RE: rpm's shot up w/defogger on?

["Neal Tovsen" <ntovsen@piper.hamline.edu>]

This makes complete sense. My black car, which presumably doesn't have any
freon, has the high-rpm problem (mine usually hits about 1900, but not all
the time). I was just running my red (summer) car with working a/c last
night after I successfully got my motor mount in (YEAH!!!), and the idle
stayed roughly the same with the a/c on, though you could hear that the
engine was under more load from the compressor.

I had assumed that whatever bumps the idle with the a/c would be connected
with whatever senses the freon levels. Thus, the engine wouldn't bump the
idle up if the compressor didn't engage. It makes sense that this was an
incorrect assumption.

Neal

> -----Original Message-----
> From: Majordomo [mailto:majord@neubayern.net]On Behalf Of
> Chris Coracini
> Sent: Tuesday, February 16, 1999 11:25 AM
> To: 'Neal Tovsen'; Rich Zuk; Scirocco-L
> Subject: RE: rpm's shot up w/defogger on?
>
>
> it could be that your compressor is not engaging.  i took the
> A/C out of
> mine, but when i use defrost, the rpms go up to 1500, because
> the engine
> is not loaded by the compressor but the idle compensation thingy still
> does it's thing.  so next time it shoots up like that, go
> check and see
> if the compressor is engaged.  (you can tell because the
> inside will be
> turning.  if it isn't engaged, the inside will be static while the
> outside turns.)  it could be low on freon or have a bad connection
> somewhere...
>
> chris
> 86 16V scirocco
>
> > -----Original Message-----
> > From:	Neal Tovsen [SMTP:ntovsen@piper.hamline.edu]
> > Sent:	Saturday, February 13, 1999 2:23 AM
> > To:	Rich Zuk; Scirocco-L
> > Subject:	RE: rpm's shot up w/defogger on?
> >
> > Your a/c compressor should come on with the defrost. A lot of cars
> > with a/c do this, 'cause the a/c takes moisture out of the
> air making
> > the defroster more effective. Supposedly, if your a/c isn'
> t charged,
> > it's supposed to recognize this and not turn the compressor on, but
> > maybe there's something else that still requires more vacuum and/or
> > more elect. current?? My 87 would seem to be out of charge, too, but
> > it does the same thing.
> >  
> > Neal
> >
> > 	-----Original Message-----
> > 	From: Majordomo [mailto:majord@neubayern.net]On Behalf Of Rich
> > Zuk
> > 	Sent: Friday, February 12, 1999 11:00 PM
> > 	To: Scirocco List
> > 	Subject: rpm's shot up w/defogger on?
> >
> >
> > 	88 16V
> > 	I turned on the front defrost/defogger to get rid of fogged
> > windows, not the heat, and the rpms went from idle 900 to 1800rpms
> > constant.   What's this all about?  I turn it to heat, it's okay. 
> > Back to defrost, the idle went shooting up again.  The car does have
> > a/c, but most likely not charged.   All was fine before.  First time
> > this happened.   TIA
> > 	 
> > 	Peace
> > 	Rich Z
> > 	88 16V
> >
>
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