Noise after shut down - C450 - Turbo Cool Off
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2016 C450 AMG, 2015 QX80
Noise after shut down - C450 - Turbo Cool Off
When I shut down the car, I hear a noise (fan/motor) sound for a few seconds after. What's that?
Also, wouldn't it be smart if the turbos cooled down a little before shutting the car off?
Also, wouldn't it be smart if the turbos cooled down a little before shutting the car off?
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2013 650i Coupe, 2010 IS250 AWD, 1999 S500
It's a fan doing what it is supposed to do, cooling the car off. Most newer turbo cars do this. The car is cooling off as you drive it, but turbos require more cooling once at rest, hence the fan you hear. Completely normal.
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BMW e89 Z4 sDrive 35i & MB S205 C200 AMG Premium Plus
Fan cooled turbos?
Modern turbos shouldn't need babying but you might help by taking it easy driving wise for a few minutes after a good blast.
The fans could be anything, main engine, electrical ballast, modern cars have all sorts.
Pretty sure the turbos are oil cooled tho, main fan is for engine block and ancillaries.
Modern turbos shouldn't need babying but you might help by taking it easy driving wise for a few minutes after a good blast.
The fans could be anything, main engine, electrical ballast, modern cars have all sorts.
Pretty sure the turbos are oil cooled tho, main fan is for engine block and ancillaries.
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2016 c450
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From: Orange County
C450
Yes, what you hear is a recirculating pump that continues to circulate oil through the turbos after shut down to cool them. Most modern turbocharged cars are using them now. No need to keep the car running before shutting down.
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2003 CL 600
Those auxillary pumps move coolant through the turbos, not oil, but yeah they can run for anywhere from a couple seconds to several minutes after shutdown to keep the temps from getting too high in the centersections of the turbos. Nothing new, those have been around for a long time.
The fan is no different, the PCM looks at temperatures when you shut it down, and has authority to run the fans as needed after shutdown to keep it from heat soaking too badly.
The fan is no different, the PCM looks at temperatures when you shut it down, and has authority to run the fans as needed after shutdown to keep it from heat soaking too badly.
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