[DeTomaso] Before my fans wouldn't run... now they won't shut off!

Christopher Kimball chrisvkimball at msn.com
Wed Jun 9 20:17:44 EDT 2010


I have Dakota Digital relays on my fans, and they have an adjustment so you can determine how long the fans will run after the car is turned off.  I have mine set for 15 seconds, for no particular reason, but what I found annoying was that if I let the car sit for a minute or so after the fans had turned off, then turned the ignition key to the accessory position, the fans would turn on again due to the "still hot" engine.  I found out, just by accident, that at that point, if I turned the key off and then quickly on again, the fans would stay off.

I don't know if that would work with your system, but it's worth a try!

Chris
#3846

> From: MikeLDrew at aol.com
> Date: Wed, 9 Jun 2010 18:58:05 -0400
> To: charlesmccall at gmail.com; detomaso at realbig.com
> Subject: Re: [DeTomaso] Before my fans wouldn't run... now they won't shut	off!
> 
> 
> In a message dated 6/9/10 13 54 3, charlesmccall at gmail.com writes:
> 
> 
> > What could be possible causes? I have a late-model car, with the Rick
> > Moseley kit installed with relays in the front trunk.
> > 
> 
> That's the cause.
> 
> The stock fan scheme has the fan relays powered by *switched* power.   The 
> Moseley kit sends *unswitched* power to the relays.   The ground is provided 
> by the thermoswitches in the radiator.   So the fans will continue to run 
> after the key is shut off, until the temperature drops enough to open the 
> switch and thus remove the ground from the relay.
> 
> There is a way to rejigger the system so that another relay is added to the 
> mix, so that the power from the aux fuse block on the relay kit panel first 
> passes through an ignition switched relay.   That way, the power is removed 
> when the switch is turned off.
> 
> Or something.
> 
> Mike
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