Quote:
Originally Posted by YellowJacket
Not true. This fan is triggered by a sensor in the engine bay when the ambient temperature reaches 168 degrees for more than 10 minutes I believe, and it is controlled by a fan computer behind the ecu in the trunk. If your fan is on all the time, you need to replace your fan computer. It is bad. When you turn you car on the engine fan should NOT come on if everything is working properly. If it does come on, then its in failsafe mode from a failed component, most likely the fan computer.
As mentioned you can pull the wire from the sensor in the engine bay to test the system. If it doesnt turn on after you unplug it, you have another problem and can test the fan itself by running 12v to it to confirm the fan itself turns and wiring works there.
If it does turn on when you unplug the fan wire from your sensor but doesnt turn on after Sitting idle for a while after a very spirited drive then you either have a relay, sensor (not as likely), or a fan computer malfunction (very likely). The sensor is testable with an ohm meter and some hot water but like I said its the least likely to fail in my opinion. The fan computer failing is probably the main cause of fail-safe (always on with ignition).
The fan is not loud, but you can hear it, and it draws a good amount of air (and dust) from outside to inside, so you should definitely be able to tell its on audibly if you are listening for it and by the feel of the air induction with your hand or hold a piece of paper against it and it will suck it to the car... cigarette would work if you smoke.
The haynes manual or BGB states all this a bit more eloquently, but thats the deal paraphrased.
side note: The cooling fan dummy light in the dash is ONLY for this fan. It lights up when the fan SHOULD trigger on but does not. It has nothing to do with the liquid cooling system.
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the relay is turned on by the COR...... which turns on when the key is set to on, not necessarily when the engine is running. It turns on when the temp reaches where it should.
the sensor is not a switch style sensor.... strangely enough, even though the technology was there for a switch style thermistors, this one isn't.... it's a true thermistor (I know this because I had to use one as an intake sensor on a JDM gze). Also, I doubt there's a timer built in as there's no need for one.
so, if you had read what I said correctly.... it can turn on when the key is set to on... I did NOT mention engine bay temp.
Further, if you all want to go on about this.... there is little that the side vent does at above 35mph..... aerodynamics of the car make it somewhat useless.... the lower plastic covers (and the vents in the engine lid) are meant for air movement to go from under the car to up through the engine bay. So, for anyone wanting to add a fan to the engine lid for whatever reason, wire it as a puller.