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When overheating, should the fans stay on?

 
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Old 07-26-2010, 08:07 PM
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When overheating, should the fans stay on?

Yeah..still having the 'overheating' issue but I think my car is lying to me. If the car is overheating, should the cooling fans stay on until the engine coolant temperature has dropped down, or should they only come on for a few seconds at a time ragardless if the gauge shows the temp is overheating?

That make sense?
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Old 07-26-2010, 08:17 PM
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Re: When overheating, should the fans stay on?

the fans should STAY on until the engine cools down sufficiently.
if the gauge is reading its too hot, but the fans are cycling on and off, it prolly isn't really overheating.

are there any conditions/scenarios that it only overheats? like at idle, highway, cruising, etc?
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Old 07-26-2010, 09:56 PM
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Re: When overheating, should the fans stay on?

Scenarios; It's completely sporadic on what days it happens, but when it does, 90% of the time I'm idling, 9% it's right after I take off from a stop light, and 1% as I'm cruising. Air Conditioner seemingly has limited effect on it, although sometimes turning it on while the gauge is registering hot just makes it 'hotter'.

Reasons I think it's not actually getting hot;

-I've flushed the system 3 times- Currently running a 40/60 coolant to water mix with Royal Purple 'Purple Ice' coolant additive.
-Changed the Thermostat to a 180 degree
-Replaced ECT sensor
-Replaced Temperature Sending Unit
-Bled the system of air.
-Replaced the radiator cap
-Performed a pressure check- held fine.

-If the gauge reads Hot, while coasting down the road, I can turn the car off and pop the clutch to turn it back on (or key-start it), and in those 5 seconds of not running the temp readout will return to normal.

-I can't say I know the difference between 180 degrees and 220 degrees to the touch, but feeling the upper and lower hoses when the gauge says normal or hot hurt about the same.

I haven't gotten to test with a IR temp gun, but both fans come on fine, and will stay on for 10-20 seconds before sutting off, regardless of if the gauge says Hot. They've never come on and stayed on for longer than that.

The only real variable I can think of is that it's an aftermarket radiator that I did not install. It's from Performance Radiator and appears to be just a direct OEM replacement, not all fancy and thick like the Koyo's.
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Old 07-27-2010, 12:22 AM
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Re: When overheating, should the fans stay on?

I've had the same problem but didn't do none of that cause I'm pretty much assuming it's bsing me.
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Old 07-27-2010, 08:50 PM
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Re: When overheating, should the fans stay on?

does turning the heat on help it? may sound a little weird. but it should. and when you can't be to sure, a few seconds of discomfort is better then a blown engine.

i wouldn't think you can feel a difference between 180 and 220 degrees. but when my lude is at normal running temperature, i can feel a difference between the lower and upper hoses. nothing extremely drastic. but a temperature difference nonetheless. there has been times when i can't feel the difference though. i would think immediatly after the fans got done running you might feel a difference. or after coming to a stop and turning off the car..
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Old 07-27-2010, 10:12 PM
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Re: When overheating, should the fans stay on?

I've tried the heat pulling air from outside the car thing a couple of times, mainly when I had the car at home and had the opportunity to walk around it while it was reading hot but the gauge fluctuated just the same as always, so I noticed no effect. Should I have turned the heat on recirculation?

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Old 07-27-2010, 11:48 PM
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Re: When overheating, should the fans stay on?

Well one suggestion I got was a faulty gauge.
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Old 07-28-2010, 12:47 AM
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Re: When overheating, should the fans stay on?

So would replacing the cluster theoretically help?
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Old 07-30-2010, 11:34 AM
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Re: When overheating, should the fans stay on?

I have the same problem as you man. Pretty much the exact same problem. The only differences are my fan's pick and choose for when they want to come on. I have seen them and heard them on before but it's very rare. Unless I was to jump them then they work fine. My gauge does exacltly what yours does and if i turn my car off then back on it will go back to half. The only exception with my problem that is slightly different then your problem is if my music is on full blast my guage goes to the red zone but if i turn it down some times the guage will go down with it. I have also changed my theromstat and still the same issue. I also tried a new fan control module and it didn't change a thing except now sometimes my fan works on there own. I do have have some new(used) temp sensors that i want to try and put in I grabbed them out of a car in the wreckers. But I still don't think it going to fix my issue. hopefully once you figure your issue out it will be the same problem that mine is having lol
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Old 07-31-2010, 04:13 AM
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Re: When overheating, should the fans stay on?

Just a suggestion (to help save your engine while you figure out the problem) have you thought about running a simple switch to your radiator fan so you can control when it's on or off, and therefore keep cooler air on your radiator for longer too.

I'd also think about any potential air locks as i'm assuming you drained the whole coolant when you changed all those parts. I know you said you bled the system of air, but if it's over heating and the majority of those parts are new, then that's one thing I'd re-do just to be on the safe side.
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Old 07-31-2010, 04:47 AM
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Re: When overheating, should the fans stay on?

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So would replacing the cluster theoretically help?
I would believe so but I'm not sure ya wanna waste the money and its not a guarantee fix.
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Old 07-31-2010, 04:40 PM
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Re: When overheating, should the fans stay on?

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I would believe so but I'm not sure ya wanna waste the money and its not a guarantee fix.
Exactly why I ask so many questions about it
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Old 08-01-2010, 11:33 AM
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Re: When overheating, should the fans stay on?

I was thinking about making a switch for my fan. But at the same time i like when everything works the way it was meant to lol. plus i wouldn't want to forget about turning it off. But i have been toying with the idea. But it still doesn't solve my tempurature gauge problem. :( also is there a way i could wire up the fan to turn on with the car and off with the car?
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Old 08-01-2010, 07:03 PM
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Re: When overheating, should the fans stay on?

you can wire to anything that turns on and off with the turn of the key.
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Old 08-01-2010, 10:49 PM
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Re: When overheating, should the fans stay on?

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Exactly why I ask so many questions about it
Lol I would hope so with all the money you already used up trying to fix it lol
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Old 08-02-2010, 06:26 AM
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Re: When overheating, should the fans stay on?

Mine does the same as yours. Has for 7 years. I have checked with an IR gauge and it reads 180 even when the gauge is in the red. I have also replaced the sensors, thermostat, and done a couple flushes over the years. I am thinking mine is the gauge because that is about the only thing left it could be. An engine doesnt cool down from the red back to normal after just shutting it off and restarting almost instantly.
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Old 08-02-2010, 06:29 PM
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Re: When overheating, should the fans stay on?

Other than the ECT sensor and the temp sending unit sensor (they're right next to each other underneath the thermostat housing), are there any others sensors that could effect the gauge readout?

In other terms, are there any other sensors that I can freakin change so I don't have to try buying another gauge cluster? Or are there just the two?
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Old 08-04-2010, 08:46 PM
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Re: When overheating, should the fans stay on?

Alright I acquired another gas/temp gauge cluster. I'll post again if it overheats to report that replacing this part didn't work. If I don't post again, it worked! haha
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