My point was that operating temps shouldn't vary by more than 10°F while the car is moving. If they do, something is wrong with the coolant system, or it is overly stressed by additional modifications. The coolant system is designed in stock form to keep temps within a very small window, and it does this well.
Vadim, you're asking about whether or not 212°F is an adequate temperature to have the radiator fans turn on? I wasn't aware of when they come on for a stock car. If it's as high as 212°F I can say I wouldn't do it that way, but there are other reasons they might do that. Also, there should be a speed component to that. You'd hope the fans wouldn't come on unless the car was traveling less than 10 mph or so. Why might Nissan have the fans turn on so late?
They might feel that having the radiator fans turn on creates so much noise for the passenger and those outside the car that they'd rather they never turn on at all. Since this isn't possible, they turn them on at the last moment to provide a ride through the city with relative quite operation without having the fans come on every time they come to a stop light.
Or, they could have done plenty of research and found that most of the time people come to a stop, they will move again shortly after they stop providing air flow that will cool the coolant quick enough so they don't have to turn the fan on.
I do believe having the radiator fans on is considered a last resort by car designers to keep noise levels down.
Personally, I like to see the temps under control more than I worry about noise levels. For that reason, I have my fans come on pretty soon after temps start to climb.
Vadim, you're asking about whether or not 212°F is an adequate temperature to have the radiator fans turn on? I wasn't aware of when they come on for a stock car. If it's as high as 212°F I can say I wouldn't do it that way, but there are other reasons they might do that. Also, there should be a speed component to that. You'd hope the fans wouldn't come on unless the car was traveling less than 10 mph or so. Why might Nissan have the fans turn on so late?
They might feel that having the radiator fans turn on creates so much noise for the passenger and those outside the car that they'd rather they never turn on at all. Since this isn't possible, they turn them on at the last moment to provide a ride through the city with relative quite operation without having the fans come on every time they come to a stop light.
Or, they could have done plenty of research and found that most of the time people come to a stop, they will move again shortly after they stop providing air flow that will cool the coolant quick enough so they don't have to turn the fan on.
I do believe having the radiator fans on is considered a last resort by car designers to keep noise levels down.
Personally, I like to see the temps under control more than I worry about noise levels. For that reason, I have my fans come on pretty soon after temps start to climb.
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Originally Posted by robj80 
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