1g slim line fan install

[daddyo]

I installed two spal 12" slim line fans in my 91 Laser. Today car overheated. Question is did I need to retain the sensor/ thermo that is bolted on the drivers side? I disconnected it becuase it was on the ac fan and I do not have ac anymore.
I did read the vfaq on the wiring but i did not want to hook it up to a switch.The way i wired it was I used the plugs/wiring on the passenger side. I retained the plug behind the pass headlight and the plug that goes into the bottom of the radiator. I then spliced from there into the two fans. After install I did test to make sure they kicked on.
They both would kick on but only for 10 seconds. Have not driven car for a week and this morning it overheated. So my question is, Do I need to do anything with the box/sensor that bolts on to the AC fan. I know I can just wire it to a switch and be done but that is not my goal.

 

[LandoAWD]

The easiest way to do it is to retain ALL stock plugs and wiring, then use two donor plugs from factory fans and wire the slims to those. Connect it up and control the fans with the AC control.

 

[XiKeiyaZI]

The easiest way to do it is to retain ALL stock plugs and wiring, then use two donor plugs from factory fans and wire the slims to those. Connect it up and control the fans with the AC control.

This is how I installed mine and never had an issue with overheating.

 

[daddyo]

That is the easiest. I however do not want to do it that way. I have taken out all ac components including switch. The only thing I left was some of the wiring in the engine bay. It is my understanding that the radiator fan is controlled by a temp sensor. I would like my fans to kick on with the temp not with a switch. My only question is, the box that is on the ac fan is that part of the temp sensor and does it need to be wired in so that my fans work properly?

I have replaced ac switch with shift light. Not that that would matter as that is not how I want it wired anyway.

 

[LandoAWD]

Temp only? Wire them in series off the passenger side connections. May need a relay/fuse; not sure how to do it the way you want it, only the two you don't.

 

[daddyo]

That is the way I have them wired well not in series but in parallel. In series I would think it would cuase one of the fans to push instead of pull since they are not dedicated pollarity. I am at work at the moment and my car is at home. I have not had a chance to go over the wiring.
Since the install though I have been wondering about the box on the ac fan/driverside. I do appreciate your guys quick responces. Is there any one that has wired there fans this way?

 

[projekt1]

I wired my dual FAL fan setup the way you want it becuase that's the way I wanted. Well I ended up burning up the stock connection hookup (the stock switch where oem setup is connected) but only after a 400 mile drive. Before that they were running fine. I guess the constant starting of the fans in the heat and drive just finally gave.

I recently placed a single pusher on the driver side wired up alone to the stock connection. Tested it by turning on the fan and a/c (with car off and I don't have a/c) but for some reason I don't think it's kicking on on its own. I also have a puller on the passenger side wired up to an actual switch inside the car for just incase the other failed.

I'm now in the same boat as you and I think we need to use a fuse and relay before the stock connection somewhere but I don't know how to do all that either

Electrical gurus give us a step by step porfavor....

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[9!'clipseDOHC]

You do not need the sensor on the driver's side that is mounted to the a/c fan. You will need the thermo switch that is mounted on the bottom passenger side of the radiator. If you want both fans to turn on at the same time you should wire them into the stock fan connector like this:

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Just a note the stock fans flow quite a bit more then the most slim fans so I recently switched back to the stock fan on the passenger side and a slim fan on the driver side.

Hope this helps!

 

[projekt1]

Becuase two slim fans pull so much more than the oem fans do is why I think we need a relay and fuse before the connection. I connected mine just like stock before but ended up frying the connector due to the high current draw.

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[9!'clipseDOHC]

Becuase two slim fans pull so much more than the oem fans do is why I think we need a relay and fuse before the connection. I connected mine just like stock before but ended up frying the connector due to the high current draw.

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Unless you've got two monster slim fans, I doubt they are going to use more amps then the stock fans. What type of fans are you using? I've had both of my slims fans wired into the stock main fan harness for a year now and no problems. Sounds like a wiring issue to me.

**EDIT - I just read that you were using the dual FALs. Is it the 525? If so it draws 19.50 amps which is surely more then the main stock fan. I thought we were talking about the little CX/PR/Ebay slim fans.

 

[daddyo]

Agreed. I will put a dual relay inline on the passenger side to make sure that it is getting enough current without overloading the factory circuit. That was my only question (box on ac fan)
I do know how to wire relays up as I work in Car Audio Installation. We usualy have a ton of doorlock relays leftover from remote starts that are dual five wire relays. You can check with your local shop to see If they have any they can give or sell you. Or you can just buy two bosch relays.

