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Location:
WA
Registered:
November 2003
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thermo fans
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Wed, 26 November 2003 13:36
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how effective are thermo fans when used instead of the factory belt fan?
i put 2 12 inch's on my ga70 only to find that on my first drive round town it almost hit redline temp...was not impressed.
plus i put them on a direct switch so could be operational all the time
would have been better putting just one 16 inch?
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Location:
Perth
Registered:
August 2003
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Re: thermo fans
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Wed, 26 November 2003 13:43
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i know someone that blew up his radiators n two 12inch fans in his supra so he got a 16inch
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Location:
WA
Registered:
November 2003
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Re: thermo fans
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Wed, 26 November 2003 13:48
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and the 16 incher allowed the engine to not overheat?
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Location:
Perth
Registered:
August 2003
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Re: thermo fans
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Wed, 26 November 2003 13:50
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yeah it works great 
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Location:
Brisbane
Registered:
July 2003
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Re: thermo fans
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Wed, 26 November 2003 13:53
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I'd like to go to thermo in the Soarer....
However, I've been told that they won't drain any power from the engine above 2000rpm... And they move a shitload of air.
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Location:
Perth
Registered:
August 2003
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Re: thermo fans
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Wed, 26 November 2003 14:28
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wait it's only a 14" he just told me
but brand new
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Re: thermo fans
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Wed, 26 November 2003 15:31
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Well, I have one 14" Davies Craig on my car, and a brand new radiator (did both at once), and when setting up the thermo, you are supposed to set it to come on at the hottest it can, start the car, let it idle until the temperature is jst above where it normally sits, and then wind the sensor back until the thermo kicks in. When i did this on mine, the temperature never went above normal.
So my guess is that your radiator/thermostat/water pump is stuffed. The thermo/fan radiator doesnt do much once you start travelling 60+ kph.
Even in the heat of summer, mine only turns on when I sit in traffic for ages, and even then, its only on for 30-60 sec at most
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Location:
Perth
Registered:
October 2003
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Re: thermo fans
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Wed, 26 November 2003 23:29
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A 16" will move as much air as 2 14" fans, but still not as much as your belt driven fan.
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Location:
Brisbane
Registered:
May 2002
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Re: thermo fans
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Wed, 26 November 2003 23:56
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Why did you replace the factory engine-driven fan? It's big, it's effective, and it drains SFA power when the fluid coupling disengages. If your shiny new thermo fan isn't doing the job, piss it off and put the engine fan back on!
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Location:
Melbourne
Registered:
October 2003
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Re: thermo fans
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Thu, 27 November 2003 00:22
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Norbies got a good point about the std fans! if it aint broke don't fix! and if they wern't good they wouldn't use them!
but if your are going to use thermos:
On the twin 12" thermo's, depending on where you get them from, the actual effectiveness can vary heaps...
With different sized thermo fans go for the ones that will give you best coverage of your radiator.. A single that only covers 60% of the radiator can be worse off than 2 smaller ones that cover a larger percentage..
Go for powerful (heavy) fans.. ie, ones that flow/blow good.
I've seen 12" aircon condenser fans used as thermos and they don't do shit!!!
Also suck thru the radiator, it's the most effective way.
Lastly make your you've got the polarity right!!! a fan figting against the wind while driving will overheat your engine in about 5 mins or less!
Cheap tip is 2 thermo's off a camira.. about $30 each, and works REALLY well... (enogh to stop a radiator that was boiling out the cap to being able to take the cap off w/o a hiss in about 45 seconds.
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Location:
north brisbane
Registered:
September 2003
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Re: thermo fans
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Thu, 27 November 2003 00:30
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hey guys...i got a 12 inch on my ta22 with a 2TG and my car still over heats at times....thats without the engine fan..
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Location:
WA
Registered:
November 2003
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Re: thermo fans
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Thu, 27 November 2003 08:23
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yeh the only reason i put the two 12inch thermo fans on was because the factory one is so fukin loud it sounds like i drivin a a small truck at times.
after the conversion it sounded way better cept then found the problem that it over heated.
addmititly the fans were pretty cheap ones so that may be the reason...
so now the std fan is back on and it runs fine, so yeh dunowhat happenin...
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Location:
Brisbane
Registered:
May 2002
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Re: thermo fans
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Thu, 27 November 2003 09:26
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You know why it was loud? Because it was moving LOTS OF AIR! Your new fans are quiet because they're no longer moving lots of air. See the connection here?
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Location:
berala sydney
Registered:
November 2002
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Re: thermo fans
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Thu, 27 November 2003 10:35
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hi 2Lsupra
just a quick question did you have the thermo fans running in the write direction
cya knackers
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I supported Toymods
Location:
Epping, Sydney
Registered:
May 2002
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Re: thermo fans
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Thu, 27 November 2003 11:34
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as a matter of interest, find a hwy and drive along that.
if it still overheats, your problem isn't the fan (as it wont be on once you're travelling at speed)
Also, do you have a shroud for it? Unless it's shrouded, or the fans are *perfectly* mounted, they'll just blod air around the engine bay, rather than sucking it through the radiator.
