Re: After-run relay diagnostics

[DeWitt Harrison <de@aztek.com>]

On Fri, 30 May 1997 12:10:03 -0500,  Luis Marques wrote:

>All this talk about sensors and senders prompted me to do some snooping
>around the wiring in my car ('87 4kcsq) and I discovered that, in fact,
>it had the after-run feature for the radiator fan.  I had never seen it
>in action, so i decided to investigate.
>[ ... ]
>It turns out that there was nothing wrong with my relay!  It just wasn't
>getting battery power in pin 30.  This pin feeds to a 4mm red wire that
>is connected to a bus under the fuse panel that is connected directly to
>the battery.  I connected this big wire back into the bus and presto!
>the relay works again.  Now the only thing left to do is find out if the
>after run switch is good or bad, since I have yet to hear the fan after
>shutting off the engine.  Either the engine hasn't gotten warm enough to
>trigger this switch, or it has failed open.  Does anybody know how often
>these switches fail? 

If you are not the original owner, be alert to the possibility that
someone disconnected this circuit to avoid having to deal with
some other maintenance issue.

DeWitt Harrison   de@aztek.com
Boulder, CO
88 5kcstq (Testing out-of-favor optimized intake flow idea. First
                 impression: it rocks!)