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Fan comes on after shutoff?

Old 09-05-2015, 10:10 PM
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Question Fan comes on after shutoff?

Hi all. Recently picked up a new 991tt from a 991s. When I shut down my 991s a cooling fan in the engine bay almost always came on. Haven't noticed that on the turbo... Yet. Does the cooling fan in bay come on frequently? Or do you really need to push it?


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Old 09-05-2015, 10:47 PM
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I don't recall mine running after shutoff yet.
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Old 09-06-2015, 09:59 AM
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Same here. My C4S was frequently running after shutdown. Have not had this on the TT yet after 3 weeks.
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Old 09-06-2015, 11:02 AM
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2 months of ownership and haven't seen that since day one...
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Old 09-06-2015, 01:01 PM
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After 11,000 miles and 1 year of ownership I have not seen the fan on when the engine is off. I felt the same as you-- that something is wrong-- when I first took possession of the car. I brought it by the dealership and they said this was normal and there were no fault codes.

You recently posted about the cool-down period for a turbocharged engine. Page 221 of the Owner's Manual states the engine blower fans sense engine temperature up to 30 minutes after the engine has been turned off. The blower fans will activate in this time period if the temperature exceeds whatever limit has been exceeded. Also the engine's radiator fans located in the front of the car may be silently running when the engine has been turned off. This is the primary cooling system for the engine.

Finally, I have to believe that Porsche has designed in a lot of temperature monitoring safety systems for a 500+ hp engine with twin turbochargers shoe-horned in the back of the car that has automatic engine shut-off as its Normal ECU mapping!
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Old 09-06-2015, 02:17 PM
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Default Fan comes on after shutoff?

Normal - mine does it
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Old 09-07-2015, 10:40 AM
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Default Fan comes on after shutoff?

Happened once after I was very late for work
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Old 09-07-2015, 11:12 AM
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That's why...
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Old 09-08-2015, 12:35 AM
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Originally Posted by NorthvilleStig View Post
Happened once after I was very late for work
I had a pretty fun section of driving the last 2 miles before I got to my office. If I was in a mad hurry, the fan would remain on as I ran in the building.
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Old 09-09-2015, 10:53 PM
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Normal days I haven't noticed the engine bay fan. However, on warm ambient track days...yeah, pretty much every time I shut down in the paddock the fan cuts in.
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Old 09-10-2015, 10:44 AM
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Yep my TT fans run on when the ignition is shut off... only after it's driven VERY hard.

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