4kq fan after-run relay?

[Huw Powell]

> hhmm... my '88 90q radiator fan will run with the ignition off and key removed.  Can't remember if taking the key out will interrupt the fan, but it does run when I'm not around.  Why would the 4k be any different?

any number of reasons...

> Should my 4kq radiator fan continue to run after the key is removed from the
> ignition?  Currently, when the key is removed, the fan will shut off.
> Should it continue?  If so, what could be the reason it doesn't?

It will continue - or come on after a short delay - if the car has the
afterrun system.  I don't think all 4kq's have this.  The sensor is
mounted on a bracket mounted to the back of the head.  I once tested
Marc's for fun with a propane torch... heated the bracket up til the fan
came on!  With this system the fan is not running off the same sender,
so it could easily not "continue" to run.

I think I rewired my coupe fan to run off the radiator sender at any
time, by supplying the relay (or the sender, don't remember which it
was) with battery voltage instead of key-on voltage.

-- 
Huw Powell

http://www.humanspeakers.com/audi/

http://www.humanthoughts.org/