Hey guys, So the guy who used to own my car wired the electric fan into the ac compressor power wires, I'm in the process of getting the ac back in the car, but now my question is: where is the best place to wire iginition on for the electric fan? I feel like i've been poking and prodding under the hood at wires with my test light and cant find something suitable. Thanks for the help

 

How about, just put it back like it came from the factory. Find all the wires, un-hack them, and put it back like it belongs.

One good hack job DOES NOT deserve another.

 

Couldnt agree more, but i dont believe this was a factory electric fan car, where would i look for the fan wires?

 

Should be a fan relay by the brake booster. Fan switch would have been in the pass side head, wire would have been dark green. High-power wiring from the relay to the fan motor should be along the core support somewhere.

If it wasn't an original electric fan car, first thing you need is a relay. There's NO WAY the car will survive for long if you try to run the fan current through the ign sw. Either the sw or the wiring, or both, will be destroyed; or, the car will seriously overheat from the fan unexpectedly not working and it'll take itself to its graveyard that way.

 

Ok i'll check around the drivers side firewall for an empty set of wires, and yes I was planning on using a relay, dont want to kill the car in a stupid way just yet. Thanks for the help guys.

 

Your 86 should have a power "junction block" hiding behind the drivers kick panel. One side is made for Pink wires ( switched power) and the other side is made for Orange wires (Hot). There are also a couple of empty slots in the fusebox. IMO these are the best places to tap into power - either switched by the ignition or hot at all times.

I just had to add an aftermarket fan switch because my 86 harness was from a TPI car. (TPI fan controlled by ECM). The car was converted to carb and I used a stock fan with a Hayden fan switch. ( you can see where I mounted it in this pic.



Because my harness didn't have a choke wire or fan wiring - I tapped into the junction box to power those circuits. ( the fan also got a fuse placed between the relay & fan. ) Here's what the junction block looks like:



The wires shown are the wires that connect the junction block to the fusebox..... all the other slots for plugs are for optional equipment. (You might also need to add a Circuit breaker to your fusebox if it's not already installed. ) You can snip a few junction block wiring connectors from just about any Thirdgen from 82-87 in your local boneyard.

The fan switch I used was adjustable and kicks the fans on around 190. The thermostat is a 160. There's also a "A/C input wire that I tapped into the heater-A/C control head for a manual fan swtich operation It acts just like the factory; turn the control head to any AC setting and the fan kicks on. It works great with a mild street motor - but if your making serious HP than I'd recommend a block mounted temp sensor for the fan relay.

 

get a relay and wire it directly to the battery.. find a wire under the hood that is hot with the key on and wire the trigger wire on the relay so it has power at all times with the key on.. run the relay ground wire to a temp switch mounted in the intake manifold to turn the fan on when the engine reaches whatever temp you think is hot- i have a 220 on/215 off switch in my car because i like it to run nice and hot for fuel economy and so the fan isn't on while i'm driving down the road, but you can also get switches that turn on at 180 if you think that's a good idea..