Engine Size: 4.7
Refrigerant Type: r134
Ambient Temp: 97
Pressure Low: 18
Pressure High: 140
Country of Origin: United States
My stuff was blowing 50 degrees yesterday at the vent, and today it was blowing 60. Yesterday the low side was about 36 and the high was 160. I know that I am not supposed to add r134 without draining the system, but no, I thought, what would a few ounces hurt to clear up sight glass that looked foamy.
Now I have 80 degree vent temp. So tomorrow I will recover, vacuum, and put 2 cans in and call it done.
Do I need to replace the dryer?
And which is better, putting the r134 in the low/sucking side with engine running, or high side with engine off?
Yep, school of hard knocks.
Edited: Mon July 19, 2010 at 5:48 PM by Bench
Hi Bench- You did have, before adding, a 47 degree difference in temperature. That was not too shabby for that ambient temp. My guess is that you were a just couple of ounces low, and that you added a bit too much. If you would have had gages hooked up, you would have been able to analyze the system better. Now I'm sure you are a bit overcharged, and that will cause the vent temps to go up and pressures to climb. No, you will not have to replace the drier if the system was not opened. Proper way of course is to evacuate and add EXACTLY what the sticker under the hood calls for. Hope this helps!
Thanks fonebone. The first can I put in yesterday, I made the mistake and thought it was empty, but it was not, so that is where my extra couple of ounces went. I'll get it right tomorrow.
I nailed it this time. Thanks for putting up with a new guy. I put a vacuum on it for 30 minutes, turned off vacuum pump for 10 minutes, and low side did not move. I put another 15 minutes of vacuum on it, and then added two cans. The sight glass is clear as a bell.
Can't thank everyone enough for their help. I have always been mystified by A/C systems, but now I know it is all in the details.
Vent temp 46 degrees
Ambient temp 97 degress
Low side 42
High side 230
Bench, most site glasses will never clear with R134a.
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