Radiator Fans stuck on, lets figure it out Options

[Defgeph]

Erik sent me a link about how to correct the fans running constantly after removing AC.

The way one guy fixed it was jumping two pins on this plug below



This was on a 5th gen. I was wondering if any of you 6th gen guys not running AC has the fans running full time. I just tryed jumping the plug but the fans still continued running.

So, anyone else that could try to jump this plug and post the results that would be a great help.

DEF

[lagos]

i dont see how AC would make a difference or not.

there is a temp sensor on the passengers side of the radiator. you have to plug the 3s harness into it. if the sensor dosnt get pluged in, or is missing, the fans will stay on all the time, as a safetly feature. maybe the ST raditor dosnt have the sensor and thats why your fans are staying on?

[Rjb23]

If DG did your harness your fans will stay on all the time, he wires them that way on purpose, I believe that is what he told me. Mine stay on all the time too.

[brianforster]

lagos is correct, the ST radiator does not have the sensor, therefore your fans will run all the time.

[BBoYRuGGeD]

yap exactly how mine is...it starts running at normal op temp and never stops...lol tho i dont see this being a problem tho, atleast we wont overheat hahah

bboy

[Defgeph]

Well now. This means we should figure out how to get it working properly, I do not like that fans on all the time.

How would I wire this up to run properly ? DG I'm going to pm you.

[BBoYRuGGeD]

us ST guys are probably just going to have to swap to a GT radiator which has the sensor lagos is talking about (i think?). or even better...maybe a koyo one hMmMmM

bboy

[brianforster]

mine actually come on as soon as i turn the key to on, but i think that has something to do with my fan relay wire leading to nowhere..

im going to replace the radiator down the road with a GT one, simply because i dont like having to union the two lower radiator hoses together, but mark said even in his car with the koyo his fans were on all the time.

but jeff if you figure it out with the ST radiator let me know!

[DG_Performance]

The fan temp wire comes from plug EA1 if i remember correctly. I will have to look it up for sure but i think it is a light green color wire. I think it might have a black stripe on it too?
dg

[Supersprynt]

i dont see how AC would make a difference or not.

there is a temp sensor on the passengers side of the radiator. you have to plug the 3s harness into it. if the sensor dosnt get pluged in, or is missing, the fans will stay on all the time, as a safetly feature. maybe the ST raditor dosnt have the sensor and thats why your fans are staying on?

The absence of a looped circuit does make a difference. It is not just the temp sensor it is several sensors that if not working or disconnected the fans will run. When I removed my a/c, my fans stayed on, so a/c most definately makes a difference.

[brianforster]

i dont find it to be that big of a deal, but it is a constant reminder that we have done non oem work to our car and to me thats annoying

but like i said im a perfectionist, and i have a soft spot for oem quality things, which is why im going crazy trying to get my engine bay looking good.

[Supersprynt]

Ok well I just jumped mine and it DID fix the fan problem. So basically it depends on which one of ur plugs/sensors isnt connected thats causing it.

So if you have fans constantly on after u remove your a/c - jump the grey plug that looks like above by the firewall. Jeff I'd leave it jumped because if your messing with something you wont know its fixed unless thats jumped.

This post has been edited by Supersprynt: May 14, 2006 - 4:41 PM

[lagos]

i just looked at my plug today. its a 2 wire plug with white and blue (with black stripe?) wires on it. it is located on the bottom of the radiator on the passengers side. if u dont have that pluged in, or dont have the sensor on your radiator, then the fans will stay on all the time.


i think in order to have eriks fix work, you also have to have a GT radiator with a temp sensor on there.

This post has been edited by lagos: May 14, 2006 - 5:04 PM

[brianforster]

sounds right to me lagos, unless of course like my wiring your fan relay leads no where ill have to figure that out whenever i get a GT radiator!

[Supersprynt]

Well I diagree with Art. There are several plugs in which the fan power runs through in order to create a closed loop. If any one of those plugs or sensors is malfunctioning/disconnected then the fans stay on. As it happens the plug in MY problem was the a/c. This doesnt mean its NOT that problem but could be a couple. If Jeff fixes his issue w/o jumping that plug then that would mean its a GT - only problem. As of right now I'm not so convinced the wiring is that different between trims.

