Fan switch
07-19-2008, 05:32 PM
#32
3rd Gear Member
Join Date: Nov 2006
Location:
Posts: 671
RE: Fan switch
So, in order for the fan to come on, the engine will have to be up to operating temp so the PCM will call for it to be on?
What happens when the temp drops below operating temp? Will the fan shut off even though the switch is on?
What happens when the temp drops below operating temp? Will the fan shut off even though the switch is on?
07-19-2008, 09:45 PM
#33
1st Gear Member
Thread Starter
Join Date: Nov 2006
Location: Saginaw
Posts: 86
RE: Fan switch
I have another question, is it possible to wire it up with just a switch, i dont want to start cutting and grounding wires i just wanted to be able to turn the fans on whenever i wanted.
07-20-2008, 04:39 AM
#34
Join Date: Jun 2008
Location: Reading, PA
Posts: 18
RE: Fan switch
ORIGINAL: digitalmixx187
I have another question, is it possible to wire it up with just a switch, i dont want to start cutting and grounding wires i just wanted to be able to turn the fans on whenever i wanted.
I have another question, is it possible to wire it up with just a switch, i dont want to start cutting and grounding wires i just wanted to be able to turn the fans on whenever i wanted.
07-20-2008, 09:52 AM
#35
Cut & Paste Expert
Join Date: May 2007
Location: NW Arkansas
Posts: 13,322
RE: Fan switch
ORIGINAL: 06VistaBlueGT
For S&G's I grounded 86 on the PCM and high speed relay.
Good call. F40 was blown. Back out to the garage to try again.
For S&G's I grounded 86 on the PCM and high speed relay.
ORIGINAL: 157db
About the only thing you could have damaged with the S&G you did
would be to cause a short to 12VDC and F40 would have popped.
Grounding improperly hooked up wires in this situationcannot harm
the PCM in any way.
About the only thing you could have damaged with the S&G you did
would be to cause a short to 12VDC and F40 would have popped.
Grounding improperly hooked up wires in this situationcannot harm
the PCM in any way.
relay #20 and F40 blew. I woulduse terminal 85 on theHiSpeed fanrelay.
You have already determined that the 12VDC feed to theHiSpeedrelay
is terminal 86 by blowing F40.
And use terminal 86 on thePCM relay.
ORIGINAL: 06VistaBlueGT
So, in order for the fan to come on, the engine will have to be up to operating temp so the PCM will call for it to be on?
What happens when the temp drops below operating temp? Will the fan shut off even though the switch is on?
ORIGINAL: 157db
Now for the HiSpeed relay. With the key on and the engine not running, confirm
that the cooloing fan is not running and check the HiSpeed relay wire for 12VDC.
It should show 12VDC with the HiSpeed cooloing relay off and no voltage with
the HiSpeed fan relay on. You will have to get up to operating temp for the PCM
to call for HiSpeed cooling.
Now for the HiSpeed relay. With the key on and the engine not running, confirm
that the cooloing fan is not running and check the HiSpeed relay wire for 12VDC.
It should show 12VDC with the HiSpeed cooloing relay off and no voltage with
the HiSpeed fan relay on. You will have to get up to operating temp for the PCM
to call for HiSpeed cooling.
What happens when the temp drops below operating temp? Will the fan shut off even though the switch is on?
The fan will run until you flip the switch off or
the battery dies, which ever comes first.
ORIGINAL: digitalmixx187
I have another question, is it possible to wire it up with just a switch, i dont want to start cutting and grounding wires i just wanted to be able to turn the fans on whenever i wanted.
I have another question, is it possible to wire it up with just a switch, i dont want to start cutting and grounding wires i just wanted to be able to turn the fans on whenever i wanted.
inserting 20 gage wires into a terminal under each relay. It seems to be
terminal #86 on the PCM relay #20 and terminal #85 on the HiSpeed
fan relay #25. Reinsert the relays in the sockets they came out of and
ground the wireswith a DPST switch and itsthat simple.
No cutting wires of any kind. Totally reversable. No hack jobs here.
ORIGINAL: traxxton
Good question. Is it that simple? I am a little lost with everything so far.
Good question. Is it that simple? I am a little lost with everything so far.
10-12-2008, 08:10 PM
#38
3rd Gear Member
Join Date: Dec 2006
Location: Bullard, Tx.
Posts: 533
There are PIV diodes on the relays. I thought they were INSIDE the relays.
They must beIN THEBEC wiring under the socket for the relays. This will throw
a wrench in the works if you use a DVM to test the circuits.
If the darn electrical diagram I have printed for the 2007 was not different
from the online one thats available, it would be pretty simple.
I see that you have an 2006 stang.
Lets go about this in a different way.
http://iihs.net/fsm/?dir=40&viewfile...ling%20Fan.pdf
Remove PCM relay #20 and insert a wire into terminal 86 and reinstall the relay.
Now remove the HiSpeed fan relay #25 and insert a wire into terminal 85 and
reinstall the relay. With the key off, use a TEST LIGHT and checkthe PCM relay
wire for 12VDC. If the wire is correctly hooked up, you should see 12VDC with
the key off but see no voltage when the key is turned on.
If you now ground that wire with the key off, the PCM relay should click on.
Now for the HiSpeed relay. With the key on and the engine not running, confirm
that the cooloing fan is not running and check the HiSpeed relay wire for 12VDC.
It should show 12VDC with the HiSpeed cooloing relay off and no voltage with
the HiSpeed fan relay on. You will have to get up to operating temp for the PCM
to call for HiSpeed cooling.
Or you can ohm between the Brown/Pink wire on C1035B on the bottom of the BEC
and the 85 & 86 terminals for the PCM relay to find the correct terminal # to connect to.
Same with the HiSpeed fan relay. Ohm between the LiteGreen/Violet wire on C1035C
on the bottom of the BEC and the 85 & 86 terminals to find the correct terminal #
to connect to.
They must beIN THEBEC wiring under the socket for the relays. This will throw
a wrench in the works if you use a DVM to test the circuits.
If the darn electrical diagram I have printed for the 2007 was not different
from the online one thats available, it would be pretty simple.
I see that you have an 2006 stang.
Lets go about this in a different way.
http://iihs.net/fsm/?dir=40&viewfile...ling%20Fan.pdf
Remove PCM relay #20 and insert a wire into terminal 86 and reinstall the relay.
Now remove the HiSpeed fan relay #25 and insert a wire into terminal 85 and
reinstall the relay. With the key off, use a TEST LIGHT and checkthe PCM relay
wire for 12VDC. If the wire is correctly hooked up, you should see 12VDC with
the key off but see no voltage when the key is turned on.
If you now ground that wire with the key off, the PCM relay should click on.
Now for the HiSpeed relay. With the key on and the engine not running, confirm
that the cooloing fan is not running and check the HiSpeed relay wire for 12VDC.
It should show 12VDC with the HiSpeed cooloing relay off and no voltage with
the HiSpeed fan relay on. You will have to get up to operating temp for the PCM
to call for HiSpeed cooling.
Or you can ohm between the Brown/Pink wire on C1035B on the bottom of the BEC
and the 85 & 86 terminals for the PCM relay to find the correct terminal # to connect to.
Same with the HiSpeed fan relay. Ohm between the LiteGreen/Violet wire on C1035C
on the bottom of the BEC and the 85 & 86 terminals to find the correct terminal #
to connect to.
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