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Old 06-21-2011, 11:05 PM
LeTempt LeTempt is offline
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Join Date: Jun 2011
Location: Alabama
Posts: 2
Gender: Male
Vehicle: 2002 Dodge Ram
Trim Level: SLT
Color: Blue
Engine: 2002-2007 287ci (4.7L) PowerTech V8 235hp 295lb/ft
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Default Air Conditioner Pressure Specifications

I have a 2002 Ram 1500 w/4.7L engine. Air conditioner cools ok, but does not seem to get quite as cold as it used has been really hot in AL. Stopped by Harbor Freight the other day and they had a manifold gauge set for $39 and used a 20% off coupon. One of those tools that I will probably only use once every few years, but for about $30 I might check my a/c system pressure (and my friends) every year. My (Chilton) repair manual does not include a/c pressure specifications. Have seen some generic tables online based on the outside ambient temperature. Assuming it will be 90-100 degrees when I test my system pressures, it looks like the low pressure side should be 25-43 psi and the high side should be 165-270 psi. I have seen other charts that say 30-40 psi on the low side and about 2.2-2.5 times the ambient temperature on the high side. Wondering if anyone knows the specific pressure ranges for my Ram. Thanks in advance.

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