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Old 10-08-2010, 03:42 PM   #1 (permalink)
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Default A/C recharge - high and low pressure readings

Hey guys,

Can you tell me what the high and low pressure readings should be when recharging the a/c system. I have a 2003 Vulcan. I will do this probably on Sunday and the ambient temperature will about 80 degrees. Through searching this site and others there seems to be a range depending on certain variables like outside temperature so I am trying to understand how these readings are determined.

Any help would be greatly appreciated.

Thanks.
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Old 10-08-2010, 04:09 PM   #2 (permalink)
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80-90 degrees
Low side 19-39 psi
Hi side 140.235 psi
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Old 10-09-2010, 01:28 PM   #3 (permalink)
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from the 2005 Taurus shop manual:.

ambient temperature: 75, 80, 85, 90
suction pressure: 29-48, 32-52, 37-57, 41-63 psi
discharge press.: 140-240, 150-270, 170-280, 180-300 psi

19-39 seems a little low. I keep mine 50 or slightly lower. Like most of us I always recharge in the summer when cooling is most needed.

Measuring temperature (using both temp. and press.) is a better way but then you need thermocouples that most of us don't have. Here is a good article that you will explain the basic principle of AC maintenance. http://www.achrnews.com/Articles/Service_and_Maintenance/dd8d6a73c50ec010VgnVCM100000f932a8c0

With temperature info, recommended temperature range will get much narrower.
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