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electric fan turned on--and it wasent overheating??

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Old 11-25-02, 05:33 PM
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electric fan turned on--and it wasent overheating??

i was just driving around, and i heard the electric fan switch on. the temp gauge didnt show that it was overheating, and i wasent leaking anything.
what could it be?
im going to flush my radiator tomorrow prob to clean it all out...and then check all the hoses.

anyone have this happen?
Old 11-25-02, 05:44 PM
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The sensor is located on the tube near the water pump. If you disconnect it, the fan runs. It may be a bad thermo switch, or possibly the wire connecting it. Check those.

Greg O.
Old 11-25-02, 06:32 PM
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wait... what FC comes stock with an electric fan?
Old 11-25-02, 06:34 PM
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My 87 TII has one.
Old 11-25-02, 06:43 PM
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stock!?!?!
Old 11-25-02, 06:55 PM
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Yup.
Old 11-25-02, 06:56 PM
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Uh, that's supposed to happen.

TIIs and other RX-7s with A/C came with a small aux electric fan.
Old 11-25-02, 07:13 PM
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well mine has a manual one, i have a switch for it on the dash. but i didnt switch it on and it just popped on, in the summer when its super hot, it goes on, but its like 35-45 degrees out.
Old 11-25-02, 07:17 PM
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Then you have a short somewhere...I have no idea...If you have modified the wiring of your fan, it could be anything. Best inspect the wiring and relays involved to check for possible problems.
Old 11-25-02, 08:34 PM
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are you talking about the stock one?? or did you add one? the stock one shouldn't come on till 220F or when you turn on the A/C
Old 11-25-02, 09:37 PM
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i looked under the hood and i saw that my temp sensor is disconnected. could this be whyh my fan wont turn off??

Old 11-25-02, 09:41 PM
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and can everyone see this pic?
Old 11-26-02, 03:14 AM
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Originally posted by BlackFC_NYC
...my temp sensor is disconnected. could this be why my fan wont turn off?
Yes! Unplugging that sensor will make the fan run.
Old 11-26-02, 10:08 AM
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ok, does anyone have a picture or can someone take a picture of that wires properly installed. cause i dont know why the hell its disconnected.

i guess thats the reason!
Old 11-26-02, 11:11 AM
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Well damn, learn something new everday, didnt know they came with an electric fan. Odd, none of my AC equiped N/A cars ever had an electric fan, nor do i see anything about it in the manual, but, i guess you guys cant be lying. Neat.
Old 11-26-02, 11:24 AM
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Originally posted by NZConvertible
Yes! Unplugging that sensor will make the fan run.
Actually I think if you ground it the fan runs.

Rob
Old 11-26-02, 12:11 PM
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well if thats the temp sensor, and the temp gauge still works, and the fan is always on now, what the hell is that wire? you know? shouldnt the temp gauge not work now that the wire is hanging loss? this is anoying
Old 11-26-02, 01:32 PM
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Originally posted by BlackFC_NYC
well if thats the temp sensor, and the temp gauge still works, and the fan is always on now, what the hell is that wire? you know? shouldnt the temp gauge not work now that the wire is hanging loss? this is anoying
You say you have a manual switch to run the fan. Your problem could be the switch, the wiring to the switch or the relay. I'd check the wiring to the manual switch first. If that wire is grounded the fan will run.

Does the fan run all the time? Or does it cycle?

Rob
Old 11-26-02, 05:04 PM
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Originally posted by Rob500
Does the fan run all the time? Or does it cycle?
it only used to go on when it was really hot out in the middle of the summer, or when i flicked the switch for whatever reason, which was barely ever

i disconnected the fan at the fan. so now its not running. although on the dash the little red light on the temp gauge goes on now, which usually goes on if your overheating and then fan goes on, but im not overheating according to the gauge.

ill check for a rely to the fan switch.

mike
Old 11-26-02, 11:05 PM
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My fan comes on in the summer after spirited driving. Or if I have the car parked after driving it a while I will turn the key on and it will run. I guess the sensor gets heat soaked and clicks the fan on.

James
Old 11-27-02, 01:06 AM
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Originally posted by BlackFC_NYC
ok, does anyone have a picture or can someone take a picture of that wires properly installed.
From your photo it looks like your sensor wire's just broken. Just find the other end of it (match the colour) and solder it back together.
Old 11-27-02, 01:11 AM
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Originally posted by Roy James
...didnt know they came with an electric fan.
I believe it was an option in the US, but all the FC's I've seen (JDM) have them.
...nor do i see anything about it in the manual...
It's at the back of the Cooling System chapter in the S4 and S5 FSM's and on page 101 of the Haynes manual.
Old 11-27-02, 01:20 AM
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Originally posted by Rob500
Actually I think if you ground it the fan runs.
Not on the S4. The fan temp switch is normally closed and opens when the trigger temp is reached, turning on the fan. So pulling the wire off will have the same effect.
The S4 has quite a complicated system because it has a warning light that comes on when the fan runs due to high temp, but doesn't when the A/C runs the fan. It has a little control box under the dash.
The S5 doesn't have a warning light so the system is much simpler, just a relay switched by the temp switch. Grounding the S5's fan temp switch terminal will make the fan run.
Old 11-27-02, 01:26 AM
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Originally posted by BlackFC_NYC
well if thats the temp sensor, and the temp gauge still works, and the fan is always on now, what the hell is that wire? you know? shouldnt the temp gauge not work now that the wire is hanging loss?
That temp switch is just for the fan. The temp sender for the gauge is on the side of the engine's rear plate under the oil filter and next to the oil pressure gauge sender.

I think that's enough from me...
Old 11-27-02, 02:48 AM
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Originally posted by NZConvertible


I think that's enough from me...
Let's see... 1,2,3,4 posts in a row... I guess all 4 of your voices in your head had something to say.



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