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Recharging A/C but pressure is low

Kolbergk on Sun March 30, 2008 12:11 PM User is offline

Year: 1992
Model: Accord
Engine Size: 2.2
Refrigerant Type: 134a
Ambient Temp: 75
Pressure Low: 17
Pressure High: 110
Country of Origin: United States

Hello, I just replaces the evaporator and the dryer/accumulator. vacuumed out the system and started putting in 134a. The first can was slow to go in. Used the warm water trick. Second can is even slower. Compressor is kicking in but the pressures are low. 17 psi and 110 psi. What do you think?
The compressor sounds fine. The system was clean as can be when I had the evaporator out. But do you think this compressor is dead? Thanks!
Ken Kolberg, Orlando FL.

Kolbergk on Sun March 30, 2008 12:36 PM User is offline

Update. I went back out and the dryer was leaking oil onto the floor. I tightened that fitting. I had added oil to the dryer before installing it. I forgot to add oil to the evaporator. The sight glass at the top of the dryer is all foamy. The second can is gone, but there was that leak at the dryer. My pressures now stand at 26 on the low side and 145 on the high side. Water is coming off the evaporator but the air isn't cool. Any thoughts? Thanks. Ken

mhfd112 on Sun March 30, 2008 2:26 PM User is offline

If there was a lose connection you may have air in the system.

Kolbergk on Sun March 30, 2008 5:04 PM User is offline

I had let it sit for a half hour with vacuum and it held. The dryer fitting must have loosened up while it was charging? But I will vacuum it again and re-charge (after I buy more 134a). Thanks, Ken

mk378 on Sun March 30, 2008 6:58 PM User is offline

Make sure it has really stopped leaking. Clean all the the oil off so you can see if more comes out. While there is still pressure in the system, put soapy water on the connection and look for bubbles. On these connections the o-ring makes the seal and unless the nut is super loose, it really doesn't matter how tight it is. Somewhat beyond hand tight is plenty.

it doesn't matter where you added the oil, it circulates around. The total amount in the system needs to be correct.

When you get water from the evaporator drain, the air should be at least a little cool. Those pressures look about right for at idle with 75 ambient. Is the low side line cold and sweating? There may be a reheating issue where the air goes thru the heater core and gets reheated before it reaches the vents.

Kolbergk on Sun April 06, 2008 3:15 PM User is offline

(one week later) I'm back at it again. I've got the vacuum pump running now. I will check it for leaks (lose vacuum) and charge it again.

Kolbergk on Sun April 06, 2008 5:37 PM User is offline

Added 134a, about 2 and a half cans. The sight glass is clear! Pressures at idle are 40 and 175psi. The temp is about 80 out. Vent temps remained at about 80 degrees until I started playing with the heater valve near the firewall. It appears to have been stuck part way open. It's closed now and when I took the car around the block, I got vent temps 40 to 43 degrees. It's rainy out today, so I hope that works as well when the summer heat kicks in. As always I am grateful for your support and expert advice. Thank-you, Ken

Cussboy on Sun April 06, 2008 5:37 PM User is offline

Since you have 1992, it likely was originally R-12. I believe after pulling/holding vacuum, you'll want to end up with pressures of maybe 30 on low and 220 on high side, and have maybe 80% the ounces of R-134a that were originally called for with the R-12.

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