Automotive Air Conditioning Information Forum (Archives)

Provided by www.ACkits.com

We've updated our forums!
Click here to visit the new forum

Archive Home

Search Auto AC Forum Archives

recharging

shugninx on Sun August 16, 2009 2:16 AM User is offlineView users profile

Year: 1995
Make: honda
Model: civic
Engine Size: 4 cyl
Refrigerant Type: r134
Ambient Temp: 84
Pressure Low: 65
Pressure High: 150
Country of Origin: United States

What would cause the refrigerant to take a long time to leave the canister on a recharge?

Chick on Sun August 16, 2009 7:41 AM User is offlineView users profile

Did you pull a deep vacuum? if so, the vacuum should pull it in fast, then if not, you might not be depressing the shrader valve fully..

-------------------------
Chick
Email: Chick

---------------------------------------------

Freedoms just another word for nothing left to lose

NickD on Sun August 16, 2009 8:05 AM User is offline

Left off the ambient temperature, with a low side of 65 psi, and an ambient temperature of say 65*F, the pressure inside the can would only be 64 psi, the pressure inside the can has to be much larger for gas to flow from it. At 75*F ambient, can pressure will increase to about 79 psi, but still not enough as your low side gauge is reading average pressure, not those high peaks present in any pulse type system, so the refrigerant can be shifting back and forth between the can and and your system.

This is all basic physics, for refrigerant to flow from the can to the system, it's pressure has to be much greater. Best to pressure charge on a 85*F day starting off with a cold engine.

shugninx on Sun August 16, 2009 9:47 AM User is offlineView users profile

I pulled what i assume was a deep vacuum using a 3 cfm vacuum pump which claims to pull down to 25 microns and purged the line before opening the system.

shugninx on Sun August 16, 2009 9:49 AM User is offlineView users profile

Ambient temp was 84.It took about 30 minutes just to get half the can in.

Voyager97 on Sun August 16, 2009 11:04 AM User is offlineView users profile

Warm up the can.

Stand it in a bowl of hot(ish) water, or use a hairdryer. Don't even think about using a blowtorch, or you'll be picking bits of tin can out of your eyeballs !


-------------------------
Vic @ Pennine AutoChill

NickD on Sun August 16, 2009 1:03 PM User is offline

I am beginning to think with that high low side pressure, the ambient temperature, either have a worn compressor with low differential pressure or a restriction in your TXV. The numbers are not adding up. Low side starts off very low, or should, then build up to around 27 psi. You should also have a sight glass, what does that look like?

knightgang on Sun August 16, 2009 3:05 PM User is offline

Quote
Originally posted by: Voyager97
Warm up the can.



Stand it in a bowl of hot(ish) water, or use a hairdryer. Don't even think about using a blowtorch, or you'll be picking bits of tin can out of your eyeballs !

I do hope this information was not obtained from personal experience...

knightgang on Sun August 16, 2009 3:07 PM User is offline

Quote
Originally posted by: NickD
I am beginning to think with that high low side pressure, the ambient temperature, either have a worn compressor with low differential pressure or a restriction in your TXV. The numbers are not adding up. Low side starts off very low, or should, then build up to around 27 psi. You should also have a sight glass, what does that look like?

I did not think there were sight glasses in 134 systems. Never been one on cars I have had with 134... I could be wrong on some models...

Back to Automotive Air Conditioning Forum

We've updated our forums!
Click here to visit the new forum

Archive Home

Copyright © 2016 Arizona Mobile Air Inc.