push or pull? Radiator E-fan

[rps13saipan]

i searched and didnt find anything concerning my question.

i have replaced my radiator electric fan to a dual twin electric racing fan.dont know what kind it is but it was free,friend gave it to me before thrashing his 240.

my question is DOES THE ELECTRIC FAN SUPPOSE TO SUCK OR BLOW AIR?

my crackerjack 91 240sx ka24de was a piece of junk when i first bought it about 3 years ago.and now its overheating...my OEM connectors for the E-fan has been cut out.so im trying wire it myself, but dont know anything about the polarities. i have tried connecting it and have the fan blow out the air from the engine bay through the radiator and tried vise-versa suck air through the radiator to the engine bay but cant figure out whats the real solution to cooling the radiator in terms of radiator electric fans.

please help...i'd appreciate it
Modified by rps13saipan at 9:44 PM 12/20/2009

[Jesse SR20]

It depends on which side of the rad. the fan is mounted.

Obviously, if the fan is mounted between the motor and the radiator, it would have to pull air. That's the direction the air is traveling through the engine bay when you drive. You don't want your fan to fight against wind.

Some fans require you to flip the blade around inside the shroud, as well as reverse the polarity, so read the installation manual.

[bersh240]

air into engine bay.

[rps13saipan]

jesse SR20 my dual radiator is mounted in between the radiator and the engine.

one more question is it a dumb move to have both the clutch fan and a dual electric radiator?

cool! THANKS guys for the help....it kinda makes more sense to me now......

[Jesse SR20]

It's complete overkill to keep the clutch fan and have an e-fan. Either keep the clutch fan and the stock shrouding, or ditch it and go electric.

[bersh240]

whoaa both fans??e-fans are alot less of a pain. more room. just put the efans on a switch and turn em on while sittin in traffic or when ur beatin the car to death. no fan controllers breaking. no things stuck in fan. no belts flying off. no fear of getting ur hand chopped off...

[rps13saipan]

whoaa both fans??e-fans are alot less of a pain. more room. just put the efans on a switch and turn em on while sittin in traffic or when ur beatin the car to death. no fan controllers breaking. no things stuck in fan. no belts flying off. no fear of getting ur hand chopped off...

hahaha! true.sounds s2pid for me to say this but before i got the dual e-fans ive been using the clutch fan WITHOUT the fan shroud....and now my 240 is runnning on both E-fans and Clutch fan( with out shroud). will it sort of mess-up my cooling system or electrical system or something...

anyways...THANKS GUYS FOR THE HELP im getting rid of the clutch fan 2nyt.

[spolitte]

Bought a car with dual FaL in it a while ago, in front of radiator as there was no room between radiator and motor for it (I would prefer it to be there pulling air through the radiator if it were possible). Drove it many many miles (a few hundred with no problem), then a few miles from home white smoke starts gushing from the car and the good ol' smell of stanky tuna rising up through the air.... oh yeh, I should mention that the water temp gage wasn't working properly because the ground was loose and I didn't have the tools to fix it till I got home... luckily nothing on the motor was damaged and all that happened was a coolent hose popped off because of the heat and pressure. My buddy was driving behind me so we hooked up the car with a tow strap and he tows me the remaining few miles home. Once at home we start looking around and plug the coolent lines back in, hook up a ground to the water temp sensor, and start the car to see at what temp it runs. The thing got up to about 210-215 before I shut it off to check the radiator lines again etc etc. At this time we realize that the dual FaL installed in front of the radiator was hooked up in reverse polarity by the kid who installed the thing (it was actually fighting the wind flow over the radiator while driving)... Simply had to switch the + and - at the thermostat control box it was hooked up to via the male/female connectors. The fans start blowing the correct way, and problem solved (except the car still runs a little warm, about 200-210ish) but doesn't go over 210 unless pushed.

Good anecdote right? Lol, now that I've bored you to death, OP, to answer your question, No running more fans will not mess up your cooling or electrical system (assuming they are wired correctly and not hitting anything when they are spinning) just a bit overkill. Keep in mind tho, that an ideal engine operating temperature is about 195 degrees farenheit so if these 3 fans are doing too good of a job then your engine won't run as efficiently as it possibly could and, depending on the cars computer, can actually make the car run poorly if it is running too cold (i.e. the computer can think that the car hasn't warmed up yet, and won't run the proper fuel corrections, changes spark timing, etc etc.). As for running a clutch fan with no shroud, the shrouds purpose is really two fold. One, it directs air from the fan in an intended direction as opposed to letting the air it blows move freely, and two, it's a semi-safety feature to prevent you from choppin off your digits.

As for your other question of suck or blow, always have the fans pulling air from the front of the car and pushing it towards the back end. And finally, although not a huge deal, as I mentioned above I would prefer the fans to be between the radiator and engine if possible for a few reasons. One, if its in front of the radiator then it is just one more thing to diffuse cool air before it reaches your radiator, and two, it creates a nice little buffer zone between your always hot engine block and the radiator. However, this is not always possible and is really not a big deal if thats the case. Either way the fans will be moving cool air across the cooling fins on the radiator.

Sorry if any of this seems a little loopey, its a bit late and I'm a bit tired. If any of it doesn't make sense let me know and I will try to explain it better.