Fan Relays

yzf-r1 · 10-23-2011, 08:27 PM

Anyone know which one of the four fan relays would cause the fans to stay running after the ignition is switched off? thanks

Garfinkles Motor Works · 10-24-2011, 03:55 PM

Do they run untill you do something to disconnect them OR do they run for about 10 minutes and shut off .The ten minute thing is built in with later models .

yzf-r1 · 10-25-2011, 09:59 AM

hey David - I haven't timed it, but they never stayed running with the ignition switch on before

lt1_fd3s · 10-25-2011, 10:03 AM

To turn the fans on, it's a combination of at least 2 relays... I can look up the diagrams again if you need it because I can't remember the setup off the top of my head...

what have you changed recently that could contribute to the new behavior?

hades · 10-25-2011, 09:14 PM

not to hijack.

But my FD - suddenly fan were not shutting off. I had to pull the fuse to get them to stop. Now fans won't run once temp is reached. But I can turn the car off, then on and the fan come to life. I am assuming it the fan relays. I plan on just replacing all of them.

YZF - rx7.com may be able to help you and order the correct relay at the same time.

yzf-r1 · 10-26-2011, 12:40 AM

Quote:

Originally Posted by lt1_fd3s

what have you changed recently that could contribute to the new behavior?

The car was down for about six months earlier this year for new coolant seals, and I think it was that, plus the fact that it's an 18 year old car - I put some dielectric grease on the relays, combined with just driving the car more frequently now, the problem seems to occur less often, but I'm sure they're still on the way out

I wouldn't mind looking at the diagrams if you can post, thanks

Signal 2 · 10-26-2011, 07:59 PM

Quote:

Originally Posted by yzf-r1

.....I wouldn't mind looking at the diagrams if you can post, thanks

Would this help?
----> http://www.fd3s.net/fan_circuit.html

yzf-r1 · 10-28-2011, 12:08 AM

Yes it does, thanks

rgould · 11-12-2011, 12:20 AM

There is also a recall control module added to the fd's located next to the ecu. It's a little black box that allows the fans to run if the car is turned off and the temp is at a certain range. I have had to replace said box to get this system to work again, before I removed the factory fans and relays from the car when I built a custom cooling system.

yzf-r1 · 11-12-2011, 01:57 PM

I think I've seen this black box, what happens if you just disconnect it?

rgould · 11-12-2011, 03:55 PM

If you remove the box and the adapter wireing harness it will go back to the way it came from the factory . It is just an unplug and replug the harness

yzf-r1 · 11-13-2011, 12:23 AM

Fans run for 10 minutes after the ignition is off, right?

rgould · 11-13-2011, 06:41 AM

Something like that .
I have had that system removed from my car for years and I never put a clock on it when I replaced the control box.
sorry

yzf-r1 · 11-13-2011, 01:51 PM

My biggest concern is draining the battery running the fans that long...

Signal 2 · 11-14-2011, 05:46 AM

Quote:

Originally Posted by yzf-r1

My biggest concern is draining the battery running the fans that long...

Just to confirm...running the wire lead to ground will cause the fans to run 10 minutes after the ignition is turned off but only if a threshold temperature is reached on the engine (can't recall now exactly what it is). So you don't have to worry about the fans running EVERY time you start your car.

As mentioned, if your battery is good there should be no problem and it does help a bit with underhood temps in the summer. Before moving to a PFC I used it for several years (through a switch so I could disable in cooler times) with no issues.

10-23-2011, 08:27 PM	#1
yzf-r1 Banned Join Date: Mar 2010 iTrader: (0) Posts: 67 Rep Power: 0	Fan Relays Anyone know which one of the four fan relays would cause the fans to stay running after the ignition is switched off? thanks

10-25-2011, 10:03 AM	#4
lt1_fd3s WNC Tour Guide Join Date: Feb 2008 Location: WNC iTrader: (3) Posts: 780 Rep Power: 17	To turn the fans on, it's a combination of at least 2 relays... I can look up the diagrams again if you need it because I can't remember the setup off the top of my head... what have you changed recently that could contribute to the new behavior? __________________ WNC Tour Guide - Including the Tail of the Dragon - PM for details

10-25-2011, 09:14 PM	#5
hades Rotary Fanatic Join Date: Mar 2008 Location: Freedom Land iTrader: (0) Posts: 316 Rep Power: 17	not to hijack. But my FD - suddenly fan were not shutting off. I had to pull the fuse to get them to stop. Now fans won't run once temp is reached. But I can turn the car off, then on and the fan come to life. I am assuming it the fan relays. I plan on just replacing all of them. YZF - rx7.com may be able to help you and order the correct relay at the same time. __________________ This is going to tear

11-12-2011, 12:20 AM	#9
rgould Rotary Non-conformist Join Date: Mar 2011 Location: Speedway (Indianapolis) iTrader: (0) Posts: 38 Rep Power: 0	There is also a recall control module added to the fd's located next to the ecu. It's a little black box that allows the fans to run if the car is turned off and the temp is at a certain range. I have had to replace said box to get this system to work again, before I removed the factory fans and relays from the car when I built a custom cooling system. Last edited by rgould; 11-12-2011 at 12:23 AM..

10-24-2011, 03:55 PM	#2
Garfinkles Motor Works RCC Contributor Join Date: Mar 2008 iTrader: (11) Posts: 535 Rep Power: 17	Do they run untill you do something to disconnect them OR do they run for about 10 minutes and shut off .The ten minute thing is built in with later models .

10-25-2011, 09:59 AM	#3
yzf-r1 Banned Join Date: Mar 2010 iTrader: (0) Posts: 67 Rep Power: 0	hey David - I haven't timed it, but they never stayed running with the ignition switch on before

10-28-2011, 12:08 AM	#8
yzf-r1 Banned Join Date: Mar 2010 iTrader: (0) Posts: 67 Rep Power: 0	Yes it does, thanks

11-12-2011, 01:57 PM	#10
yzf-r1 Banned Join Date: Mar 2010 iTrader: (0) Posts: 67 Rep Power: 0	I think I've seen this black box, what happens if you just disconnect it?

11-12-2011, 03:55 PM	#11
rgould Rotary Non-conformist Join Date: Mar 2011 Location: Speedway (Indianapolis) iTrader: (0) Posts: 38 Rep Power: 0	If you remove the box and the adapter wireing harness it will go back to the way it came from the factory . It is just an unplug and replug the harness

11-13-2011, 12:23 AM	#12
yzf-r1 Banned Join Date: Mar 2010 iTrader: (0) Posts: 67 Rep Power: 0	Fans run for 10 minutes after the ignition is off, right?

11-13-2011, 06:41 AM	#13
rgould Rotary Non-conformist Join Date: Mar 2011 Location: Speedway (Indianapolis) iTrader: (0) Posts: 38 Rep Power: 0	Something like that . I have had that system removed from my car for years and I never put a clock on it when I replaced the control box. sorry

11-13-2011, 01:51 PM	#14
yzf-r1 Banned Join Date: Mar 2010 iTrader: (0) Posts: 67 Rep Power: 0	My biggest concern is draining the battery running the fans that long...