A/C Woes

[flaatr@yahoo.com (Euroroc II)]

There are two switches in the system on the hard pipe between the condenser 
dryer to the condenser that monitor pressure, a low pressure switch and a 
high switch. If the refrigerant pressure is too low the clutch will not 
turn on to protect the internal parts of the compressor and if the pressure 
gets too high the compressor shuts off to protect the whole system from 
bursting.

When you turn on the A/C does your idle change slightly (increase)? If yes 
then the system is trying to compensate for the load your compressor would 
introduce to the motor if it started. With the A/C on remove the wires from 
the low pressure switch (think it's the green top switch) and jumper them 
for a second to see if the clutch activates. Do not let the compressor run 
for too long if it does engage since your freon level is obviously low. If 
the compressor works with the jumper recharge the system.

If not check for loose connectors or other electrical opens.

-Raffi

At 04:57 PM 4/17/02 -0400, you wrote:

>         Of course now that its hot here in the North East the first thing 
> to break is the A/C. I turn the switch on and the fan comes on like it 
> supposed to, but I noticed the compressor doesn't kick in. Center part 
> isn't turning at all so apparently clutch is not doing its thing. I 
> unplugged the connector and cleaned it. It was a little dirty, tried once 
> again to cycle the a/c and still nothing from the compressor. Let it sit 
> running to see if it would turn on and yet still nothing. I then wondered 
> if perhaps it wasn't getting power, unplugged the connector on top again 
> and checked it with my test light and there was nothing there on either 
> prong. Should there be power here to tell the compressor the a/c has been 
> turned on or no? I know very little about the heating or cooling of the 
> car so I am pretty clueless, and that is why I asking the more 
> knowledgeable folk to see if I can't get this thing working again. Any 
> input is appreciated.
>
>Thanks,
>Chris
>
>
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