A/C Pressure Specs
06-26-2012, 01:49 AM
#2
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Join Date: 06-30-2010
Location: Kannapolis NC
Posts: 25,739
to the forum raj49!Sorry for the late reply on this, somehow I missed your post.
OK with an ambient temperature of 82 degrees, you should see the following, but since I don't know the relative humidity where you are I'll do all three pressure sets.
If the relative humidity is below 35%, you should see between 25-39 psi on the Low Side Service Port, and 183-238 psi on the High Side Service Port.
If the humidity falls between 35% and 50%, you should see between 25-41 psi on the Low Side Service Port, and 180-242 psi on the High Side Service Port.
If the humidity is above 50%, you should see between 30-45 psi on the Low Side Service Port, and 192-251 psi on the High Side Service Port.
With 31 psi on the Low Side and 149-151 on the High Side, it sounds like you're low on charge, or you have an issue with the compressor.
For your relative humidity, pull up the National Weather Service and look up your city, they list the relative humidity with the climate data.
06-26-2012, 05:05 AM
#3
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Join Date: 12-06-2009
Location: Alabama
Posts: 11,110
X2 on what Mike has said above.
My question to you is. Why were you checking the pressures? I'm assuming that you were having cooling output problems. If so, then it sure sounds like a low freon issue.
If you have a small leak,take a visual on the entire system. You might be able to spot a probable leak.(compressor oil leaves evidence sometimes)
My question to you is. Why were you checking the pressures? I'm assuming that you were having cooling output problems. If so, then it sure sounds like a low freon issue.
If you have a small leak,take a visual on the entire system. You might be able to spot a probable leak.(compressor oil leaves evidence sometimes)
06-26-2012, 02:36 PM
#4
Thread Starter
Join Date: 05-22-2012
Location: MI
Posts: 5
Thanks for the info 843!
I actually just replaced some parts and pulled a vacuum. I charged it with 1 12oz can and a bit more from another can but not all of it. I think capacity is 0.9lbs.
Guess i have to add more. I should have bought a scale.
I actually just replaced some parts and pulled a vacuum. I charged it with 1 12oz can and a bit more from another can but not all of it. I think capacity is 0.9lbs.
Guess i have to add more. I should have bought a scale.
06-26-2012, 02:41 PM
#5
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Join Date: 06-30-2010
Location: Kannapolis NC
Posts: 25,739
Yup the capacity is 0.9lbs.
Don't forget the PAG Oil.
If you replace the compressor you need to add 2.5 oz.
Condenser replacement requires adding .75 oz.
Evaporator replacement requires adding .75 oz.
And if you had a sudden dump of system pressure and loss of coolant, you need to add 2 oz.
Total system oil capacity is 5 oz.
Don't forget the PAG Oil.
If you replace the compressor you need to add 2.5 oz.
Condenser replacement requires adding .75 oz.
Evaporator replacement requires adding .75 oz.
And if you had a sudden dump of system pressure and loss of coolant, you need to add 2 oz.
Total system oil capacity is 5 oz.
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