Re: can you run the low speed cooling fan all the time? - Saab General Bulletin Board - Saabnet.com


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Re: can you run the low speed cooling fan all the time?
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Posted by Ari [Email] (more from Ari) on Sat, 13 Dec 2008 11:09:18 Share Post by Email
In Reply to: can you run the low speed cooling fan all the time?, Richard9000, Fri, 12 Dec 2008 18:22:59
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As BobS notes, the cooling fan usually only runs at idle, and even not always then. The purpose of the cooling fan is to provide airflow when the car isn't moving. If the car is moving, that is a lot more airflow than the fan can provide.

You'll notice that the sensor (thermoswitch) is on the output of the radiator - that's the cold side. The hot coolant arrives at the top end, and gives up its heat as it moves to the bottom. The switch should only come on if that output coolant is pretty warm, and that only happens if there is no airflow over the radiator. And no airflow over the radiator for a while.

Take the car for a drive and get it nicely warmed up. Come to a stop and let the car idle. Depending on the outside temperature, the cooling fan should kick on after a while. If the temp gauge crawls up to the red and the fan doesn't come on, there's a problem. But if the fan kicks on after a couple/five minutes, and then cycles off, the fan is working just fine. If you are where it is cold, it may take quite a while to come on, if at all - if the radiator can throw off the heat without the fan, it will.

But it's normal for the fan not to be running when the car is moving, and normal that it isn't running all the time the car is at idle.

To answer you question - can you run the fan all the time? Yes - at speed, it won't matter at all. At idle, it's just a bit more electrical drain. The downside would be reduced fan motor life. It was designed to operating intermittently.

posted by 99.159.103...

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