OK NEXT

[Henry A Harper III]

On Friday, March 15, 2002 2:26 PM, steveb [SMTP:steveb at sabolrice.com] 
wrote:
> 	My isv seems to be ok know but, when the car has ran just sitting
> there it of course gets hot when the fan kicks on there is a serious load
> and the car goes from idle at 800 rpm to half that then back up is this
> normal. Or do I need to change something.

Is that the stage 3 (hurricane-mode, almost overheated, get some air moving 
NOW) fan kicking in, or the normal everyday sitting-in-traffic cooling-off 
stage 2? The idle on mine drops a bit when stage 2 first comes on, but I 
don't think it goes down all the way to 400rpm...and I can't really tell 
when stage 1 (running the A/C) fan starts unless it is 
stage-1-as-afterrun-engine-off. I would imagine that stage 3 startup might 
drop the idle more than stage 2 startup, but I don't think mine has ever 
gone to stage 3.

I'm sure there are diagnostics in the Bentley or at 
http://www.sjmautotechnik.com if you want to check your fan thermoswitch to 
see if you are getting stage 2 or stage 3...perhaps 
http://www.sjmautotechnik.com/cooling.html#fan would be helpful.

HTH
Henry Harper
http://www.henry-harper.com hah at alumni.rice.edu
1991 200 quattro, 115k, and what am I going to do about A/C this summer?
1988 GTI 16v, 225k, ditto for this car...grrr