VAST EFK Wiring issues

**s vier** · 07-20-2008 03:03 PM

If you have installed a VAST EFK on a car before, did you get a relay with 5 connection points? I seem to have places for 4 connections as well as a diagram of 4 but there are 5. any help would be great especially if it were a picture you took of your wiring. Thanks.

**lowered97a4** · 07-20-2008 03:14 PM

i used 4 wires i didnt use the blue wire i think might have been the 87a u dont use not sure. I had a problem finding a signal wire i got pissed off and hooked it up to my foglight switch

**s vier** · 07-20-2008 03:25 PM

http://www.audizine.com/forum/showth...ght=vast+relay

This post by JHM contradicts VAST's instructions. Jason says to use #86 to pos battery but that's where #30 goes. These instructions are like reading a rock...pointless.

Something is wrong when it takes me longer to do an EFK than it does a timing belt....6 hours and I'm only halfway done with this confusing ass mod.

**BastardS4** · 07-20-2008 03:37 PM

Because we are talking about two different trigger methods. a ground trigger via the thermostat sensor, and a 12V trigger via the AC fan wire.

**s vier** · 07-20-2008 03:51 PM

Would it be possible for you (or someone else) to slowly talk me through the wiring assuming I know nothing about the 2 ways and or what a "ground Trigger" is? I have the car apart, a relay with 5 wires and VAST's "instructions" aka Charmin in front of me. I've learned the hard way that these are not color coded though that would have been the customer friendly way of doing it. I've read several other posts about people not understanding these instructions and yet I have found no updates or pictures with how to really do it.

I'm sure the 2nd time I do this it will take 10% of the time this first one took.

**s vier** · 07-20-2008 03:53 PM

I want to have the fan come on with the AC and when the temps get to 95.

**BastardS4** · 07-20-2008 03:55 PM

ground trigger then, as Jay describes.

**s vier** · 07-20-2008 04:29 PM

sigh....

So are VAST's instructions wrong?

Could you please, please, please walk me through it because here is what I think I am seeing /Reading:

there are 2 ways that the fan will come on. One is when the AC is turned on and another is when the coolant is at or above 95 degrees.

In order to do this it needs to be connected to both the AC fan AND a "T" wire or "ground trigger?" needs to be ran off of the fan wire. This will do the 95 degree part.

The AC fan part will be triggered by the AC being turned on and to do this #86 needs to be tapped into the AC fan.

#30 needs to be ran to the fuse holder which then goes to the positive terminal of the battery.

This leaves me with 87a. A Blue wire in the middle of the relay that doesn't go to anything.

I also have no real "ground" as I know a ground to be.

So where am I derailing here?

**lowered97a4** · 07-20-2008 04:40 PM

87a doesnt get used, sounds right the way u said it.You hook terminal 86 to battery +. Then tap into the brown green wire and run that to Terminal 85, thats the part i got confused

**lowered97a4** · 07-20-2008 04:41 PM

the brown green wire is from the ac fan?? im gonna rewire it right now it was dark so i couldnt see colors im gonna look now

**s vier** · 07-20-2008 04:47 PM

Where is the unit grounded then? And if #86 is ran to (+) battery then what do you do with #30 that VAST says to run to (+) battery?

**lowered97a4** · 07-20-2008 05:09 PM

30 is the main power its fused to the relay. 86 can goto the foglight switch for power for instance like i had it. the other way of doing it i cant find a brown green wire that goes on and off with the fan im confused on that part

**coop** · 09-09-2011 12:27 PM

Has anyone hooked it up (like above) and then to the fog as a manual override?

**andream88** · 09-09-2011 03:19 PM

I have hooked it up per JHM instructions and then to a switch as a manual override. It's not the best way to do it imho.

Doing so, the fan will kick in everytime you start the climate control (even at 100+mph, when it's not needed at all). Moreover, the aux water pump will kick in with the ignition off every now and then....with no apparent reason (even when the car is cold).
I added the manual override switch to solve these issues. But it's not ideal.

