Question about aux fan switch and abnormally high oil temps

[Z1XX3R]

So I was searching the board for normal oil temps on a stock motor and I read in a couple of those posts that people mention an aux fan that is suppose to kick on at a certain temp(and this is also running at the same time as the clutch fan is doing it's job as well correct?)

Now if I remember correctly, that is the same fan that is suppose to kick on when the ac is running as well correct?

Okay so lately I have noticed a couple of things....

1. Depending on what time of day I'm driving my car, I notice that my oil temps will rise to the "normal operating temp" and continue to rise to over 110 degrees Celsius. So far I haven't seen it to higher than that but I know that this temp is pretty high for just normal driving.

2. My clutch fan seems to be loud during the duration of my drive once the car gets to operating temperature and I never notice any other fans kicking on. The only time I hear that aux fan turn on is when the ac is turned on.

I know that the stock gauges are horrible at giving me the most accurate temperature to go off of but just from reading on this forum I know that my temps aren't suppose to be that high at all and it seems like I have an issue that I can't seem to pinpoint. Is that fan suppose to kick on at some point and if so does anyone know when or how to check on when it's suppose to?

Would a nismo t-stat and a bigger radiator help combat my high oil temps? Or is the solve all solution, is go buy an aftermarket oil cooler?

Thanks for all your help guys.

Kleigh

[MikeyRHD]

Not sure what car you have but if the wiring for the aux fan is the same in all of them (I have a 32 so that's what I'm basing this on) then it is not linked to the a/c at all, the aux fan is connected to a temp switch in the rad and turns on above ~90c.

[caliber676]

Easy way is to temporarily wire in a switch to keep the aux fan on.

But from a logical standpoint, if your coolant is at the right operating temperature than you should be fine for your other temps. Things like combustion leak into the crankcase can cause high temps but that almost always accompanies poor performance problems.

A cooler will help when moving but in traffic it's not gonna do much unless you put a mini fan on it lol

[zero_wheeler]

I'm a bit confused by the post, are you having coolant temp issues, or oil temp issues? You reference oil temps, but talk about the coolant system?

[NismoS-tune]

If the clutch fan clutch is buggered, the fan will sound very loud, if that can't keep up, you could overheat,

what's your cool temps at?

[Skym]

The heat exchanger (behind oil filter) can shift the heat from high coolant temps to the oil.

If coolant temps are rising, then it's most likely the thermostat late opening and / or blocked radiator. Thermostat can be checked by touching bottom radiator hose when engine is up to operating temp (should be cold which means thermostat hasn't opened).

With engine fan going flat out, can be due to the clutch part on fan that locks. But if coolant temps are higher, the heat from radiator could be constantly hitting clutch part on fan thus making the clutch on engine fan engage all the time.

The engine fan works by hot air from radiator hitting spring on front of clutch that expands and engages clutch more thus engine fan spins faster.

Aircon fan (infront of radiator) should kick in around 90 degrees C (from memory) with coolant temps (switch in bottom of radiator, green plug / loom that runs down driver side of radiator shroud). That indicates your coolant temps are too high which would explain the high oil temps. Aircon fan is designed to kick in on extreme hot days in Japan with aircon on (high coolant temps).

[dc23]

I ran my R32 at two track events that were in the 40's C - the first event, my oil temps were soaring so I got a oil cooler and that worked wonders. but then at the second event, my water temps started getting into the red zone. I would suggest getting an electric fan and installing to the ignition if you want to keep your motor cooler.

[Z1XX3R]

Sorry for the late response back to all of you guys that replied so quickly to this post, my job has a tendency to make me work ridiculous hours for weeks at a time....

zero_wheeler//I know that I talk about both oil and coolant temps, but that was with reference to the heat exchanger. If I am getting high oil temps due to the heat transferring from the coolant to the oil; then would a solution to bring my temps down on both the oil and the coolant side be to get a bigger radiator and a lower temp thermostat(nismo t-stat)? Or would that not have an effect on bringing my oil temps down at all?

I have noticed lately that my oil temperatures (referencing the stock gauge) have been inconsistent. Some days, they range from 90C to 110C, and other days, they will be well over 110C climbing just below 120C.

If I were to buy an oil cooler, would that only solve my issues while the car is in motion? Or would I still have spiking temperatures during a normal commute?

Does anyone have a diagram on how to wire a switch for the AUX fan?

Thanks again for all your help, guys. I really appreciate it.

[Z1XX3R]

Bump, anyone?

[99_SI]

For all intents and purposes you should wire in a switch on the coil side of the relay for the aux fan. Will try to get you a schematic. Thinking to go that way as we'll on my 33gtst. I did convert from clutch to electric fan also. Another possibility is the sandwich is getting plugged on the coolant side. Also try changing your coolant.


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[caliber676]

To put it in simple terms. Your car has a problem if your gauges are reading accurately. May it be coolant or oil related something is causing overheating. The vehicle isn't designed to overheat so it would make sense that something you have needs to be fixed. A mechanic would never put in a bigger aftermarket parts like radiators and fans to fix an overheating issue, that's not fixing the problem.

Find the root cause. Start doing deductive thinking and testing. Check your coolant condition, check for leaks and blockages. Check your oil system, proper pressure? No combustion leak to crankcase?( permissible limits)

[Z1XX3R]

Thanks guys. I'm going to try a few things, I believe that I have inaccurate gauges or maybe an electrical problem. My temp gauge and oil temp gauges went wonky today. They were showing that I was overheating, then cold and it repeated this for about 10 minutes. After that the gauges settled to what I believe is the correct temp. I guess it might be a lot more complex than I had originally thought.

Does anyone know of any common electrical problems with this car?

[caliber676]

Gauges and temp sensors are prone to giving false readings, especially after 20 years .