240canuck wrote:ok I got a question I got a 92 auto 240sx with no AC so i got no elctric fan all mechanical. would the easiest way to hook up an electric fan be to just wire it to a 12 volt source that turns on when your ignition is on? and leave it at that maybe 2 12" fans. will that be adequate? also how far from the rad should the fans be and do i need to use a the fan shroud also??
I would wire in one of those 4 wire relays, the blue ones from a nissan in. Run a lead from the battery to a 30 amp fuseable, then to the power in to the relay. Run the power out to the fan. Tap one of the triggers in to the primary ignition circuit, and ground the other out. This will allow the fan to come on with ign on.
You could do both this way or, better wire in a thermostat for the second fan, so that the power usage is halved unless needed.
Now:
Black240 wrote:now my question is.. would what this guy told me to do be right?
he told me that one fan will turn on at one point and then the other i think one around 80 deg and the other at like 1something...
Heres the deal there are two relays both tied to the ign primary and run off a single 30amp fusable. The stock fan is a 4 wire dual speed fan as well. When the car hits 95c - 203f the ecu signals the low speed relay on, and keeps it on till 100c - 212f, as well as anytime the ac is on below 100c - 212f.
When the car hits 100c the ecu trips out the second relay to come on turning the fan speed to high, it also comes on high anytime the triple pressure switch is on, with ac on.
Quote »I want to know if this is true or should I get a thermostat kit and wire the fans to that!? [/quote]It should work that way especially if both new fans are single speed fans. The only thing I dont really know is if the ecu kicks the low side off when the high side is activated. From trial and error, and IIRC in my dealings with it, it leaves both sides open reducing resistance in the motor of the fan allowing the increase in speed...
You could get a new plug from a JY, tie that in with simple butt crimp connectors to the new fans, and double check. If all is good solder the connections for a 100% connection and be done with it.
Another alternative is run a new relay like previously stated to the fan closest to the headder, and tie the neg to the oem harness. This has one fan spinning constantly when the ign switch is thrown. Then simply wire both pos and both neg together from the oem harness and tap that into one fan. It will spin only when getting too hot or with ac (as the second will be spinning constantly) and I feel this is the best way.
I can post wire colors and the likes on specific relay setup if you wish...
edit: btw I run dual speed altima fans in my car. One is directly plugged into the OEM cooling harnes with the other borrowing a ground, and then power is run from a new constant on relay, I ran (I had room for new relays in the box and it looks oem). The thing is I have the second (constant) fan wired to the high speed wiring into the motor yet it spins at low speed (still very very decent cfm's). This is why I say the ecu leaves both hot allowing more current to be drawn thus higher speed is achieved.