Question about 1999 Chevrolet Silverado 1500

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Trying to add freon to my 99 gmc sierra, as i add freon i hear the compressor start to come on but turns off after a few seconds,still dosnt get cold

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The compressor cutting and out is a good sign that the system is trying to work. Usually when the compressor cuts in and out after a few seconds, it means that the system is not fully charged and more refrigerant is needed. It's a good idea to purchase a gauge that measures the amount of charge in the system. The gauge looks like an air gauge, and they are not very expensive. That way you will know how much more of a charge the system needs. The gauge hooks up to the low pressure valve, just as the charge hose does.

Posted on Jul 02, 2009

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It is probably terminated by the pressure switch .unfortunatley this is a high/low switch so it could be bad thing as that switch will cut off on high at 350+ lbs. overcharge and excessive head pressure is a result of too much freon. gauges reading both high and low values is highly recomended.In the event it is low pressure signal during recharging , unplug that switch on the big reciever and bypass it with a jumper and it will continue to run and accept the freon in a timely manner and not short cycle compressor

Posted on Jul 02, 2009

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Chevyburb is right, only thing to really know what’s going on is to have both side gauges, because it's a 1999 I would guess you have had refrigerant permeates threw the rubber hoses. I would suspect from my experience that you have an orifice tube plugged or a dryer that has a blown desiccant bag. That’s why adding more to it is not making it get cold. You also need to charge it when it is cooler in the morning or run water on the condenser while charging. If it does not want to take a charge you may have a plug somewhere. You also need to shake the can as you add it to the system if you don't a slug of refrigerant could damage the compressor.

Posted on Jul 02, 2009

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