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I Got Cocky And Now No Air

Bench on Sun July 18, 2010 7:22 PM User is offlineView users profile

Year: 2001
Make: toyota
Model: tundra
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

fonebone on Sun July 18, 2010 7:51 PM User is offline

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!

Bench on Sun July 18, 2010 8:03 PM User is offlineView users profile

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.

thnaks

Bench on Mon July 19, 2010 5:55 PM User is offlineView users profile

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
Humidity 75%
Low side 42
High side 230

Thanks again.

TRB on Mon July 19, 2010 6:04 PM User is offlineView users profile

Bench, most site glasses will never clear with R134a.

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Bench on Mon July 19, 2010 6:22 PM User is offlineView users profile

HMMMMMMMMMMMMMMMM. so what does my clear site glass mean.

Cussboy on Mon July 19, 2010 6:36 PM User is offline

Quote
Originally posted by: Bench
HMMMMMMMMMMMMMMMM. so what does my clear site glass mean.

Disregard the sight glass. If your system is cooling well, that's what you want.


"Don't fix what's not broken !!!"

Bench on Mon July 19, 2010 6:50 PM User is offlineView users profile

No, it is cooling great. The gauges are the ultimate decision maker, right?

Is the lower the low side, better for cooling? And i guess that depends on ambient temp and humidity .

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