flex-a-lite dual fans problems

[srdet811]

i just installed my flex-a-lite dual fans with the DIF dual fan controller.
At first it was working fine but now when i shut off my car my fans wont shut off......

Need Help

[sr20boostn20]

do they eventually shut off?

i do believe that they are suppose to stay on untill the car reaches the proper temperature.

i know mine stay on but they do go off.

[HalveBlue]

I believe the DiF fan controller keeps the fans running for about 2 minutes after shut off.

[koukimonster139]

same as what i got




if its thermo controlled should turn off at set temp. no matter if the car is on/off or whatever

it stays on depending temp. is what im saying

have you got an aftermarket temp guage?


maybe your shit runs hot cause we all know stock temp guage is bs

[g6civcx]

Use an ignition switch triggered relay to send power to the fans instead of pulling power for the fans directly from the battery.

[bruinbear714]

Originally Posted by srdet811

i just installed my flex-a-lite dual fans with the DIF dual fan controller.
At first it was working fine but now when i shut off my car my fans wont shut off......

Need Help

The DIF unit keeps your fans on up to 2 mins after you shut off your engine. If it stays on for more than 2 mins, you might have a wiring issue on the engine harness side with the coolant sensor.

There should be no power (ie, 0V) on the sensor or on any wire of the engine harness with the key out.

[g6civcx]

Originally Posted by bruinbear714

There should be no power (ie, 0V) on the sensor or on any wire of the engine harness with the key out.

Not necessarily true. It depends on how you wire the power source for the fan controller. If you pull power straight from the battery, the controller will activate the fan(s) regardless of the ignition switch power.

Then if you pull power for the fans directly from the battery, which 99.9% of people here do, then the fans will come on regardless of ignition switch power.

[bruinbear714]

Originally Posted by g6civcx

Not necessarily true. It depends on how you wire the power source for the fan controller. If you pull power straight from the battery, the controller will activate the fan(s) regardless of the ignition switch power.

Then if you pull power for the fans directly from the battery, which 99.9% of people here do, then the fans will come on regardless of ignition switch power.

I might have not been clear in my previous post... so here I go again.

Now I'm talking specifically about the fan controller. Generally speaking, with the key out of the ignition, there should be no power at all going to any devices on the engine harness.

No power to fuel injectors, knock sensor, crank angle sensor, maf, coolant temp, oxygen, etc.

This is how the manufacturer designed the wiring. As soon as you put the key on the "ON" position, it activates a relay to the ecu and powers all the engine sensors and electronics.

If anyone has power on any OEM sensor with the key out, there is a wiring problem, most likely due to ecu still being powered with the key out.

Chances are wiring is modified if the chassis has been through an engine swap.

[Howard92884]

Originally Posted by bruinbear714

I might have not been clear in my previous post... so here I go again.

Now I'm talking specifically about the fan controller. Generally speaking, with the key out of the ignition, there should be no power at all going to any devices on the engine harness.

No power to fuel injectors, knock sensor, crank angle sensor, maf, coolant temp, oxygen, etc.

This is how the manufacturer designed the wiring. As soon as you put the key on the "ON" position, it activates a relay to the ecu and powers all the engine sensors and electronics.

If anyone has power on any OEM sensor with the key out, there is a wiring problem, most likely due to ecu still being powered with the key out.

Chances are wiring is modified if the chassis has been through an engine swap.

Things are still powered when you turn your key off especially in newer cars. Whenever I work on electric fans I always disconnect the battery beforehand. Alot of cars that come factory with electric fans stay running after you turn the car off to keep the temp down.

[spoolandslide]

your fan will stay on to keep cooling your engine if its too hot

do the fans turn on/off......

-when they key turns the ignition
-when the engine becomes too hot/cool
-or do they stay on as long as the wires are connected to the battery
-or did you forget to hook it up into the thermostat?

[g6civcx]

Originally Posted by bruinbear714

Now I'm talking specifically about the fan controller. Generally speaking, with the key out of the ignition, there should be no power at all going to any devices on the engine harness.

No power to fuel injectors, knock sensor, crank angle sensor, maf, coolant temp, oxygen, etc.

This is how the manufacturer designed the wiring. As soon as you put the key on the "ON" position, it activates a relay to the ecu and powers all the engine sensors and electronics.

If anyone has power on any OEM sensor with the key out, there is a wiring problem, most likely due to ecu still being powered with the key out.

Chances are wiring is modified if the chassis has been through an engine swap.

First, I thought we were talking about the DiF fan controllers.

Second, some manufacturers warn that electric fans may come on any time. The recommendation is to disconnect the negative battery terminal when working near the radiator area.

Third, I didn't know that Nissan uses thermo switch in their clutch fans.

I don't disagree with you completely. It's just that your statement is only correct for certain cars, but not every car.

[pwr-adr]

what is the point of the fan controller anyways? I have mine set to the ingition so the car is on, then the fans are on, the car is off, so are the fans.

I don't undestand why you would want to keep the fans going for 2 minutes or more after you have turned it off, your not circulating coolant so you are just pushin/pullin air through the radiator and cooling only what is inside of the radiator.. not worth it to me.

[240gtsX]

Im not sure if you guys have had this problem before but the wires my DIF came with keep burning. I have re-checked the wiring and everything is connected fine. This past tuesday on my way to work i noticed my fans were not on (loud fans). I took the car back home and then checked the wiring and the same wire (power to fuse to DIF) either keeps on getting too hot and burning up or keeps on short circuiting. I am now trying to fix this problem by replacing the same wire and now my fans wont turn on. Any and all help would be appreciated with this matter. It kept on raining today so I could continue with my search on what is wrong with my DIF and/or fan wiring.

[rocksteady_racer]

I'm guessing their getting overloaded (maybe the alternator is putting out too much power - I had that problem because Pepboys replaced it 3 times with one that was the wrong one for the motor but that's what their catalog said so they researched it and it turned out it was the wrong alternator for the ka) from whatever power source your getting it from. Check it with a multimeter or try powering it up directly from the battery. My guess is that it blew out from too powerful of a charge. If it doesn't work, it's probably fried now. I'd use a resistor or fuse in the future to prevent this from happening.