Cooling HELP!!

[Funktown240]

Right now I am running a CXRacing 2 core radiator and dual 12" puller fans. I have ducted under the IC to the core support and I also have a diversion panel on top of the support. The fans are running all the time(have it tapped into the fuel fuse) but im still running hot even with the defrost on full blast!! Would mounting the E fans on the condensor support and pushing make any difference? Im all out of ideas, PLEASE HELP A BROTHA OUT!

[240z4u]

Sounds like you have air in the system still. Or a bad thermostat.

I have a mishimoto radiator (same chinese crap) and a single 12" puller and don't overheat. You have something awry for sure.

You sure you have those fans wired in right? And how do you know what your coolant temps are? Are you using the rb coolant temp sensor with your stock gauge? Because that will make it appear as if your overheating.

[Darius]

These are dumb questions, but here goes:

Are your fans pullers or pushers or "interchangeable" by reversing the wiring?

Are you running the fans off of a relay or directly from fuel pump fuse power?

What brand name are the fans?

[RustspecS13]

I have the cxracing radiator and I have 2 13in pusher fans and I have no problems with cooling what so ever.

What temp gauge do you have? If you just have the stock one you need the 240sx single wire temperature sender. Id highly recommend a aftermarket gauge they are far more accurate.

GET THE FANS OFF THAT FUEL PUMP FUSE! That's dropping the voltage to your fuel pump and will cause all kinds of problems, and running lean will blow your motor.

Your 12in pullers should be fine, as long as they are getting good power, and your cooling system is properly bled.

~Alex

[Funktown240]

These are dumb questions, but here goes:

Are your fans pullers or pushers or "interchangeable" by reversing the wiring?

Are you running the fans off of a relay or directly from fuel pump fuse power?

What brand name are the fans?

Ok i changed the wiring on the fans to another source besides the fuel pump. The fans are reversable, i dunno what brand they are(s style blades). . . . .i bought a combo rad+fans from CXRacing. I might need to bleed it again, also the thermstat is brand new from a 300ZX. I am using the stock temp gauge as a reference(i know, i know-i should have an aftermarket gauge to monitor temps. . . . .but im a cheap azz LOL). I know for sure that its getting too hot cause the ECU is going into limp mode, dumping fuel and pulling timing.

[Darius]

Ok sounds good so far. Now for round 2 of questions

Are you running a 50/50 mix of coolant and water?

Are you sure the fans are wired properly and that they are pulling air through the radiator as opposed to trying to push it back out the front of the car when it is moving?

Are the fan shrouds sealed against the radiator fins or is there a gap? Any gap will allow air to sneak in through the sides as opposed to going through the radiator. (i.e. path of least resistance)

Do you know the condition of the water pump? Have you taken it off to see if the blades are in tact?

[Funktown240]

Ok sounds good so far. Now for round 2 of questions

Are you running a 50/50 mix of coolant and water?

Are you sure the fans are wired properly and that they are pulling air through the radiator as opposed to trying to push it back out the front of the car when it is moving?

Are the fan shrouds sealed against the radiator fins or is there a gap? Any gap will allow air to sneak in through the sides as opposed to going through the radiator. (i.e. path of least resistance)

Do you know the condition of the water pump? Have you taken it off to see if the blades are in tact?

I am using a mixture of about 65/35 water and coolant plus water wetter. Im pretty sure that the fans are wired correctly cause the first time i wired them up i wasnt getting any airflow behind the fans till i switched the leads. I originally bought the radiator with the fans and an aluminum shround but I didnt end up using the shroud cause it wouldnt fit(the fans were fitting the pullies). I have no idea what kind of condition that the water pump is in, do you think that its bad?

[RustspecS13]

How do you know its running hot?

~Alex

[Funktown240]

How do you know its running hot?

~Alex

ECU is going into limp mode, dumping fuel and pulling timing

[RustspecS13]

Id pull codes first, limp mode doesn't mean running hot is the cause. But bad tuning (aka limp mode maps) can cause you to run hot too.

~Alex

[Funktown240]

Id pull codes first, limp mode doesn't mean running hot is the cause. But bad tuning (aka limp mode maps) can cause you to run hot too.

~Alex

The cars runs great when its cold and at temperature. It only overheats whenever im on the highway. . . . .it creeps up slow until it gets hot. Then the backfiring, bad gas mileage, and breaking up in boost begins. Is there any way that I can check if the water pump is working as it should without taking it off?

