Re: [DML] Blue Fan Fail Module

["DMC Joe" <dmcjoe@xxxx>]

Richard,

As an electronic technician you will notice by my description that the Fan
Fail Module is a relatively simple device. If you have a workshop manual go
to M:18:19, the entire cooling fan circuit is located at the upper right of
the schematic wiring diagram.

The design concept of the Fan Fail relay is nothing more than a device that
would sense excessive current draw from one of the two cooling fans and
switch on the "Fan Fail" warning light to inform the driver of a possible
problem with one of the cooling fans. It is normal for the warning lamp to
illuminate for a second or two whenever the fans switch on. There are two
problems with the relay and the circuit design.

Problem one: the 12v supply for both fans go through the relay.
Problem two: the cooling fan current draw exceeds the current rating of the
relay.
Result: the relay will eventually overheat and melt down. When this happens
not only does the Fan Fail warning light cease to operate, so do the cooling
fans. This could lead to engine overheating possibly causing permanent
damage to the engine block.

There are several temporary fixes but the best and easiest to install item
is the
Fanzilla.

"We're here to help you"

DMC Help / De Lorean Services / <dmchelp@xxxx>
Web Site: <www.deloreanservices.com>
.

----- Original Message -----
From: Richard W. Schauer <rws@xxxx>
To: <dmcnews@xxxxxxxxxxx>
Sent: Tuesday, July 18, 2000 5:29 PM
Subject: [DML] Blue Fan Fail Module


> Hi all,
> I'm getting to know my car better (it's been 8 days now) and one thing I
> noticed is that I still have the blue Pektron fan fail module
> installed. Whenever my fans come on, the light comes on too.
> 1.) Would this more likely be a fan problem or a module problem? (I think
> I know the answer to this)
> 2.) In what manner does the module fail? Does the light stay on when the
> fans are running, or do the fans come on all the time, or not at all, or
> what?
> 3.) I'm an electronic technician in real life, and I can't imagine that
> the electronics in this module that's smaller than an egg can be that
> complicated. Has anyone ever fixed one? What's in it?
> 4.) If it does fail interminably, where does the 3-legged jumper wire go
> exactly?
>
> Thanks,
> Richard Schauer
> #4411
>