quick fan question...
12-30-2016, 09:27 AM
#2
Rennlist Member
Why would you want to check them? If inoperable, they would throw a code. My experience is that they rarely go on. After a track session in summer heat, I always hear them after pitting. That's 25 minutes in the 4k-7k range of driving and oil temps at 255. Same track in the fall, they do not go on all the time.
12-30-2016, 10:52 AM
#3
Rennlist Member
Thread Starter
After taking them off during the wing install and on my way home the car lost some coolant...
...found the cap was about two turns loose, but really want to just make sure they are hooked-up right and eliminate any possibility of overheating.
Have a code for wing and brake light only.
What's their purpose, anyway?
...found the cap was about two turns loose, but really want to just make sure they are hooked-up right and eliminate any possibility of overheating.
Have a code for wing and brake light only.
What's their purpose, anyway?
12-30-2016, 11:52 AM
#4
Nordschleife Master
You could easily pull the fan housing off to see if they connected the fans correctly - it's only one plug for each fan
12-30-2016, 12:01 PM
#5
Banned
Join Date: Jan 2013
Location: Chicagoland Area
Posts: 26,141
Likes: 0
Received 5,395 Likes
on
2,513 Posts
Pull heat out of the engine bay. Mine have ever only kicked on after a run in the hot-hot summer when I pull into the garage and turn off the car. They run for a few seconds (<30-60) and shut off automatically. Not very often. My car runs very cool and I have a few miles of 25-30 MPH roads before I hit my garage.
12-30-2016, 01:57 PM
#6
Race Director
You can test the fans using a Porsche diagnostic computer which has the ability to command the fans on. 'course, this requires a trip to the dealer/service.
Another way would be to supply 12V power to the fans through their electrical connectors but you want to be sure you don't *zap* the fans or the car's electrical system
In both cases above this just checks to ensure the fans run. It doesn't test the circuitry that decides it is time to turn the fans on.
To do this you need to cause them to come on because of engine compartment temperature.
To do this take the car out and drive around -- around town is better than on the highway -- until the engine is fully up to temperature. Ideally you would want to hear/feel the radiator fans running. Do not have the A/C on.
Then in your driveway raise engine RPMs to say 1K or 1.2K and hold for 30 seconds or so. Then let the engine idle for a bit. Repeat this until the fans come on. They probably won't come on until the engine compartment tempeature gets up to (my experience with my Boxster) around 135F.
If you have the capability of monitoring the intake air temperature you can monitor this as it will to some extent reflect engine compartment temperature.
At some point the fans will or should come on and run a while then shut off. But without knowing how hot the engine compartment is if the fans do not come on it may be because the compartment is not hot enough. If the fans are not working right and if you don't get an error warning or warning light you don't want to overheat the engine compartment.
It might be possible to apply some low heat to the engine compartment temperature sensor and trigger the fans with the engine and engine compartment cool.
Another way would be to supply 12V power to the fans through their electrical connectors but you want to be sure you don't *zap* the fans or the car's electrical system
In both cases above this just checks to ensure the fans run. It doesn't test the circuitry that decides it is time to turn the fans on.
To do this you need to cause them to come on because of engine compartment temperature.
To do this take the car out and drive around -- around town is better than on the highway -- until the engine is fully up to temperature. Ideally you would want to hear/feel the radiator fans running. Do not have the A/C on.
Then in your driveway raise engine RPMs to say 1K or 1.2K and hold for 30 seconds or so. Then let the engine idle for a bit. Repeat this until the fans come on. They probably won't come on until the engine compartment tempeature gets up to (my experience with my Boxster) around 135F.
If you have the capability of monitoring the intake air temperature you can monitor this as it will to some extent reflect engine compartment temperature.
At some point the fans will or should come on and run a while then shut off. But without knowing how hot the engine compartment is if the fans do not come on it may be because the compartment is not hot enough. If the fans are not working right and if you don't get an error warning or warning light you don't want to overheat the engine compartment.
It might be possible to apply some low heat to the engine compartment temperature sensor and trigger the fans with the engine and engine compartment cool.
12-30-2016, 02:27 PM
#7
Race Director
If they aren't working as intended, an error message will pop up. I had one not working and was covered under warranty. Got an immediate message on the cluster.
No message = you're fine. Don't worry.
No message = you're fine. Don't worry.
Trending Topics
12-30-2016, 07:36 PM
#9
Rennlist Member
I lose more rubber grommets than my dealer has in stock 
12-31-2016, 09:55 AM
#11
Banned
Join Date: Jan 2013
Location: Chicagoland Area
Posts: 26,141
Likes: 0
Received 5,395 Likes
on
2,513 Posts
12-31-2016, 10:51 AM
#13
Rennlist Member
Thread Starter
