can take more tomorrow while I'm wiring the high-speed switch. If anybody is thinking about doing this, don't be afraid!! I was a little unsure of doing this since I'm not very good at electrical stuff, but it was SUPER easy! If you can wire gauges, you can sure as hell do this, lol. Let me know if you need some more tips, I'll be glad to help. :nice:
 
CManT1914 said:
For the switch, you can use a 3-way toggle switch (for high and low-speed on one switch) or use 2 different rocker switches. If you use a 3-way, hook up the wire from the Pin 14 to one terminal, Pin 17 to the other, and then of course a ground (according to the write-up in 94/95 FAQ section, I'm not positive on this, as I used two seperate rocker switches).
Chris, Nice work getting it all done (I sent you a PM, but I think it was too late. :( ).

I would not use a 3 way switch - generally the 3 way switches will send connect the 'power' terminal feed to both positions. Since low speed gets 12 volts and high speed gets ground, this might not work too well. :)

Otherwise, very nice job - glad you are happy with it (it is a must do, IMHO, as you know). :nice:
 
5.0_GT_kid said:
With the car running cooler, could you feel a difference when driving it?

As far as power? No, but it was POURING down rain here all afternoon, with hail (luckily I was inside working on the stang when it hit) and some freaking tornadoes!! :eek: So needless to say I didn't get on it coming home. I'll let you know when it dries out, at this rate some time next year, lol.

HISSIN50 said:
Chris, Nice work getting it all done (I sent you a PM, but I think it was too late. :( ).

I would not use a 3 way switch - generally the 3 way switches will send connect the 'power' terminal feed to both positions. Since low speed gets 12 volts and high speed gets ground, this might not work too well. :)

Otherwise, very nice job - glad you are happy with it (it is a must do, IMHO, as you know). :nice:

Yea I replied to your PM, thanks JT. I didn't like the 3-way switches anyway, lol.
 
UPDATE:

I wired up my high speed fan switch last night. It was a lot harder to do than the low-speed, because the wire I had to tap into was in the middle of the CCRM connector. PITA to get a connector and my pliers down there!

Here's how to do it. Run a wire from Pin 17 on the CCRM (it's green with a purple stripe) to your accessories terminal on the switch. Now here's the trick. Run a wire from a 12V source (you'll really want key-hot only on this one) to your GROUND terminal on the switch. If you have a lighted switch (like the kind with the LED in them) then run a ground wire to the POWER terminal on the switch. Don't ask me why the high-speed fan works like this, I'm really not sure. But the reason you want a key-hot only lead is because I wired mine to my power point right there in the bezel (constant hot). It's not problem for the low-speed switch, but now when the car is off, the high-speed switch will light up faintly. When I start the car (or just have the key in the "on" position), it will go off. So it would be best to have it wired to a key-hot source, but I can live with a switch being partially lit (I say partially, cus it glows real faintly when the car is off, not as bright as when you actually flip the switch :shrug:) when the car is parked.

When running two seperate switches for low and high speed settings, you will probably want to turn on the low-speed fan first. Then you can flip the high-speed fan on, it's probably easier on the fan that way. But here's the catch, with BOTH switches flipped, the high-speed fan doesn't run at high-speed. For some reason, it runs at medium speed. :scratch: I don't know, but when I turn the low-speed switch off, then it kicks up even further to high-speed. :shrug: lol

Definitely a worthwhile mod, since it only cost me $12 ($6 for the switches and $6 for the in-line fuses). Now I run at a steady 180-185* while driving. It actually dipped below 180* earlier on my way to work. Just ask if you need pics or more info.
 
Drawbacks of running high speed: increased charging system draw. I do use low speed first, since the fan was not designed to go from off to high speed.

Those pins are on the control side of the relays for the fan speeds. Some folks have reported catching the wires in the passenger compartment, but I was WAY too lazy to try and find those. I figured I could always switch it around if I found the wires later.
 
I just cut the wires that come out of the fan one is ground the other two are the low and high speed fans. I wired my high speed with my ignition with a seperate relay work perfectly everytime the ignition is on the fan is on. I also mounted a fan on the outside pushing air thru the condensor with a seperate switch.
 
igotyofire said:
heh gonna make emissions a lil higher with cooler temps, hmmz any of you know your previous temps b4 doing this?
The mods most of the folks have do MUCH worse than raising NOx emissions slightly (if that was what you mean). We dont run the switches (well, me at least) unless I need it.

All the fan switch does is phase down the temps. A lot of us like running 180* t-stats, so having a fan come on at ~208/228* (low/high) is kinda wretawded. Whether or not I use my fan (I dont use high speed hardly ever), in 110*F temps, i stabilize at ~210*F operating temps while idling. The fan switch just allows me to idle for a bit longer before reaching that temp. But that is the saturation point in regard to heat rejection in the radiator.
 
haulbalz said:
when you do this, do the fans still come on automatialcly?(sp?) or do you always have to control them?
If your fan speeds were working before, they will continue to work now (after the switches).
 
I know this thread is extremely old, but I need to know something before I do this. It was said that if both fans are activated via the switch, it will be in "medium" speed. So, say you have your high speed turned on via the switch and it's time for the computer to turn on the low speed. Would you in fact be running in "medium" speed when this happens?
 
I know this thread is extremely old, but I need to know something before I do this. It was said that if both fans are activated via the switch, it will be in "medium" speed. So, say you have your high speed turned on via the switch and it's time for the computer to turn on the low speed. Would you in fact be running in "medium" speed when this happens?

If you have high speed on and temps are still going up (towards the low speed threshold), there's probably an issue.

I suppose one could rewire the fan connector with diodes and have high speed come on no matter what the input is (low or high).

I honestly doubt it's something you would deal with so I might wire it up how you desire and deal with any issues that come about.

Good luck.
 
I haven't done it yet. I'm about to in a few minutes. I put a supercharger in and now my temps are getting a little too high for confort, but as soon as I turn the air on it goes right back down to normal.

High speed fan comes on with A/C on high, correct? If this is true, then the car will go right to high speed when the A/C is on, so I don't need to install a low speed switch. I'm gonna try it with just a high speed and see what happens.

An electric motor is an electric motor so it shouldn't matter what speed you start with.