When I put my fan system in, I first wired it to be powered all the time, so
that it could continue to cool the engine as suggested. I wasn't happy with
it that way. It stayed for a very long time and ran down the battery quite
a bit, since the fan draws 8 amps. Part of the reason is the hysteresis in
the thermostat -- it turns on at one temperature and turns off at a lower
temperature. (I used one from VicBrit with separate thermostat.) I now
have it going off with the ignition switch, and like it much better. I
probably should have put a relay in, and plan to add that soon. It's been
no problem for 2 - 3 years.
Sumner Weisman
Date: Wed, 4 Apr 2001 10:04:40 -0500
From: David Massey <105671.471@compuserve.com>
Subject: Re: Switched power for fan
Message text written by Barry Schwartz
>>>Engine cooling fans are typically fed by "always on" current, not from a
>>source that would require the ignition to be in the "on" position. The
>>reason for this is so the fans can run a while after the engine is
>>switched off (to speed cooling of the radiator once air flow from
>>vehicle movement is no longer present).
>****************************************************
>While I *used* to have my fan switch this way, I no longer have it wired
up
>like that now for other reasons. While I can see the logic, in that it
>WILL cool the radiator (and not much else when the engine stops running) I
>don't really see the *NECESSITY* for it. Granted there is a slight
>advantage in that it will help keep the water from boiling in the radiator
>but that's about it. <snip>
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