Hi everyone,

I've recently removed the mechanical fan from my car and installed an electric fan from an '89 GTA, and I currently have it wired up to turn on when I flick a switch.

It certainly blows a lot of air but I personally find it kinda noisy.

Does anyone think it would be a good idea to have dual fans going (I have a second fan), but have them running at half their maximum speed? Theoretically, this would produce the same air flow as one fan, but does anyone think that running two fans at half speed would be quieter than one fan running at full speed?

 

well my fans are hardly on at in, summer or winter.

if i get stuck in traffic during the summer and a few minutes pass bye and the engine temp gets alittle over 220 i turn on my passengers side and it keep the engine that temp / helps it go down alittle untill i get moving on the highway again.

i rather have one fan and have the ability to have it full power when i need it. a dual fan setup wouldnt be a bad idea but i will still want each to be full speed.

 

You could rig up some kind of dimmer type switch to adjust the power going to them, then you can keep them quite when you want it, and have them full power when you need cooling. Maybe something like the adjustable interior light (cluster) that works by turning the headlight ****. You could hook up another headlight know (scratch the headlight symbol off) and use that to adjust your fan. Not sure if you can get it work, but sounds like a neat idea to me.

Anyone wanna buy some pot?

 

Mmmmm, I like that idea. A pontentiometer should do the trick.

 

Fourthgens have dual fans, with an extra relay to switch them from series to parallel. In other words, both fans activate together, but in either a low-speed or high-speed mode.

When I switched my '83 T/A from manual to electric fans, I wired it up with an extra relay and switch, so I could do the same thing. It worked quite well, actually. When the fans were running in series, they were extremely quiet.

I later changed the car over to EFI, and in the course of that project, the custom fan control setup was replaced by a stock TPI wiring harness, so at present the car has "normal" dual fans.
I may eventually add the extra stuff onto the TPI wiring harness to have the dual-speed option again.

 

I hope you're kidding.
The way I see it, the only way of slowing down a cooling fan that takes over 10amps is to pulse width modulate it. Have fun trying a pot, just don't hold it in your hand and it wouldn't be a bad idea to have a fire extinguisher near.

 

What would I need to do PWM?

 

I honestly don't know what you would need but it wouldn't be cheap. I think you should look into a vehicle speed switch so at 35+mph the fans turn off. If your air dam is still good you shouldn't have any issues with overheating.

 

My car has never had an air damn since I've had it, and where I live, the car has never gone over 160 degrees. I've also removed the air conditioning and have an after market nose which allows more air to get to the radiator.

From experimenting in the last few days and seeing just how fast a single electrical fan can cool things down when turned on manually, I think I might just stick with the one fan.

 

You would need a wirewound variable resistor capable of al least 100 watts, they make them but they are BIG and generate at lot of heat, just look at the size of the heater blower motor resistor wire. The real way to do it would be with an electronic control system. Probably a couple of 100 watt power transistors with a simple varaible drive circuit. You will still need a large heat sink to dissipate the heat from the transistors. Either way unless you are savvy with electronics it may be more of a PITA than it's worth.

 

yeah u could mount the control box in the engine bay and have the remote **** in the inside