For those that want to wire relays up I will give you an example.
Two relays would be best, but you could use one
Please use this only as a Guide, always test your wires before ever attempting to hook anything up. I cannot be heald responsable for mis-use or lack of testing and verifying of your own connections

87 (which will be marked on the relay) will go to 12 volts at the battery on both relays.
87a will not be needed on both relays
86 will go to the hot wire from the factory fan plug on both relays
85 can go to the ground on the plug or ground it to the chassey on both relays
30 will go to the hot wire on the aftermarket fans each relay will go to its own fan.
This is all assuming that the hotwire on the Factory plug is the trigger wire. If the ground wire is the trigger wire on the fan then you just hook 85 and 87 together and use the ground from the factory plug and hook it to 86.
It is always best to fuse the switch wire 86.

If you are looking for the dual relay, the one I will be using is a 451m from DEI
To wire this up would be easier and since it is enclosed, good for the engine bay.

Take the large gauge purple wire and connect it to the battery. This should have a 15 amp fuse already inline.
Take the smaller blue and green wires and connect them to the turn on side of the factory plug. I believe on mine it was blue.
take the smaller red wire and connect it to ground either on the factory plug or to the chassey.
You will not be using the larger gauge brown/black or white/black
Take the large gauge blue/black and wire it to one of the fans switched wires.
Take the same gauge green/black and wire it to the other fans turn on wire.
Wire the grounds from the fans to the factory plug ground and you should be good to go.

 

[projekt1]

Unless you've got two monster slim fans, I doubt they are going to use more amps then the stock fans. What type of fans are you using? I've had both of my slims fans wired into the stock main fan harness for a year now and no problems. Sounds like a wiring issue to me.

**EDIT - I just read that you were using the dual FALs. Is it the 525? If so it draws 19.50 amps which is surely more then the main stock fan. I thought we were talking about the little CX/PR/Ebay slim fans.

Yep, FAL 525's.

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[daddyo]

You do not need the sensor on the driver's side that is mounted to the a/c fan. You will need the thermo switch that is mounted on the bottom passenger side of the radiator. If you want both fans to turn on at the same time you should wire them into the stock fan connector like this:

Just a note the stock fans flow quite a bit more then the most slim fans so I recently switched back to the stock fan on the passenger side and a slim fan on the driver side.

Hope this helps!

That is exactly how I have mine wired. I was at my friends house when I did the install so was not able to wire the relays in. I will do that when I get a chance. Thanks for all the replies.
On my factory wires I had blue as positive and black as negative and on my spals it was the same colors FYI

 

[KiNg MaRtY]

On my 1g GSX I had two slim fans wired to kick on with the stock sensors BUT I wired them with a relay for each fan with a 10 gauge power wire with a fuse to each. Never had overheating problems that way and ran like that for over 1K miles in CA traffic before I sold the car.

 

[9!'clipseDOHC]

That is exactly how I have mine wired. I was at my friends house when I did the install so was not able to wire the relays in. I will do that when I get a chance. Thanks for all the replies.
On my factory wires I had blue as positive and black as negative and on my spals it was the same colors FYI

If it is wired like that then it is already controlled by the stock thermo sensor and relay. Yes, blue is positive and black is ground on the stock harness.

 

[daddyo]

If it is wired like that then it is already controlled by the stock thermo sensor and relay. Yes, blue is positive and black is ground on the stock harness.

I know that it is wired to run off my temp. My question was only if I needed to hook up the other sensor from the ac fan. I ment to wire it that way. My car overheated and made me question the other sensor. I believe I had overloaded the factory circuit. I am going to wire a dual relay as mentioned above to hopefully fix the problem. I will of course need a bigger fuse for the dual relay then the one it comes with. I will have to measure the amps running through the circuit to come up with the right fuse.
On the the top side of the plug that is behind the pass light the wire colors are blue/red for 12 v and blue/black is the neg. The fan side of the plug is blue 12v and black is ground. At least that is how mine is.

 

[SeanCollins]

When I purchased my talon it had the FAL fans hooked up through the stock harness and ended up melting and shorting out. It was a huge headache trying to figure it out but I think the fans motors went bad due to shorting, is there a way to fix them. Now I have 2 cheapo slim fans hooked to fused line and a relay and it work but the FAL fans look much cleaner.

 

[projekt1]

....the FAL fans look much cleaner.

x2