COOLING FANS

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Hi Guys,
I have installed an electric 16 inch hi po fan, the question I have does anyone know where I can find a timer for it, what I am trying to do is have the fan run for 5-10 minutes after shutting down the engine, this way I can have a cool down after shutdown and probably eliminate hard hot soak start. I have the termostat control that came with it and it works fine while the engine is running.
Thanks Fred
 
Just wire the thermostat for the thermo so it is live when the engine is off that way it will shut down when it is cool enough. :) or a manual switch ( to bypass or not use the thermostat ) that is live so you can turn the fan off and on as you need.

A time is only what you need for Turbos. 8)

This should be in the Elec section. :shock:
 
8)

Most auto parts stores that carry electric fans should have a thermostatic switch to make it come on when a certain temperature is reached.

Just make sure the fan is wired to a point where it can only get power when the ignition is on.
 
Wire it to a "constant power" source, not "switched". Whenever the temp switch reaches the selected temp, the fan will switch on wheather the car is running nor not.
 
ANLUSHAC11, You mention that you should make sure that the wiring is tied in with the ignition, so that the electric fan will not run when the ignition is turned off! Is that so you don't drain your battery while the engine is not running??? If a person wants the fan running after you turn off the engine (for cooling down purposes); you might have to sit there for 10 or 15 minutes with the ignition on, in order to cool it down! I do not have an electric fan presently, but would like to install one. My 200cid seems to run somewhere around 180-190 while driving, but jumps up to 220 or 230 after I shut the engine off! So I would like for the fan to kick on after I shut the engine off, but do not want to sit there for 10-15 minutes with the ignition on, in order to cool down the engine!??? Would there be that much of a drain on the battery if the fan ran for 10-15 minutes?? I have noticed that some newer cars will have an electric fan running after the owner has turned off the ignition and walked away! Jim
P.S. I just read LaGastra's post about the constant power source right after I posted; so I take it that there should not be a problem!!!????
 
Here's something to think about...

If you are gonna do a 'turbo-timer' type delay on the thermo fans, wouldn't you want to complete the circuit? What I mean is this...

What I have thought about, in my own ponderings along this line, is that cooling the fluid in the radiator is only half the equation.

If you are concerned enough about heat that you want to cool it after shutting off the engine, then I would be just as concerned about the effects of a high contrast in temperature by starting the motor after cooling the fluid in the radiator. If you have removed the heat in the fluid from there, it does not necessarily follow that the block is cool. Coolant is not flowing through it.

Start the motor and you are gonna run cold fluid into a hot block.

There would be a very small amount of cooling of the block from airflow, and there will be some transfer of heat in coolant along the pipes, but I still think that it would not be healthy to kick it over while the block was hot if the radiator is cold. Even over time, it might increase warpage and wear.

One possible solution would be to run an electric water pump instead of the mechanical, and include it in the timed circuit, thus keeping the coolant running through the block while the fan is running.

The other thing to consider would be to control it with a thermostat. Personally, I would prefer that. Drop the temp under a certain threshold... shut down the cooling process.

Dan
 
I've got my fan wired constant (on a thermo switch also) it will run for a while after shutting it down but has yet to give me any problems with re-starting etc... BTW my thermo switch "sensor" is in the upper radiator hose

you could always use a turbo timer to run your fan for a specific time after shutdown
 
That's what they do in the wintertime anyway, when the first opening of the thermostat. the cold water from the radiater flows into a lot hotter block.
Fred
 
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