I have the AU falcon thermo setup here, factory shroud and all. fingers crossed it does the job! (it's like twin 14" or something tho, so it should be fine)
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I supported Toymods
Location:
melbourne.victoria.austra...
Registered:
June 2002
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Re: thermo fans
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Thu, 27 November 2003 19:49
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good feedback dudes.
so whats the better way to mount the fan - push or pull?
i mounted my celica fan to push thru the radiator, and, blimey it does a good job (needless to say it covers the entire ta22 radiator)
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I supported Toymods
Location:
Epping, Sydney
Registered:
May 2002
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Re: thermo fans
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Thu, 27 November 2003 20:26
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pull is generally considered the best method
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Re: thermo fans
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Fri, 28 November 2003 00:27
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Unless you need the room in the engine bay, then definately pull.
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Location:
Brisbane
Registered:
June 2003
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Re: thermo fans
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Fri, 28 November 2003 07:35
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BUy a new radiator is my advice.
A chevy 4 core one fits in an ma61. Ive done it. If it fits in an ma61, im damn sure itd fit in an ma70. Water capacity may be letting you down also.
Once im complete putting the radiator in mine, ill post pics and pics of the bracket i made to help others do the conversion.
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I supported Toymods
Location:
Epping, Sydney
Registered:
May 2002
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Re: thermo fans
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Fri, 28 November 2003 07:36
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if all he changed was the fans, a new radiator is not the answer.
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Location:
Melbourne
Registered:
May 2002
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Location:
WA
Registered:
November 2003
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Re: thermo fans
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Sat, 29 November 2003 04:04
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hey sorry been away for a while,
yeh i maked sure that i checked the polarity so that was right.
but nah i didn't have a shroud, i think that may have been a big problem...
and yes i did take it on the HWY for a test and it ran fine.
so leads to it was soley that the thermo fans jsut couldn't produce the goods.
the factory is back on now and is runnin good. (cept for the truck like sound)
thanx for all yas help
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Location:
Brisbane
Registered:
July 2003
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Re: thermo fans
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Sat, 29 November 2003 05:19
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How prone to failure are the standard clutch fans?
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Location:
sunny coast, qld
Registered:
October 2002
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Re: thermo fans
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Sat, 29 November 2003 05:37
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I know what you mean about the truck sound 2lSupra! Before my old gz20 soarer had an exhaust, the fans were the only thing you could hear! 
BTW I have a single 14" on my Corona with a Chaser Radiator pushing air through as there is no room to pull. I will tell you how the setup goes.
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Location:
Rocklea qld
Registered:
February 2003
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Re: thermo fans
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Sat, 29 November 2003 08:01
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I work in a radiator shop and see this problem all the time and there could be many causes and solutions.
1. are the thermos in a shroud of any type or just on the radiator because with thermos the shroud serves a big purpose in pulling the air through the radiator.
2. Air the thermos set to pull the air through the radiator and not trying to push it back out the front.
3. If the core is a thick one say 4 or 5 row u need a bloody powerful set of thermos to pull the air back through.
4. Maybe u just have low powered thermos.
5. After seeing many jobs we have concluded the standard fans work alot better then thermos most of the time.
6. try placing one thermo on the motor side of the radiator in some sort of shroud so it pulls the air through the radiator. then place the other thermos the bumper side of the rad on the opposite side to the other thermo but not in a shroud and wire it so it pushes air insted of pulling it then it will push air through the rad towards then engine.
Where abouts are u located. Brisbane. If so i might be able to take a look at it.
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Location:
WA
Registered:
November 2003
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Re: thermo fans
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Sun, 30 November 2003 08:47
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yeh i think the prob was prolly a combination, no shroud, possibly weak fans and theres the air conditioning condenser in front of radiator...
well actully i in perth so yeh, ne ideas on where to get a shroud from though? perhaps certain factory ones on some new model car?
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Location:
Brisbane
Registered:
June 2003
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Re: thermo fans
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Sun, 30 November 2003 10:39
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clutch fans "fail" when they get old, because the fluid leaks out of them, and they no longer lock up when the car is getting hotter (they have a coil on the front of the motor..which acts on the temp of the air going by) And if you're real unlucky, they can seize, which will keep the car nice n cool, but itll drink lots fuel and drain a lot of power.
the fact that 2 12's cant cool a 1ggte is ridiculous! in traffic, theyd suck a lot more air than the clutch fan doing 6-700rpm. There's obviously something wrong with the way your system is set up...on top of a missing shroud...or they are dodgy fans.
if you want a shrouded pair, but some off an "ef" or an "au" falcon. An "el" pair will be too big. They use flat bodied fans which are super efficient and work well.
if you have lots of room in front of the engine, you could even use a single commodore one (off like a vs) which also comes with a shroud..they also work very well and efficient.
[Updated on: Sun, 30 November 2003 10:41]
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