The best way to wire a EFK up is to use a thermoswitch, REVOTEC in the UK do some nice units imho ;)

HTH

**S4James** · 09-09-2011 03:24 PM

This ^ I have to hit the "econ" switch and kill the AC in order to have the stupid fan turn off. Not the best way, but i do like it kicking in when i park the thing and the th thermostat triggers it.

**coop** · 09-10-2011 10:18 PM

Thanks for your responses. I would think there would be a way to do this properly. Anyone else have better luck? TIA

**The_Auto_Tech** · 09-10-2011 10:47 PM

Yes, the only problem with wiring it that way is that it's always on when the A/C is on, which does suck because you don't need it running on the highway. I thought of finding a way to wire it up to a temp switch or something that would shut it off once you were on the highway. I have noticed the aux pump kicking on every now and then, but it's only for like a few seconds and doesn't "hurt" anything or annoy me. The nice thing about wiring it up this way though is that if you just finished running the car hard and it's still warm the electric fan can actually come on when the ignition is off to help cool the motor down. Other than that it comes on when the A/C is on or when the car hits a certain temperature with the A/C off. Does anyone know what the blue wire is supposed to be for? It seems like it's actually a power wire. Mine is just wrapped in heat shrink and tucked away.

**andream88** · 09-11-2011 01:45 AM

I bought this, which can be installed in the top radiator hose:
http://www.revotec.com/details.asp?ID=454

Never got round fitting it as my EFK has blown and i've reverted everything back to stock ;)

However, i thing that is the best wiring option out there for a EFK.

**Korben007** · 09-20-2011 07:42 AM

If you are removing the front fan couldn't you just clip the plug off that solder it into new fan and it would essentially take it's place?

Sent from my iPhone via Tapatalk

**Korben007** · 09-20-2011 09:09 AM

also wouldn't this enable the fan to be run at low speed when in after run mode rather then at full speed like when its wired to a relay. Is the Vast/JHM fan motor able to be run at half speed like the stock front fan is?

**crc364** · 09-24-2011 10:39 PM

^I think it would do this, but am curious if anybody knows from experience.

**Korben007** · 09-25-2011 12:02 AM

I did it. It works great!

**LowA4** · 09-25-2011 02:43 PM

Doing this today or tomorrow.

**The_Auto_Tech** · 10-03-2011 09:07 PM

Originally Posted by Korben007

I did it. It works great!

It seems like wiring it that way would delete the purpose of doing the EFK setup. It wouldn't be able to run at full speed.

***Blue-Angel*** · 10-03-2011 09:41 PM

Y Would it not run at full speed because of using the AUX fan wires......

**The_Auto_Tech** · 10-04-2011 06:06 AM

Originally Posted by *Blue-Angel*

Y Would it not run at full speed because of using the AUX fan wires......

I took it in the sense that he wired around the relay and just used the aux fan wiring without the relay. It shouldn't be able to run at full speed, or that I would forsee issues with blowing fuses without the relay being used.

**NOTORIOUS VR** · 10-04-2011 06:56 AM

Originally Posted by The_Auto_Tech

I took it in the sense that he wired around the relay and just used the aux fan wiring without the relay. It shouldn't be able to run at full speed, or that I would forsee issues with blowing fuses without the relay being used.

I would think the same... plus I would want to risk blowing up my fan controller for it...

My high flow Spal fan from VAST pulls A LOT of current, that I know for sure... far more then the little aux fan.

***Blue-Angel*** · 10-04-2011 07:28 AM

That fan is already relayed so you wouldnt need the one from VAST if wiring it that way. I have had mine set up that way for a very long time and not problems. It runs geat that way. Does exactly its job as designed.

**NOTORIOUS VR** · 10-04-2011 07:57 AM

Originally Posted by *Blue-Angel*

That fan is already relayed so you wouldnt need the one from VAST if wiring it that way. I have had mine set up that way for a very long time and not problems. It runs geat that way. Does exactly its job as designed.

you're running the high flow fan through the OE Aux fan wiring/fan controller?

I know it's probably much to ask, but I'd love to see a vid of the can coming on and running @ high speed with that setup. I highly doubt the fan controller was designed to bear that kind of load considering the dinky fan that was originally on the circuit (aux AC fan).