Official Electric Fan wiring thread!

[bmk]

Simply have the power wires that went to
The stock fan fire the relays built into
The Volvo fan, then run fused power and ground to the fan relay

Since its a low and high speed do I need to order the 3 prong coolant temp sensor? (im using a e36 radiator with the volvo mounted as a pusher for clearance)

[mpowerful]

Nah id think that would be plenty. Maybe someone with a spal can chime in on that but i cant imagine it pulling more amps than that.

[E30Pacman]

ya i put a 30 amp fuse. should i be puttin a bigger one in?

[mpowerful]

Did you put a 30amp fuse in?

[E30Pacman]

man this is driving me nuts. i hit the snowflake button today to activate my orginal aux fan(deleted resistor to run on high long before spal conversion) for no reason, now i keep blowing fuse 18 everytime my spal goes to turn on. i tried moving some wires around to see if theres a short and swapping low and high speed relays, but no luck. anybody help its supposed to be hot this week??

[E30Pacman]

Not best with this wiring stuff. But All I did was follow the directions to wire it for high speed only soo.... Does it make a difference the I previously cut out the aux fan resistor an splice the two black wires together to manually control original aux fan??

[vpilarrt]

K1 should be activated when you depress the snowflake (assuming you have the middle slider at least halfway open/to the right). Are you running your wiring through K1?

[E30Pacman]

Thanks 328junkie for this. Got mine working correctly. Question though how do wire it so i can also manually turn on the fan(through snowflake button)? Sometimes the fan switch will let temp get in between half and 3/4ths before it turns fan on. Would like to be able to switch it on before then.

[328ijunkie]

Simply have the power wires that went to
The stock fan fire the relays built into
The Volvo fan, then run fused power and ground to the fan relay

[bmk]

Has anyone used the a fan from the volvo v70, 850, or 960? Ive read they flow anywhere from 3000-3500 cfm and pull 17 amps on low speed and 35 amps.

JTR suggests that I use the bmw relays to trigger the volvo 2 speed relays, does anyone have input on how this would work?

This will not be in BMW swapped car but rather an LS swapped car if that helps.

Thanks

[pandaboo911]

Got some weird problems here..
I have A/C so I wired both Low/High speed together at the fan connector. (Red + Black together, or Blue/Black + Green/Black before connector)

Using Brown/Black high speed trigger at the fan switch as per directions.

Snowflake button does not turn the fan on.
Grn/Black is grounded when I hook the fan up..
fuse 3 is also grounded when snowflake button is pressed, I think this is why fan the doesn't turn on. wtf?? Is there a short in the fan??

EDIT: Nvm I'm an idiot. AC enable switch wasnt plugged in at the panel. Works great

[328ijunkie]

Stuck 'closed' relay or switch is where i would look

[raudonis]

If none of the fan wiring was altered during the swap - the new temperature switch can be stuck "ON". It should have infinite resistance cold - no continuity for current to pass and switch the fan relay. Might be stuck fan relay. Relay pins 30 and 87 should have no continuity.

[wakdog]

I had done this setup and had it running perfectly when I had an M50 in the car 12 months ago, since then I have put in an S50 and new radiator and temp switch. The problem is that now the fan is on as soon as you turn the key and is ignoring the temp switch...

Still need to test the relays, but what parts of the setup in like in the original post would cause my fan to run constantly?

[MyE30]

You said you where starting from zero. Why would it matter were k1 and pin 86 go? If on the relay 86 is wired for power, wire 85 to ground. If 86 is ground make sure 85 has power that is controlled by whatever you want to control it.

I believe you are over complicating things.