SPAL efan issues

[x Spades x]

Hey Fellas,

I'm making another post as I've been struggling with this setup. I purchased the below and set up about a month ago. I'm not sure how to get the temps right, as it's on full blast and the engine has a hard time getting to temp (and oil). When I turn the car off, the fan remains on until I unplug it (it will kill the battery if left alone). I retained the AUX fan and now that is on all of the time as well.

Can anyone send instructions on how to set this up properly? Also, do they all sound like jet engines? :-(

Thanks in advance!
Kareem

[sapote]

I retained the AUX fan and now that is on all of the time as well.

How do you have two fans wire to the stock single connector (12v, GND, and pwm control signal)?

[x Spades x]

How do you have two fans wire to the stock single connector (12v, GND, and pwm control signal)?

They arent the same power source. I'm only using the aux fan for the temp.

Is the an example of how I should be wiring this and what the correct power source should be?

Link where it's explained, or official instructions, etc? I'm just at a loss

[bigjae46]

Make your life easy and buy two SPDT relays and one of these...

GlowShift | 38mm (1-1/2”) Water Sender Hose Attachment

Then screw in a 1/8" NPT temp switch I think 180-ish? Whatever temp the t-stat opens. Splice it into your lower radiator hose. Then wire a SPDT relay to the fan.

SOMEONE DOUBLE CHECK ME ON THIS...its been awhile

Relay 1
30 - fused to battery
87 - Fan +12v
85 - IGN
86 - GND

Fan +12 - to relay 1 (87)
Fan GND - to relay 2 (87)

Temp switch - to relay 2 (85)
Ground temp switch to chassis

Relay 2
87 - Fan ground
30 - chassis ground
85 - temp switch
86 - fused to battery


That is a ground triggered fan circuit. When the t-stat opens it will heat up the coolant in the lower rad hose. The temp switch will close the circuit to ground, activate the relay coil and complete the fan's path to ground and turn on the fan. If its backwards (fan is on when the car is off) then use relay contact 87A for the fan ground.

Then if the t-stat closes, the temp switch opens the circuit and the fan turns off.
If you shut the ignition off, it opens the fan circuit so the fan can't turn on.

If you want, you can delete relay 1, wire the fan with a fuse to the battery. If you shut the car off and the coolant is still hot, the fan will stay on and continue to cool the coolant. I'd maybe do that for a track car, not a DD.

[x Spades x]

Make your life easy and buy two SPDT relays and one of these...

GlowShift | 38mm (1-1/2”) Water Sender Hose Attachment

Then screw in a 1/8" NPT temp switch I think 180-ish? Whatever temp the t-stat opens. Splice it into your lower radiator hose. Then wire a SPDT relay to the fan.

SOMEONE DOUBLE CHECK ME ON THIS...its been awhile

Relay 1
30 - fused to battery
87 - Fan +12v
85 - IGN
86 - GND

Fan +12 - to relay 1 (87)
Fan GND - to relay 2 (87)

Temp switch - to relay 2 (85)
Ground temp switch to chassis

Relay 2
87 - Fan ground
30 - chassis ground
85 - temp switch
86 - fused to battery


That is a ground triggered fan circuit. When the t-stat opens it will heat up the coolant in the lower rad hose. The temp switch will close the circuit to ground, activate the relay coil and complete the fan's path to ground and turn on the fan. If its backwards (fan is on when the car is off) then use relay contact 87A for the fan ground.

Then if the t-stat closes, the temp switch opens the circuit and the fan turns off.
If you shut the ignition off, it opens the fan circuit so the fan can't turn on.

If you want, you can delete relay 1, wire the fan with a fuse to the battery. If you shut the car off and the coolant is still hot, the fan will stay on and continue to cool the coolant. I'd maybe do that for a track car, not a DD.

Thanks so much Bud!

[WOLFN8TR]

Great info. 👍

[bigjae46]

Thanks so much Bud!

No problem... but definitely double check me.

Short version is you need one relay to provide adequate amperage that is switched on/off with the ignition. You need a second one to control the fan using the temp switch.

SPDT relay
85/86 is the coil when energized completes the circuit between 30 & 87.
85/86 is the coil when de-energized completes the circuit between 30 & 87A.