Mk II Air Conditioning?

[amalventano1 at tds.net (Allyn)]

You might want to throw a set of gauges on there and monitor it while running before you go replacing pressure switches.  Also -
have you checked out the A/C control switch inside the car?  The left half of its range of motion actually dictates the cycle
frequency/time of the compressor, and it does this based on the temperature probe reading from the evaporator.  It could very well
be cycling because it is being told to, based on what it thinks the temp setting is.

Al
 

> -----Original Message-----
> From: Jim Jarrett [mailto:jarrett@rpa.net] 
> Sent: Wednesday, June 28, 2006 11:38 AM
> To: Dan Bubb
> Cc: scirocco-l@scirocco.org
> Subject: Re: Mk II Air Conditioning?
> 
> Quoting Dan Bubb <jdbubb@verizon.net>:
> 
> > I don't believe the pressure switches control the compressor. The 
> > thermostat controls compressor clutch on/off.
> 
> Ah!  This does seem to make sense.  And, you're not referring 
> to the coolant thermostat, correct?  Where's the a/c thermostate?
> 
> > There is a low pressure switch that prevents the compressor from 
> > running if the freon charge is too low to prevent damage to the 
> > compressor and there is a high pressure switch that turns on the 
> > radiator high speed fan once the high-side pressure is 
> above a certain point.
> > The pressure switches are not valved to my knowledge.
> > I can't see how the pressure switches, considering their relative 
> > functions can be responsible for compressor cycling, but don't have 
> > enough experience otherwise to suggest what might be 
> causing it other 
> > than, perhaps, a bad expansion valve. (the expansion valve 
> is always 
> > the problem unless you have a leak)
> 
> Ah.  And this also makes more sense.  Maybe John was 
> referring to the expansion valve.  On a Scirocco, where is this?
> 
> Thanks!
> 
> =================================================================
> | Jim Jarrett,McFarland, WI       2006 Golf GLS                 |
> | mailto:jarrett@rpa.net          81 Rabbit Convertible 16v     |
> |                                 88 Scirocco  16V              |
> |    Any problem can be solved with the proper application of   |
> |   Force, Heat, Chemicals, or Money.                           |
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