[brianforster]

lets put it this way erik, my car is an ST and my engine harness is a GT harness mated with a 3sgte harness, the only two plugs on the harness not in use are cruise control and coolant temp.

[Supersprynt]

So what your saying is that your car doesnt know how hot your coolant is?

Thats a bad thing.

[brianforster]

the coolant temp sensor on the radiator is for deciding when to turn on the radiator fans, the coolant temp sensor on the thermostat is a diff sensor.

[lagos]

So what your saying is that your car doesnt know how hot your coolant is?

Thats a bad thing.

there are 3 coolant temp sensors on the car.

one for your gauge
one for your ecu
one for the radiator fans

[Rjb23]

mine actually come on as soon as i turn the key to on, but i think that has something to do with my fan relay wire leading to nowhere..

im going to replace the radiator down the road with a GT one, simply because i dont like having to union the two lower radiator hoses together, but mark said even in his car with the koyo his fans were on all the time.

but jeff if you figure it out with the ST radiator let me know!

I didn't join 2 radiator hoses together for mine, i did at first but it poped off and I lost all my coolent and got stranded. After that I went to autozone and found a radiator hose from another car that fit perfect but I don't know what kind of car it was from.

[brianforster]

i dont think mine will pop off, the clamps i used to clamp it down are tough ****.. haha

[Defgeph]

I'll have to look into this a little more. I'll jump the first plug by the fire wall again. The funny thing is I dont have any other plugs except the AC pump plug.

Now that I type this I remember a loose plug in front besides the AC plug.

Could you guys give me a wire color break down on the rad temp sensor plug ?


Thanks for the help. And another great thread !

[brianforster]

i would if i was home but im back at school.



theres two groups of wires over on the passenger side of the engine bay though IIRC. one coming from the relay box, one in that loom from over the block , to the alternator, a/c, etc.

im pretty sure its gonna be coming out of that relay box, but its definitly on the passenger side of the engine bay.

This post has been edited by brianforster: May 14, 2006 - 9:01 PM

[Defgeph]

Erik, did you completely remove your AC ? Do you still have the pump plugged in ?

[Supersprynt]

No everything is out.

[lagos]

defgeph

Could you guys give me a wire color break down on the rad temp sensor plug ?

lagos

i just looked at my plug today. its a 2 wire plug with white and blue (with black stripe?) wires on it. it is located on the bottom of the radiator on the passengers side.

This post has been edited by lagos: May 14, 2006 - 9:43 PM

[Defgeph]

In theory, if I jump both these plugs the fans should work properly.

What do you guys think ?

[lagos]

In theory, if I jump both these plugs the fans should work properly.

What do you guys think ?

no, if you jump the radiator temp sensor, the fan will never come on . you need a raditor with a temp sensor. if that dont fix it, you need to jump the wire erik posted.

[brianforster]

it depends on what kind of signal the ecu is expecting from the radiator temp sensor

that sensor tells the ecu when the radiator is hot enough to warrant fans, if you jump it the fans will stay off.


this begs the question as to how the 7afe ecu knows when to turn the fans on without this sensor.

This post has been edited by brianforster: May 14, 2006 - 10:33 PM

[lagos]

it depends on what kind of signal the ecu is expecting from the radiator temp sensor

u need the temp sensor. trust me.

[Defgeph]

no, if you jump the radiator temp sensor, the fan will never come on . you need a raditor with a temp sensor. if that dont fix it, you need to jump the wire erik posted.

This make perfect sense. I'd like to find another way, if not. I'll have to put in a GT radiator with the temp plug.

With out a sensor there is no indication for the fans to kick on to start cooling

[brianforster]

I still wonder how the ST does it then

[Defgeph]

Ok, the sensor in the radiator measures the water temp. Once the water gets to hot the sensor sends a signal to turn the fans on. Without the sensor there the fans are constantly running in a safty mode due to a failed radiator sensor.

The reason our fans are always running is because we (ST's) do not have this sensor.

[brianforster]

err sorry I should have clarified, I knew all that, I wonder how the ST knows when to turn these fans on if it does not have a temp sensor on the radiator.

Are the fans always on in a normal ST?

[Defgeph]

Good question, that fans operate normally on a ST with out this sensor

[lagos]

err sorry I should have clarified, I knew all that, I wonder how the ST knows when to turn these fans on if it does not have a temp sensor on the radiator.

