Cooling fan is constantly on Chrysler Voyager LE ...HELP !

Got a problem with my Voyager (its an R reg 1998)
The cooling fan is constantly running even when keys have been removed
from ignition. I think it’s the relay switch and have had an
electrical enginner out to look at it. He’s never worked on a Chrysler
before so it was all new. He looked through manual and even on
internet , stripped the car out to get to radiator / fan to locate
this relay switch but he cant find nothng. He said it may have to be
done by computor in which case it’s gonna cost me big time.
So question is, does anyone know where to locate the relay switch or
does it not actually exist ?
Please help,,,, destressed mum of 5 who needs her minivan !
Cath x

 

http://www.AutoBoardz.com/Cooling-fan-constantly-Chrysler-Voyager-LE-HELP-ftopict248655.html

The fan relay module is located just under the battery on the frame rail.
There was a recall out to have this part replaced in May of 1998, has yours
been done?

Glenn Beasley
Chrysler Tech

 

I'm still not sure why they call it a relay in the first place. It is a
transistor (probably a FET of some kind) that the computer pulses to PWM the
power to the fan motor for variable speed. In the OP's case the FET simply
failed shorted (on) which they are known to do.

 

As happens sometimes as new technology evolves, the terminology can
sometimes get muddy (examples: A valve lifter is technically not the
same as valve lash adjuster, but out of habit for a part whose purpose
is similar but not exactly the same, they are referred to as lifters,
even though technically that's inaccurate. Also - the steering knuckle
on today's front wheel drive cars does not have a spindle, yet, again,
out of habit, people sometimes refer to the steering knuckles on our
cars as spindles. Also - up until 5 years ago, there was a distinct
difference in the meaning of the words "generator" and "alternator" in
the context of cars. Yet, the official term used by SAE and the
manufacturers in their documentation (FSM's, etc.) for the thing you and
I have always referred to as an alternator is now "generator").

In the world of electronics, when a manufactured module has the same
function as an old-school relay (low current input used to control a
large current output), but is comprised of electronics instead of
electro-mechanical components, the resulting device is often referred to
and marketed as "a solid state relay". So in that regard, it could just
be called a relay, and often is as in this case.

Bill Putney
(To reply by e-mail, replace the last letter of the alphabet in my
address with the letter 'x')