Question about 2003 Chevrolet Avalanche

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I am ready to charge the AC on my 2003 Avalanche. However, when I put the gauge on, turn on the AC, the guage reads overcharged until the compressor kicks on...when in goes to low... Is this normal? I have no AC, but do not want to overcharge. Please advise, Thx, Les

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Hi,

This is ok. This is normal. Even though check this article before you do an overcharge.

http://www.wikihow.com/Recharge-the-Air-Conditioner-in-a-Car

Let us know if you want to know something else accept the suggestion.
Thanks for contacting fixya.com

Posted on May 25, 2010

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You need a set of gauges to do it right (connected to high and low ports) then read this.
http://www.denlorstools.com/autoblog/2009/04/adding-freon-to-car-ac-gauge-readings-explained/

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You may not have enough R134a in the system, or you have over charged the system and your high pressure switch is turning your compressor off when the pressure get's to high.
You really need a A/C gauge set to see of your system is over or under charge. If it's under charge, that's good. A over charged system will cause your a costly repair of replacing a $300.00 rebuilt compressor plus the vacuuming out the system and replacing the accumulator which may have parts from the compressor (bearing).
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Don’t assume that if adding little Freon is good that adding a lot is better! Overcharging just a little can decrease the performance of the system and possibly damage the compressor, assuming the blower speed is on high, AC is set on maximum and engine is around 2,000 RPM’s

1. Check the high and low gauge readings with the AC on & set on MAX/Recirculate, middle vents with the engine at 2,000 RPM’s, blower speed on high.
2. Check the vent temperatures with a thermometer from the middle vents, far right & far left vents?
3. What is the outside temperature at the time the readings were taken? 4. Check to see if the condenser fan blowing strong?
5. Notice if compressor clutch is cylcling excessively.



Thank you for using fixya and good luck


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You may have over charged the system, An over charged system will also give you poor A/C performance and worst can lead to expensive repair if the compressor get's damaged.
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God luck and hope this helps. 

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