Cooling Fan comes on with ignition - '87 5kcstqw - fixed

[Swann, Benjamin R. (BSWANN)]

This was one of those, fix the most obvious culprit fixes. I replaced the
thermo switch in the radiator, and that fixed the problem.

Removel and replacement would have been easier if I had a deep 30mm socket.
Instead I had to remove the hoses, and the only thing I could get to grab it
was a large set of pliers.

Thanks to all who sent replies. 

> -----Original Message-----
> From:	Swann, Benjamin R.  (BSWANN) 
> Sent:	Wednesday, April 18, 2001 8:34 AM
> To:	'quattro at audifans.com'
> Subject:	Cooling Fan comes on with ignition - '87 5kcstqw
> 
> 
> This wierdness started just after I changed the coolant hose which goes
> from the turbo to the fitting on the freeze plug.  I don't see how this
> would be related, except maybe draining and refilling coolant during the
> operation has precipitated some sensor to be working incorrectly.
> 
> Symptoms - cooling fan comes on with ignition and stays on until ignition
> is shut off.  I think it is fan speed 2, but am not sure.  I can hear the
> fan running inside the car at idle.   I haven't verified if the fan comes
> on when stone cold.   I was looking at the Bentle wiring diagram, but did
> not see any direct correlation to ignition directly enabling any sensor to
> relay feeds from current track 15 or X track.
> 
> I topped off coolant to get any air out of the system, and even ran the
> afterrun pump in both directions several times.  Have already taken severa
> highway trips, so I don't think there could be any air in the system.
> There are no warning indicators, and the coolant temp doesn't even gets to
> max operating temperature - pretty much normal for this time of year.
> 
> Any BTDT on this.
> 
> TIA
> 
> Ben
> 
> '87 5kcstqw 
> '85 4kcsq