355 Fans

Nope. The driver's side only gets voltage when the car is on, or the key in accessory mode, and the sender in the radiator sensing 195+ degrees. The passenger side fan works off an ECU signal which I don' think is available unless the car is on (even with the key in accessory mode).

The fans are easy to replace.

 

As the fans age, they operate slower which means they pull less CFM air. Then they operate intermittently, and sometimes they start burning fuses. You can't believe the difference until you replace them - new ones sound like jet turbines. So if yours are original they might be due to be replaced.

I believe these are a direct replacement for OEM:

Amazon.com: Spal 30102113 16" Curved Blade Extreme Performance Fan: Automotive

Although some folks here use another model that pull slightly less CFM, but also use slightly less amps. There is an entire analysis in this thread:

http://www.ferrarichat.com/forum/348-355-sponsored-bradan/300662-new-updated-f355-radiator-fan-information.html

 

Mine do not run after shutdown.

 

Jack the fan man is the place to get the spal fan. I also rigged my drivers side fan to run off of a manual switch even when the key is in the off position. Nice to leave the drivers side fan on for a minute or so when you shut down after a hot day run. The challenge cars have a diagram in the manual on how to do this. I think its the 2049 model but can't remember and too tired to check. All you have to do is change the plug end with your old one. Heres the link to the page.http://www.the-fan-man.com/shop/size-pull-part-2049-p-219.html?cPath=33&osCsid=76471d4181f32f07ecd768b14f41fd8d

 

this^

 

Do your sound like turbines. I dont think i have ever had the pass side run. Drivers side sounds pretty loud though.

 

Then you have to check your fuse...

 

If there is not a pump circulating coolant after shut down what's the point of having the fans run? It will only cool what's in the radiators.

 

The fans will move much of the heat off of the engine. Its not just to cool the coolant. Your engine reaches its highest temps in the first few minutes after shut down. Always good to pop the engine compartment lid on a really hot day after shut down. Even better if your fan runs for another minute or so.

 

I can agree that if there is air forced, or freely flowing over the engine it will cool faster after shut off, but the common thought that the engine gets hotter after is shut off is a myth. All heat generated in the engine comes from combustion and friction with combustion being the major source. They both cease when the engine is turned off. No heat generation, no net increase in temperature. What does happen is the engine tends to go to a more uniform temperature so the distribution of temperature in the block, coolant, etc changes. Cylinder walls start cooling immediately. The coolant and the external surfaces of the block may increase in temperature because they are absorbing heat from the hotter, internal parts of the engine which are cooling. This may be mistakenly lead one to believe that the engine is heating up. But the hottest parts of the engine; the piston tops, inside of the cylinder walls, valve heads, combustion chamber and such start too cool immediately after the engine is shut off since they are no longer being subjected to the heat generated by combustion.

 

Turn off your engine after a hard drive, but leave your key on and keep your eyes on the temp gauge. Is it getting cooler? When your engine is running, the cooling system is moving coolant and if the car is moving it is also moving air over the engine. When you shut down, there is nowhere for this heat to go and for a few minutes, the overall engine heat is much higher.

 

Automatic cool down relay is easy also, I think we talked about that. (i'm half senile at times)
On hot turbo cars we run a oil cool down also with external pump to cool the oil down a few so ti dont heat soak too much. adds to tubo life for sure. A gentle cool down is always better. Taste great less filling

 

Coolant temperature is not engine temperature. Yes the coolant in the engine gets warmer because it is absorbing the heat from the cylinder walls and combustion chamber, which are getting cooler because they are dumping heat into the water. If they were not getting cooler the water would not be getting warmer. As I said, it is a redistribution of heat, not generation of additional heat.

Simple thermodynamics and conservation of energy. You have (heat generated by combustion) - (heat lost to the surroundings) = (time rate of change of heat stored in the system). When the engine is shut off the (heat generation) = 0, the (heat lost) is reduced since the water is no longer circulating, but it does not go to 0. There is still heat lost to the air flowing around the engine. Thus you have - (heat lost) = (time rate of change of heat stored). The heat contained in the system immediately starts to decrease (negative rate og change). Total heat stored in the engine and coolant can not increase without a heat source. So the fact that the coolant temperature rises after shut off is proof that the higher temperature parts of the engine are indeed cooling off.

 

Yes and it is better to keep cooling with air when the engine is off so you reduce the over all engine temps as the coolant is in the engine as well as the rads. Ever notice an F1 car pull into the garage and fans immediately set on the air intakes while the engine is off? Same idea.

 

You get a little convection going on from the fans. Sometimes too much and that's the reason to cover the headers to keep the heads from cracking due to cooling too fast.

Ohh our twisted world of race cars LOL

 

Last night I drove my 355 and when I was going to park it while I put the top down. While I was doing so I put my foot under car just a little in front of rear tire. Holy S@/t was the air hot. I'm talking blister your foot hot. I checked drivers side and it was slightly hot but could have left foot there all day. Why the big temperatures from the two sides?

 

Why my understanding is the second fan only goes on for the oil cooler.

 

The computer turns on the second fan by reading the coolant temperature. The right fan cools both the oil radiator and the right hand side coolant radiator. If your fan is not on, you probably have a burnt fuse.

 

...or a bad coolant temp sensor.

 

My left fan wasn't kicking on. Fuse was fine.
I'd see the temp climb at lights & idle. Start driving again, it would drop.
turned out to be the coolant sensor. Easily replaced. It's working again and the temps are stable.

 

He's just detailing what he knows. I enjoy reading it evokes though in the part of my brain I thought was dead. Reminds me of when I had a real job.

 

Tim according to the wsm which i rad for the four hundreth time it says the fan on the rhs only kicks in if the temp gets above 95c and i dont think mine ever gets this hot. Mine is usually between 200f and 183 f