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Does AC dye boil off during evac. process?

lv6l on Thu July 02, 2009 4:09 PM User is offline

Year: 1994
Make: Honda
Model: Civic
Engine Size: 1.6
Refrigerant Type: r134a
Ambient Temp: 85

Hi, my ac system has currently PAG 46 oil in the compressor and a green dye that the ac shop pumped in when I had my last charge. I am planning to recharge the system and during evacuation process is the dye going to boil away or am I going to have to physically take the hose out and drain all of it? Can I leave the dye in there with no effect to ac performance? Should I change the PAG 46 oil too? I did a clean line and compressor flush with ac flush fluid a year ago and refill the correct amount of PAG 46 oil. The system is running fine with no leaks. Only reason I'm recharging it is because the first time I charged it I was careless and did not allow it to reach -29 pressure. I got it before to about -23ish. The ac is blowing cold but takes a while and on very warm to hot days it takes a long time. Regular days it will get down to to 46f vent temp. On long drives and tinkering with the fan speed I might be able to get it to 44F vent temp but nothing lower. Thanks in advance for any inputs.

mk378 on Thu July 02, 2009 4:18 PM User is offline

Dye lives in the oil. It does not go away unless you flush and replace with new oil.

lv6l on Thu July 02, 2009 5:50 PM User is offline

Oh? Should I flush it out and replace? If I leave it in there will it effect the performance of the AC?

HVargas on Thu July 02, 2009 6:39 PM User is offlineView users profile

You can leave the dye in there. It will not hinder the performance. Not pulling a good long vacuum to boil off any moisture will. Evacuate all of the freon, pull into a vacuum for a good 30 minute's and then recharge with the proper amount. No need to add oil as it does not boil out when placed in a vacuum.

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Edited: Thu July 02, 2009 at 6:39 PM by HVargas

lv6l on Fri July 03, 2009 6:39 PM User is offline

Oh, Thank you very much for your input. This forum has such great quick reply times.

lv6l on Sun July 05, 2009 5:46 AM User is offline

Okay, here is my store. I let out my old freon, used an AC vacuum pump to evacuate the system. I let the pump pull for about 5 min, let sit for 10 min. I then repeat until I see the low side gauge stayed at -29. I then pull for 10 more min. and let it sit for 30 min. I came back, nothing has changed. I then connect the yellow hose to a can tap, I bleed the yellow hose at the neck near the manifold, I slowly open the low side. Everything was going fine until when the first can was almost empty I notice freon was slightly leaking out from the neck of the yellow hose at the can tap end. I quickly tighten it.

Question now is, could this have let in air that my -29 pressure is pretty much gone and useless? I am currently getting a reading of 41F. I guess it's fine with me; I'll live, it gets the cabin pretty cool, but I was wondering could I have gotten it even colder if I never had that issue I mentioned. When doing auto AC what is a normal temperature OEM is at?

Thanks.

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