auxilary fan acting up

[robert weinberg]

Hi Phil,

unfortunately it's definitely your latter scenario. it's a new phenomenon as well.

could it be the relay or the thermal switch?

which relay is the correct one?:
http://www.autohausaz.com/search/product.aspx?sid=glgwwxybvewzgczqbpbh1nvk&makeid=800002@Audi&modelid=1007288@200%20QUATTRO%20TURBO&year=1991&cid=18@Electrical%20%26%20Vacuum&gid=3604@Relay


is this the switch you were saying was hard to replace but might be the culprit?

https://www.autohausaz.com/search/product.aspx?sid=bef0brnfxwwugcfd1eli3ovv&makeid=800002@Audi&modelid=1007288@200%20QUATTRO%20TURBO&year=1991&cid=16@Cooling%20System&gid=4768@Radiator/Auxiliary%20Fan%20Switch
on the bright side, my friend swapped the rack with a jorgen rebuild. and if you remember me complaining sometimes i felt i wasn't getting the full boost benefit of the car's dyno tuned 034 stage 1 chip? my friend also replaced the cap, rotor, wires and plugs. the plugs have been replaced before, but apparently the cap, rotor and wires WERE ORIGINAL! car has 119k on the clock.

the boost regularly throws you through the back window when you stab the gas now ;-)

see ya,
Robby




________________________________
 From: Phil Rose <pjrose at frontiernet.net>
To: robert weinberg <centaurus3200 at yahoo.com> 
Cc: 200q20V mailing list <200q20v at audifans.com> 
Sent: Wednesday, August 15, 2012 10:36 AM
Subject: Re: auxilary fan acting up
 
Robby,
That sounds OK to me--happens especially if the car is in motion (and being cooled). But if that very short intermittant running is happening on a hot day _while the car is idling_ and the fan shuts off --letting the temp climb well above the middle mark, then perhaps a problem. Might be a good idea to check the connector to the radiator temp sensor--maybe it's become corroded. As I recall, it's not easy to reach.

One way to check the fan is by operating the A/C (if it's still operational. I use mine rarely 'cause it's lost most of its freon over the past 21 years without a recharge!). AFAIR, the A/C should cause the fan to operate continuously on high speed.

Phil

At 10:30 AM -0700 8/13/12, robert weinberg wrote:
> hi all,
> 
> the last few times i drove the car, the aux fan kicks in at the usual point on the temp gauge BUT it only stays on for like a second or two, then turns of, then turns on a again for a few seconds, and so on.
> 
> is this the symptom of a failing temp relay (what's that thing called again?)
> 
> Regards,
> Robby
> _______________________________________________
> 200q20v mailing list     http://www.audifans.com/mailman/listinfo/200q20v


-- 
Phil Rose.....Rochester, NY USA
'06 A3q 3.2 V6 (20K, silver)
'91 200q    (165K, Lago blue)
Gone to Audi Valhalla:
'91 200q   (Tornado red)
'89 100 (Bamboo gold)