Official Electric Fan wiring thread!

[NigelStu]

LOL, faulty brand new temp switch - talk about chasing your tail.

Thanks Dave and Erik for your help!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Hum... I might have the same issue. Got the aux fan installed and wired in over the weekend, but it doesn't turn on.

Running the same 3-pole 80/88 switch as Giant.


If I unplug the switch and jumper the plug, both low speed and high speed fan speeds work. But nothing when plugged in. Let the car warm up so that needle was close to the tic-mark half-way between normal and the red zone.


Whats the best / proper way to test that switch so I can make sure it is actaully bad (although, I can't imagine it isn't)? Is there any other reason why it might not be working? Radiator has been bled properly, so I don't think there would be any air trapped near the sensor, thus giving false signal...



Also, with the temp switch plugged in, pressing the A/C(snowflake) button does NOT turn on the aux fan. Any ideas on that one?

[328ijunkie]

well after about 3 min of sitting still in the summer even if your not in traffic the temp will start to climb. If you DD the car at all you have to have a fan.

[trackjunkie21]

you never actually need a fan, unless your sitting in traffic, at 55mph you are pulling in a lot of air.

[lolcantturn]

And who knows, it might actually be relatively cold that day and I might not need to use the fan at all.

[lolcantturn]

Wiring a load as large as a fan directly to a switch often ends in a massive fail. The better idea is to leave the unfinished car in the garage and ride with a friend. Come back from the trip and fix it correctly.

JMHO

Would you recommend doing honestly? None of my friends have cars (Im still in high school..figures). I'm honestly only going to turn the switch on when I absolutely HAVE to, and will turn it off immediately. The switch is rated for 35Amps at 12VDC, the fan only pulls 11amps, and there's a 30amp fuse in line between them. I should be fine for a day, no? Regardless I've already order the temp switch so I can do it right.

[bimmerteck]

Lol I'm a noob. Got an old switch and put it in as a blank on my dash, wired up the fan to it with a 30amp fuse in line. It feels terrible and looks terrible but it's all I need for this trip cause this road is all traffic. ordered a new temp switch for when I come back.

Wiring a load as large as a fan directly to a switch often ends in a massive fail. The better idea is to leave the unfinished car in the garage and ride with a friend. Come back from the trip and fix it correctly.

JMHO

[lolcantturn]

Lol I'm a noob. Got an old switch and put it in as a blank on my dash, wired up the fan to it with a 30amp fuse in line. It feels terrible and looks terrible but it's all I need for this trip cause this road is all traffic. ordered a new temp switch for when I come back.

[lolcantturn]

Oh god, I really need this fan running tonight, i won't be able to get a temp switch anytime soon.

[bimmerteck]

LOL, faulty brand new temp switch - talk about chasing your tail.

Thanks Dave and Erik for your help!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

That temp switch is also new

I need this fan to work today, I'm going on a road trip with friends and this heat is going to devour my car. Just need it to work some way or some how

New doesn't mean the same thing as good. Test it replace it if faulty. Then find somone to help clean up that wiring mess. ;)


Erik

[lolcantturn]

That temp switch is also new

I need this fan to work today, I'm going on a road trip with friends and this heat is going to devour my car. Just need it to work some way or some how

[lolcantturn]

Wired it up as per OP's instructions, still nothing. I got to get this fan working cause my coolant cap keeps bursting over, it's 98* outside and my E30 will have none of it. Need this working asap





I know it's a wiring hack job, but it's just
Temporary until it actually works..

[328ijunkie]

Good to hear!

[bimmerteck]

LOL, faulty brand new temp switch - talk about chasing your tail.

Thanks Dave and Erik for your help!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

No problem, glad we got it sorted.



Erik

[giantkeeper]

LOL, faulty brand new temp switch - talk about chasing your tail.

Thanks Dave and Erik for your help!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

[lolcantturn]

BK/Blue is high speed +12 and brn is ground yes.

And as for the temp switch, yes assuming you have a fan switch between them.

Whatchu mean fan switch? The thing on the radiator right?
Sorry for being so lost. I can wire an M50 but I can't figure this out, go figure haha.