AC Pressure discrepancy?
09-04-2012, 07:22 PM
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AC Pressure discrepancy?
I bought a bottle of EZ Chill and followed the chart on the bottle (which I am now thinking was a mistake) and it claimed at the temperature I was working in, the low side should be 50-55 psi. I couldnt get the pressure that high and so I opened the book to my '99 infiniti i30 and found that there is a completely different chart in the book and it claims that the pressure should only be 22-27 psi. which should I believe???
09-04-2012, 09:22 PM
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Well the A/C hasn't worked since I bought the car last summer. I just now decided to start trying to fix it since more serious problems have been fixed. The pressure was 44 psi. The can said at 95 degrees, it should be 50-55 psi. I thought, well hopefully this is my problem. So i put some in, no change. added some more, no change. I kept adding the refrigerant and the psi would jump when i was adding it, but if I stopped to see what the pressure was, it would always fall back to 44 psi. I ended up using the entire can without any change. Then in my search for why a whole can wouldn't raise the pressure by even 1, I ended up opening the book for my car to see what it recommended. and it says that at a temp of 95 degrees the psi should be 23-27. now there are a few other conditions, all of which were met except for the RPMs. The book says the RPM should be at 1500 when measuring, but my car idles at about 900-1000.
When I read the book's recommendation, I let out 20 pounds of pressure for fear that it was overcharged. and the gauge reflected that change, so it wasnt like the gauge was stuck on 44
tomorrow, I'll bring the pressure up to 40. I need to get a gauge to stick on the high side, I am beginning to suspect a blockage, but I need to read the High side to know. But if the book was wrong about the low side's pressure, I am not sure if I can trust its high side pressure... unless the fact that my RPMs were half of what they should have been has everything to do with the pressure not reading what the book says it should have been
When I read the book's recommendation, I let out 20 pounds of pressure for fear that it was overcharged. and the gauge reflected that change, so it wasnt like the gauge was stuck on 44
tomorrow, I'll bring the pressure up to 40. I need to get a gauge to stick on the high side, I am beginning to suspect a blockage, but I need to read the High side to know. But if the book was wrong about the low side's pressure, I am not sure if I can trust its high side pressure... unless the fact that my RPMs were half of what they should have been has everything to do with the pressure not reading what the book says it should have been
Last edited by grandpa2390; 09-04-2012 at 09:26 PM.
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