Are the fans always on in a normal ST?

for the st the sensor is located in coolant housing below distributor and
contains a single-pin connector with a Blue/Black wire.



everything you ever wanted to know about the 6th gens cooling fans:
ST
http://www.celicatech.com/imagearchive/bgb...ling%20fans.pdf

GT
http://www.celicatech.com/imagearchive/bgb...0four%20cyl.pdf

This post has been edited by lagos: May 14, 2006 - 11:25 PM

[brianforster]

ok then, it seems the simplest solution would be to get a GT radiator

[Clipsetuner]

Electric Fan Controller

One of my best investments ever.

DTE

[DG_Performance]

You guys are funny.... thinking of all kinds of ways to rewire and swap rads out when you dont have to.

The temp switch on an ST is under the distributor!
the temp switch on a GT is in the bottom of the rad!
The ST rad is smaller than a GT rad and the GT rad is smaller than the alltrac rad so if you put 2 and 2 together... i wire it to run all the time to prevent overheating! If you are doing some hard driving the ST rad might not be able to cool the water fast enough and cause overheating since it is not meant for that kind of powerful motor.

DG

[Rjb23]

You guys are funny.... thinking of all kinds of ways to rewire and swap rads out when you dont have to.

The temp switch on an ST is under the distributor!
the temp switch on a GT is in the bottom of the rad!
The ST rad is smaller than a GT rad and the GT rad is smaller than the alltrac rad so if you put 2 and 2 together... i wire it to run all the time to prevent overheating! If you are doing some hard driving the ST rad might not be able to cool the water fast enough and cause overheating since it is not meant for that kind of powerful motor.

DG

Exactly what I had said!

[Supersprynt]

I have a GT radiator and never had any problems with cooling.

[BBoYRuGGeD]

question for u ST guys still on ur ST radiators w the swap...does ur fans turn on as soon as u turn the key to the on position or does it turn on when normal op temp is reached?

mine starts when normal op temp is reached btw

bboy

[lagos]

I have a GT radiator and never had any problems with cooling.

same here, and my fans come on and off like a normal car.

[brianforster]

mine turns on with the key

[Defgeph]

Soon as I turn the key they switch on. I'm going to try to get this working without a GT radiator, just the sensor. I need to talk to dave about how the car is wired right now. If it's to much of a hassle, I'll just leave it the way it is.

Or I might wire in a switch to turn the fans off. I'm only doing this so I can listen to the engine and troubleshoot some sounds. With the fans on its very loud and I can't hear the engine to well.

We'll see

[BBoYRuGGeD]

ah ok...i'll ask Dr Tweak how he wired mine up because mine only turns on when i hit normal temp op. i can see how it would get annoying when the fans turn on right after u turn the key to the on position.

bboy

[brianforster]

im also thinking that my fans being on all the time is not letting my engine get up to normal operating temp

[Defgeph]

With my fans on full time I have no problem warming up to full temp.

[brianforster]

ok then, that theory, GONE!


thermostat replacement it is, lol

[brianforster]

bboy did you ever find out how tweak wired yours

[Supersprynt]

The jumper is something youll have to do when you take out your a/c. I think you guys need to jump those pins or connect the wires because even if you do get to the real problem, you may not know because of this additional issue.

[BBoYRuGGeD]

bboy did you ever find out how tweak wired yours

he didnt really get back to me about it...i think he's still too busy on his move down to the south

bboy

[scothaniel]

I didn't feel like reading all three pages, so if this has already been stated, I appologize....

The radiator fan temp switch (sensor) which turns the fans on, is located on the lower radiator on the GT and GT4 models, and on the engine coolant kneck for the ST model. If your using the stock ST fuse block, look for the blue-white wire in the EA1 plug (I can get the exact location later tonight). This needs to go the temp switch. The GT's temp switch wiring is on the engine room harness (the same bundle as the headlights) and therefor doesn't have this problem.

I bought a Koyo radiator for my car, since the water inlet/outlet lines up perfectly with the 3S motor and had the threaded boss for the switch.

Then there is the A/C pressure switch, which will also activate the fans. This is the plug shown on the first page. You'll have to jump the wires togther as stated before if you've removed A/C.

This post has been edited by scothaniel: May 30, 2006 - 1:48 PM