Fan overide.

mack

NAXJA Forum User

Location

gone fishin....

• May 8, 2006

• #1

does anyone have a good write up on a fan overide switch? for a 92, i don't have any overheating at all, i just want control over the fan, i want to turn it on with a switch, but when the switch is off, i want it work like normal, some say you need a relay, some say you don't,so after about 12 pages of looking around, i think this will be quicker.
thanks.

 

T

tealcherokee

NAXJA Forum User

Location

CT

• May 8, 2006

• #2

use the stock relay, and a 3 pole switch, one side 12v to relay, other side ecu wire to relay

- 12v
- to relay
- ecu

 

mack

NAXJA Forum User

Location

gone fishin....

• May 8, 2006

• #3

i'm a fool when it comes to wires, is the stock relay on the driver side next to the rad?

tealcherokee said:

use the stock relay, and a 3 pole switch, one side 12v to relay, other side ecu wire to relay

- 12v
- to relay
- ecu

Click to expand...

 

C

cassio

NAXJA Forum User

Location

san antonio, TX

• May 8, 2006

• #4

mack said:

i'm a fool when it comes to wires, is the stock relay on the driver side next to the rad?

Click to expand...

yes it is

 

T

tealcherokee

NAXJA Forum User

Location

CT

• May 8, 2006

• #5

sorry it saved like crap

 

mack

NAXJA Forum User

Location

gone fishin....

• May 23, 2006

• #6

does anyone use the Xj-Armor harness for this?

 

A

ALL PLAY

NAXJA Forum User

Location

Grants, New Mexico

• May 23, 2006

• #7

I did and it works off the switch. They advertise that it will work if I have off but not......

For the money try to wire it your self.

Bo

 

mack

NAXJA Forum User

Location

gone fishin....

• May 23, 2006

• #8

so the fan doesn't come on if the switch is off? what year xj do you have?

ALL PLAY said:

I did and it works off the switch. They advertise that it will work if I have off but not......

For the money try to wire it your self.

Bo

Click to expand...

 

A

ALL PLAY

NAXJA Forum User

Location

Grants, New Mexico

• May 23, 2006

• #9

92!! I wired it as the insructions said but nothing happens when my temp goes over 210-220. Now I just have it on all the time.

The reason I bought it was so when the wife drove the jeep I would'nt have to worry about it.

Maybe I should just tell her to use her jeep ( a thought)..

Bo

 

Starboard M

NAXJA Member

NAXJA Member

Location

Lafayette, CA

• May 23, 2006

• #10

I have the xj armor one for my 89. It will start the fan if I have the ac/defroster on, as well as when the switch is on.
I wish I had tried to do it myself, because it is more or less a relay, switch, and a few conectors. Try to do it yourself, and if it doesnt work, go for the xjarmor.

 

K

korda

NAXJA Forum User

Location

San Diego, CA

• May 23, 2006

• #11

mack said:

does anyone use the Xj-Armor harness for this?

Click to expand...

I did. Very pleased with the quality of it too. Sure, it's just wires and a relay but it's nicer than what I would have done myself.

Mine works just as advertised. The fan works normally but if I want it on at a time it's not typically on then I just flip the switch.

 

mack

NAXJA Forum User

Location

gone fishin....

• May 23, 2006

• #12

does he still sell these? i can't seem to find the site.

 

T

tealcherokee

NAXJA Forum User

Location

CT

• May 23, 2006

• #13

the pic i posted will allow the ecu to power it when it wants to when its off, and the batt power it when its on

 

mack

NAXJA Forum User

Location

gone fishin....

• May 23, 2006

• #14

someone said if i don't use a diode, it will fry the ecu.

 

A

ALL PLAY

NAXJA Forum User

Location

Grants, New Mexico

• May 23, 2006

• #15

XJ-armor.com Override switch..

 

J

jeeptorino68

NAXJA Forum User

Location

Lebanon OR

• May 24, 2006

• #16

so is this a 3 position switch or just a two positon with 3 poles?
thanks

 

joecool

NAXJA Forum User

Location

Akron, Ohio

• May 27, 2006

• #17

mack said:

does he still sell these? i can't seem to find the site.

Click to expand...

He used to sell them on eBay, but when I just checked there was nothing. When I looked him up, it says that he is no longer a registered user. So I'm wondering if he is getting out of the business.

 

T

tealcherokee

NAXJA Forum User

Location

CT

• May 27, 2006

• #18

2 pos. 3 poles

 

B

BillyBob

NAXJA Forum User

Location

NJ

• May 28, 2006

• #19

Another option would to install a "Summer/Winter" switch powered off the switched side of the brake light switch using an additional relay to power the fan when standing in traffic. The biggest drawback is that the fan will be energized any time you brake, unless you have the switch in the "Winter" position......

 

S

Shogun

NAXJA Forum User

Location

Arizona Territory

• May 28, 2006

• #20

Another method;

The Fan Control Relay is switched by the temp sensor and/or the A/C. All you need to do is add a third input method of activating the relay. Thus you dont need to cut any existing wires from the ECU. Also, there already exist the required diodes if you choose to input before them.

In english, a standard SPST switch (2 wires) which supplies 12v to pin #2 of the Fan Control Relay will turn on the fan and preserve the other two methods of switching. Up to you whether you want to pull the 12v from a switched line or hot line as to if you want your Override-on position to run with the vehicle shut off or not (the temp switch runs from hot battery so you really dont need it and would avoid a dead battery). This setup provides Normal Auto fan and Manual Override on. Remember, its just the relay you are switching, no need for heavy guage power and fuses since the fan uses the oem wiring.

Now, if the temp switch operates at 190 and the thermostat is 190-195, why would you need to manual on the fan? (hint-temp switch failure) A very limited circumstance.