[s14_sport]

The cars runs great when its cold and at temperature. It only overheats whenever im on the highway. . . . .it creeps up slow until it gets hot. Then the backfiring, bad gas mileage, and breaking up in boost begins. Is there any way that I can check if the water pump is working as it should without taking it off?

make sure you FULLY bleed that thing...it took a good 30-45mins of bleeding coolant for all the air bubbles to come out of my motor.

[Funktown240]

Do you jack up the front of the car and blast the heater?

[s14_sport]

Yea.....with the car cold, I took the rad cap off, jacked car up and started her up. blasted the heater, grabbed a drink and watched until all the bubbles came out. Topping off with coolant everytime I saw the coolant level go down.

[Funktown240]

Ok ill give it another shot, is there any bleeder screw on the cooling system to make it a lil easier?

[boosted98gst]

Just an idea, when I bought my 240 it had the same cx radiator and 2 12"fan's and was having issues with running warm. The cheap china fans could not keep up, I bet you anything yours are the same s blade type that mine came with. If you can swap out fans and are you using a fan controller?

[s14_sport]

Ok ill give it another shot, is there any bleeder screw on the cooling system to make it a lil easier?

if you're running the stock intake manifold I believe there is alittle screw on there somewhere. but running without the cap is quicker IMO

[Funktown240]

Just an idea, when I bought my 240 it had the same cx radiator and 2 12"fan's and was having issues with running warm. The cheap china fans could not keep up, I bet you anything yours are the same s blade type that mine came with. If you can swap out fans and are you using a fan controller?

Thats what i was thinking, I dont have a fan controller also. The fans are always on. . . . . .Im going to bleed the cooling system again and see if it helps. If that doesnt work then im going to mount the fans on the front of the radiator.

[kouki-gymkhana]

If you are running the stock intake manifold, the bleeder screw is on the intake side just before the intake runners. It is a 10mm bolt, IIRC, and this is where I have always bled my system from. In retrospect, I need to go back and bleed it again with the front of the car jacked up. Someday...

[turboredneck]

the easiest way I found to bleed all the air out is fill the radiator full, crank the car with cap off and heater on full blast. When it starts to blow hot air out of the vents crack the bleeder screw on the top of the intake to let the air out. Refill radiatorand replce cap. Done. As for your overheating problem, I have a obx radiator and 1 10" fan on the bumper side of the radiator pushing air thru. When going done the highway I can turn my fan off and not run hot. Sounds like a air bubble or a thremostat stuck shut.

[gawdzilla]

Thats what i was thinking, I dont have a fan controller also. The fans are always on. . . . . .Im going to bleed the cooling system again and see if it helps. If that doesnt work then im going to mount the fans on the front of the radiator.

dont move the fans to the front. that will only make things worse. like people are saying1) make sure your coolant is bled right2) make sure your fans are pulling heat off the radiator3) if 1 and 2 are good, your fans aren't doing their job.. get new ones.

[Funktown240]

Ok went ahead and moved the fans to the front of the radiator with a shroud and it helped a little. I need some weather stripping to make the shroud the most efficent though. Today when I was driving the battery light came on- then a light bulb popped into my head. If the alternator and water pump are on the same pulley then something should be wrong with the belt, but the belt seems tight. I might replace it just to see what happens cause im blowing fuses like crazy. I sure dont hope that my pump and alternator are taking s***s on me

[Darius]

The fans are garbage, replace them. See gawdzilla's post above.

FYI, pushers are less efficient than pullers. You probably just got a better seal on the shrouds and they seemed to work a little better than the previous setup.

Just do yourself a favor and spring for some new ones. Cooling issues suck a**.

[Funktown240]

The fans are garbage, replace them. See gawdzilla's post above.

FYI, pushers are less efficient than pullers. You probably just got a better seal on the shrouds and they seemed to work a little better than the previous setup.

Just do yourself a favor and spring for some new ones. Cooling issues suck a**.

The fans are not the problem. . . . .I can feel the air moving through the radiator. Either the thermostat is stuck or the water pump is bad, Im going to check it out on Wednesday. I destroyed the stock clutch fan and ruined my S14 radiator when I was testing out my suspension and got a little too excited drifting and s***. So im thinking that I f***ed up the pump as well.