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Stopping the radiator fan when the car is off

 
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Old 08-04-2015, 01:19 AM
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Stopping the radiator fan when the car is off

Hi all,

I own a 1991 Honda Prelude Si 4WS Cita edition.

As some of you may know, our cars can wake people up at night when our radiator fan runs for 10 minutes after the car has been switched off.

The footpath outside my house is on a bit of a decline, and I have found if I park my car the other way around (where the car is facing the road on an incline where the bonnet is about 15-20 degree's higher than the rear) that it stops the fan running after the engine is switched off.

I'm wondering if its just my car that does this or if others can do it as well?
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Old 08-04-2015, 02:02 AM
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Re: Stopping the radiator fan when the car is off

Mine doesn't change on an incline. Weird!
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Old 08-04-2015, 11:14 AM
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Re: Stopping the radiator fan when the car is off

Mine never did run after the engine was shut off. Not sure why, but it was like that for the 8 years I owned the car. The fan functioned normally when the engine was running. I kind of liked that it didn't run after shut off so I never looked into fixing it.
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Old 08-04-2015, 02:22 PM
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Re: Stopping the radiator fan when the car is off

Put that fan on a toggle switch if it's that concerning to the neighbors. However, I would never want to risk a car fan on a toggle switch and forgetting to turn it on.
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Old 08-04-2015, 02:32 PM
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Re: Stopping the radiator fan when the car is off

^^Agreed. I'd rather wire the fan to a circuit that is only energized when the key is on and have it always run when the car is running than wire in a toggle switch.

BTW Kolusion, what is a Cita edition??? I've never heard of that. Where are you from?
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Old 08-04-2015, 05:08 PM
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Re: Stopping the radiator fan when the car is off

Mine never runs once I have switched off the key and functions normally while the car is on.
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Old 08-04-2015, 08:57 PM
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Re: Stopping the radiator fan when the car is off

You can disable the fan run on feature by removing the temp sensor circled in the picture below and joining (short circuiting) the two wires that run to it. Doing this will not change the way the fans operate with the ignition turned on, it only stops the fans from running with the ignition off.

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Old 08-04-2015, 10:31 PM
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Re: Stopping the radiator fan when the car is off

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Originally Posted by luzer View Post
BTW Kolusion, what is a Cita edition??? I've never heard of that. Where are you from?
The Cita edition (and Cita Deluxe) edition where two special editions released in Australia during the end of manufacturing (mine was built in November 1991).

I believe the Cita edition included all extras except leather, and the Cita Deluxe edition included the lot.

This is my Cita. You'll see the factory decals on the side:

http://s30.postimg.org/luxqd2qwh/image.png
http://s10.postimg.org/mwgkucc5l/20141026_113243.jpg

I'm from Melbourne, Australia.
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Old 08-04-2015, 10:50 PM
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Re: Stopping the radiator fan when the car is off

Cool car!!!

Mine never ran with the car off until I replaced it.
The replacement comes on when the ignition is turned off and runs 13-15 minutes regardless if the engine was even run...or not when activating/deactivating the ignition.
It doesn't run at odd times. But a while ago I used to read others say pretty regularly their's kept killing their battery...
Even had a name for the phenomenon...
"2am battery killer issue"...the solution seemed to be replace the timer box.

Could be a solder thing....
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Old 08-04-2015, 11:04 PM
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Re: Stopping the radiator fan when the car is off

I suspect it may be failing to activate as a result of a thermostat problem.

I replaced my thermostat 5 months ago with a new one from Honda and realised yesterday I did not bleed the cooling system at the time of changing over the coolant (when I replaced my thermostat) plus I probably used cheap 33% pre-mix radiator fluid, which has caused the thermostat to seize.

As my thermostat is starting to fail to open when the car is a flat level and always on an incline, I suspect the radiator fluid isn't getting through to hit the switch at the base of the radiator which is why the fans are failing to active (some times even when the car is running!).

I am going to flush the radiator today and use correct radiator fluid (50/50 premixed, not 33/66 which I suspect I have in there now) and see if this fixes things. If not I will just have to buy a new thermostat and learn from this lesson.

Last edited by Kolusion; 08-04-2015 at 11:07 PM.
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Old 08-05-2015, 12:08 PM
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Re: Stopping the radiator fan when the car is off

Holy moly, your car is in a perfect condition for the age. Well done.
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Old 08-05-2015, 02:01 PM
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Re: Stopping the radiator fan when the car is off

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Originally Posted by ausluder View Post
You can disable the fan run on feature by removing the temp sensor circled in the picture below and joining (short circuiting) the two wires that run to it. Doing this will not change the way the fans operate with the ignition turned on, it only stops the fans from running with the ignition off.

I'm pretty sure that I DON'T have that circuit/Module in my car...
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Old 08-05-2015, 10:31 PM
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Re: Stopping the radiator fan when the car is off

According to my repair manual(pretty sure) That's the P.A sensor . Pressure Absolute Not Manifold pressure. Some are located there and some right at the e.c.m.I remember cause that was one input of the e.c.m. for regulating the egr valve. My B20 5-SPEED 91 dOES HAVE IT.
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Old 08-05-2015, 11:26 PM
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Re: Stopping the radiator fan when the car is off

Mine didn't have that part in that location (ignore the yellow arrow, I was pointing out the ignitor in this pic)...


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Old 08-06-2015, 12:01 AM
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Re: Stopping the radiator fan when the car is off

That picture is of my '89 AUDM 5spd b20a6, it doesn't have an EGR system. I should've mentioned that, other markets may be different. Kolusion's Cita should have it since it's an AUDM model.

The part that is circled is an engine bay temp. sensor, it triggers the fans to run when the ignition is off and engine bay temps are high. On hot days, even if the engine was cold, turning the ignition on and then off again would cause the fans to start.
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Old 08-06-2015, 01:36 AM
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Re: Stopping the radiator fan when the car is off

Sorry, but your book or user is incorrect, that is the under hood/engine bay temp switch not the PA sensor. It is closed above 70*c if I remember correctly. This swich in usdm(and I believe all north america) is located in the thermostat housing and looks like a regular temp switch and has a blue connector. On non-usdm they use the sensor pictured above. It concists of a bi-metalic disk that deforms based on tempurature to close internal contacts and activate the condencer fan relay. This bi-metalic disk is insulated by porcalin, as the the disk flexes through out its life, it can break this porcalin and become loose in its housing and ground out. That's why when you park nose down, the fans run, because the metal disk contacts the aluminum housing of the sensor. If you want to disable the fans from running after the car is off, all you need to do is unplug this sensor. The fans will continue to operate normally with the engine on.

Last edited by luda8890; 08-06-2015 at 01:45 AM.
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Old 08-06-2015, 10:06 AM
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Re: Stopping the radiator fan when the car is off

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Originally Posted by luzer View Post
Mine didn't have that part in that location (ignore the yellow arrow, I was pointing out the ignitor in this pic)...


lol i always wondered what that crusty ass plug was on my car.
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Old 08-06-2015, 10:21 AM
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Re: Stopping the radiator fan when the car is off

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lol i always wondered what that crusty ass plug was on my car.
Haha...yeah for some reason Honda used a clear shield on that so you can see the dielectric grease on the connector. Kind of looks like crap.
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Old 08-08-2015, 11:43 AM
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Re: Stopping the radiator fan when the car is off

specially after 25 years. Its yellow, crusty, and gross haha
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