Air from Central AC not cold enough

______________________________________________________________________ The temperature of air blows out from the vent is about 72 when the room temperature is 80 and the outsite temp is 90+. No matter how long the AC is on, the room temperature will never go down further. I called a local AC service company and they came here and tested the compressor. The high pressure was about 200 and low was 80-90. They turned off the Freon line and the high pressure became 0, but the low pressure remained at 10. . I was told the compressor needed to be replaced as the high pressure should be higher and low pressure should be lower. The compressor was replaced 3 years ago. Can you please give me a second opinion? Thanks John [this message was edited by yunshi on Wed 14 Jul 10:41] Replies: streeter “Re(1):Air from Central AC not cold enough” , posted Sat 17 Jul 21:57: ______________________________________________________________________ Xenos, I apologize for standing on your post but this post is so absurd I needed the text for reference. “They turned off the Freon line and the high pressure became 0, but the low pressure remained at 10. . I was told the compressor needed to be replaced as the high pressure should be higher and low pressure should be lower.” What is this tech checking for? Is he shutting the liquid port off and then complains that his guages go to zero? How can there be any pressure to his guages when he has shut the port off? He has evacuated the system with the compressor. The fact that he evacuated the system proves the compressor valves. The fact that his guages don’t climb proves the schrader seals. This is scary because I don’t understand the post unless he is being blatantly ripped off. [this message was edited by streeter on Sat 17 Jul 21:58] Xenos Webmaster “Re(2):Air from Central AC not cold enough” , posted Sun 18 Jul 09:24 ______________________________________________________________________ I assumed they were checking to see if it would enter a vacuum and the best it would do was 10, as far as the post, a man of your caliber can step on me anytime. Xenos. The best way to escape a problem is to solve it. Xenos Webmaster “Re(1):Air from Central AC not cold enough” , posted Wed 14 Jul 15:14 ______________________________________________________________________ What your saying, does sound corect. Xenos. The best way to escape a problem is to solve it. streeter “Re(2):Air from Central AC not cold enough” , posted Sun 18 Jul 17:16 ______________________________________________________________________ Geez you embarrass me :) You seem to hold your own here just fine. Its just that the board does not allow you to see the original post your responding to and I don’t want to quote something from memory. Well that is all fine and good up until the poster says “the high pressure should be higher and the low pressure should be lower. How can the high pressure be any more than the low pressure when you’re drawing it into the condensor? The guages read lineset pressure. Either the poster is wrong about his post or the tech thinks by closing the high side he will build pressure. Which he is but he can’t see it because his guage is now isolated by the closed valve. Or he is ripping the customer off. Also, he could shut that low valve off anywhere and say it should be higher. I do this anytime I lose a core. I will pull the system down(into condensor) to 10psi and lock the low valve. Note: this is when my core removal tool doesn’t want to do the job, which seems like more than once. When that thing works its slick but when it don’t its a royal pain. Anyways, I will pull the lineset to 10psi and then get the guages out of the way and remove the core when I can see what the H is going on. This way I don’t have to mess with a pump down. If I get into trouble and see the guages going sub 10, I slap a cap on it and let a small rebuild in the lineset again. I have only had to rebuild the 10psi once. If he shut the low side off his comments don’t make sense either. So, whatever the poster means “he shut the freon line off” needs to be defined. In the post, the unit seems to be working ok by the pressures he mentions. 80-90 (weird its fluctuating unless air maybe) and 200. The fact he has only 8 across the coil(as far as he can tell) doesn’t look good but that is probably internal. Hope he comes back and explains himself, cuz it looks fishy. Otherwise how things been going? Been kinda cool here, picked up a developement keeping me busy, might be into a 10k ft^2 church which will take a bit of time. Replacing 750K btu’s and adding A/c.

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