> Howdy!
 > 
 > A friend has a 1986 Ford Crown Vic in which the factory Air Conditioning 
 > Compressor cools things just fine.  But it also has a frequent on/off, 
 > on/off,on/off cycling of the compressor.  Obviously this isn't good for the 
 > electric clutch stuff on the compressor.  What is a 'normal' cause of this 
 > constant on/off compressor action?

I'm not 100% sure, but have heard that there are high and low pressure
sensors that "protect" the compressor from burning up by shutting
it off if it thinks there is low R134a in the system.  

My best guess would be either it is low on R134a (but if it is blowing
cold, that probably isn't the case), or one of the sensors is thinking it
is low and cycling it.  It can also be a slight clog in the system causing
too much pressure.

- Mark

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