Radioator fans shut off with key

Busdriver · Post by **Busdriver** » Fri Nov 18, 2005 9:22 pm

Are the radiator fans supposed to keep running when the key is turned off?
Most cars will still keep running, and shut off on their own.
After I turn off the engine and the fans were running, I usually turn the ignition on again to let the fans do their work, often this will take up to a couple minutes....
Is this factory, or something wrong?

vrg3 · Post by **vrg3** » Fri Nov 18, 2005 9:33 pm

On our cars they turn off within a few seconds of you turning the ignition switch off.

Manarius · Post by **Manarius** » Fri Nov 18, 2005 9:38 pm

Yeah, they go off within a few seconds. Besides, the fans aren't going to do a whole lot just sitting there with the engine off.

Busdriver · Post by **Busdriver** » Fri Nov 18, 2005 10:28 pm

So it's not imperative that the fans keep cooling?
Why do the newer cars keep running their fans for several minutes after the engine is turned off?

Manarius · Post by **Manarius** » Sat Nov 19, 2005 1:16 am

Busdriver wrote:So it's not imperative that the fans keep cooling?
Why do the newer cars keep running their fans for several minutes after the engine is turned off?

Because they're retarded? (Neither my 97 or 03 do this)

Splinter · Post by **Splinter** » Sat Nov 19, 2005 3:41 am

Busdriver wrote:So it's not imperative that the fans keep cooling?

Definitely not.

Once the car is off, it's not creating any more heat. Therefore the temperature cannot increase past what it was at when the car was on.

If anything, keeping active cooling going would be BAD for the car, since the faster metal cools, the more likely it is to crack.

scuzzy · Post by **scuzzy** » Sat Nov 19, 2005 6:49 am

Splinter wrote:
Busdriver wrote:So it's not imperative that the fans keep cooling?
Definitely not.

Once the car is off, it's not creating any more heat. Therefore the temperature cannot increase past what it was at when the car was on.

If anything, keeping active cooling going would be BAD for the car, since the faster metal cools, the more likely it is to crack.

Technically, the coolant and therefore temperature of the block will increase 10F (or there abouts) immediately after the engine is cut off. The deeper portions of the block furthest from the coolant and oil passages are the hottest, while the closer you get to the coolant/oil passages, the cooler the block gets. So when you shut the engine off, the "core" (you could say) warms the rest of the block to it's temperature in an effort to shed heat.

So, the block does get warmer, yes.

But not by much. Maybe 10 degrees at the most.

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Radioator fans shut off with key

Radioator fans shut off with key