clicking radiator fan relay

[Bernie Benz]

Joe,
Sounds like maybe you are not talking of a 200-20V, but of a CFI injection
system car.  what are we dealing with here?

Bernie

> From: "Joseph Yakubik" <JYakubik at satx.rr.com>
> Date: Thu, 11 Sep 2003 21:23:25 -0500
> To: <200q20v at audifans.com>
> Subject: clicking radiator fan relay
>
> This is a multi-part message in MIME format.
> --
> [ Picked text/plain from multipart/alternative ]
> I've just sold my '91 200TQW and the radiator fan relay (#3 in the fuse box)
> has started cycling.  The buyer hasn't picked it up and I want to fix this
> before he does.
>
>
>
> Symptoms: rapidly cycling or clicking relay when the ignition is on (motor
> running or not) AND the A/C is off or ECON.  The fan also spins very slowly
> when this happens, so it is getting power from the cycling relay.  It didn't
> do this prior to my installing a new radiator fan yesterday.
>
>
>
> I've searched the archives and haven't found a solution I can use.
>
>
>
> Since the clicking stops when the A/C is on, I assume it's getting a cycling
> ground signal through the other leg of the circuit (turbo coolant pump
> control unit).  I thought I might have bumped a wire or a sensor during a
> radiator fan repair, so I double checked those sensors.  Observation: relay
> clicks with or without radiator cooling fan or turbo coolant pump temp
> sensors connected.  Fan & pump runs when sensors shorted, so I assume
> they're good since disconnecting them doesn't stop it, but shorting the
> circuit path makes the fan operate normally.
>
>
>
> I followed the circuit path in the Bentley and did some more troubleshooting
> after checking on-line.  There's a similar problem described here:
> http://www.audifans.com/archives/1998/03/msg03001.html
>
>
>
> Since it didn't appear to be the cooling pump, I followed up on the injector
> temp sensor side.  I can't find the specific wire/sensor mentioned on-line
> but after selectively pulling a few fuses, I've pretty much got it isolated
> to a problem on that side.  The clicking will stop if I pull either fuse 24,
> 27, or 28.  I assume this means there is some fault in the injector cooling
> circuitry or possibly the ECU.  I pulled the temp sensor wires (two-wire
> fitting) on the back of the passenger side of the block (Bentley says
> coolant temp sensor) but this didn't help.
>
>
>
> Any BTDT's?
>
>
>
> The car's going to the mechanic on Monday to get a new belt/water pump prior
> to its road trip.  I need to get this fixed soon.
>
>
>
> Joe Yakubik
>
> JYakubik at satx.rr.com
>
> About to be Audi-less after 9 years
>
>
>
> --
>
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