Radiator Fan OVERRIDE SWITCH ???
Thread Starter
Burning Brakes
Joined: May 2006
Posts: 857
Likes: 1
From: Morrisonville Illinios
Radiator Fan OVERRIDE SWITCH ???
OK gang I have an 87'vert with the hd cooling system. Well now neither one of my cooling fans will come on no mater what, they won't come on 
even when the a/c is on. I did have the ECM reprogrammed so they would come on at 180deg but now Nothing. Since I have to figure out why they won't come on I thought that this might be the time to install an OVERRIDE SWITCH so I can have them on when I want to. Is there an EASY way to do this.
THNAKS GANG wro87
even when the a/c is on. I did have the ECM reprogrammed so they would come on at 180deg but now Nothing. Since I have to figure out why they won't come on I thought that this might be the time to install an OVERRIDE SWITCH so I can have them on when I want to. Is there an EASY way to do this.THNAKS GANG wro87
Team Owner
Joined: Mar 2001
Posts: 54,124
Likes: 30
From: Cincinnati, Oh USA
Its easy, put a toggle switch in parallel with the green/white wire on the main fan motor relay to ground. Of course, it won't do any good if the fan motor is dead, so unplug it and jump 12v to the motor wires to prove its ok. Check the motor wire ground connection, they get corroded and no longer go to ground when old. Check the 3 amp C fan fuse first with an ohmeter. If fuse is ok and the fan motor is ok, then ground the green/wh wire with the ign sw in run and see if the relay closes and the fan motor runs.
Thread Starter
Burning Brakes
Joined: May 2006
Posts: 857
Likes: 1
From: Morrisonville Illinios
Thanks Guys I will start checking just got the back-up light switch done on the C3 and My Oldest son is on his Way home From IRAQ 
( 2 week leave) and I have been getting his ride all cleaned up! So tomorrow I will get on the the relays and switch.
Thanks wro87
I just have a hard time that both of the fans quit at the same time?
( 2 week leave) and I have been getting his ride all cleaned up! So tomorrow I will get on the the relays and switch.Thanks wro87
I just have a hard time that both of the fans quit at the same time?
Last edited by wro87; Jul 12, 2009 at 11:21 PM.
Race Director
Joined: Feb 2003
Posts: 11,672
Likes: 20
From: Lake Wylie SC
Thanks Guys I will start checking just got the back-up light switch done on the C3 and My Oldest son is on his Way home From IRAQ ( 2 week leave) and I have been getting his ride all cleaned up! So tomorrow I will get on the the relays and switch.
Thanks wro87
I just have a hard time that both of the fans quit at the same time?
( 2 week leave) and I have been getting his ride all cleaned up! So tomorrow I will get on the the relays and switch.Thanks wro87
I just have a hard time that both of the fans quit at the same time?
You make sure he knows all of us appreciate his service.
Thread Starter
Burning Brakes
Joined: May 2006
Posts: 857
Likes: 1
From: Morrisonville Illinios
STRICK WILL DO 
. Proud Father of Son in US ARMY. Also I have more news while in Iraq this time, he has bought a 92'ZR1 Black/Red.
Our plan is to fly to New mexico and drive back this Friday should be a rather interesting 11oo mile trip home. Man he has ordered a new Escort Radar detector and he is ready to go get his new ride.
So now I will have to get him set up on the FORUM.
Thanks GANG.
wro87
. Proud Father of Son in US ARMY. Also I have more news while in Iraq this time, he has bought a 92'ZR1 Black/Red. Our plan is to fly to New mexico and drive back this Friday should be a rather interesting 11oo mile trip home. Man he has ordered a new Escort Radar detector and he is ready to go get his new ride.So now I will have to get him set up on the FORUM.
Thanks GANG.
wro87
Thread Starter
Burning Brakes
Joined: May 2006
Posts: 857
Likes: 1
From: Morrisonville Illinios
wro87
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Team Owner
Joined: Jan 2003
Posts: 20,315
Likes: 245
From: Summerland B.C. Canada
Ok Gang dug out the FSM and it shows Hd fan option but I cna't find the drawing for the other fan, but just where in the car are the relays and the fuse that is what I am now having problems finding. I have a extra switch now and will be installing an override might use two switchs so I can control both fan seperately. what you guys think of that.
wro87
wro87
Aux fan relay is on front left corner of rad shroud, below the tiny hood strut.
Cooling fan fuse is in the main fuse panel. Both fans have a fusible link, they are orange and are below main fan relay.
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
The 2 fans have 2 seperate controls methods
Main fan controlled by computer; aux fan controlled by switch in drv side head.
Ground out the wire to this switch and see if aux fan runs
